**Node, TypeScript, React Developer | £70,000 - £84,000** We're working with one of the UK's leading business services providers on this exciting opportunity. This is a high-impact role for a Senior Software Engineer ready to lead a massive technical transformation. You will play a pivotal part in re-platforming a high-traffic system, moving away from legacy Drupal architecture toward a modern, scalable stack built on TypeScript, Node.js, and React. **The Role**

*   Lead the charge in modernising and scaling the platform through a full-scale migration from Drupal to a modern JavaScript ecosystem.
*   Build robust, scalable applications and microservices using Node.js and TypeScript following clean architecture principles.
*   Contribute to diverse backend services and APIs, gaining exposure to existing Python (Django/Flask) and Laravel environments.
*   Collaborate cross-functionally with Product, UX, and DevOps teams to deliver seamless user experiences and high-performance infrastructure.
*   Drive best practices in coding standards, testing, and CI/CD deployment workflows.

**What You'll Need**

*   6-8+ years of commercial experience in software development with a heavy focus on Node.js, JavaScript, and TypeScript.
*   Proven expertise with modern front-end frameworks, specifically React or Vue.js, to build responsive UIs.
*   Previous experience or exposure to Python (Django/Flask) or PHP (Laravel) is highly advantageous for full-stack versatility.
*   A strong understanding of API design and a background working with CMS migrations (knowledge of Drupal is a massive plus).
*   A mindset geared towards scalability, performance optimization, and architectural excellence.

**What's On Offer**

*   Competitive salary package (£70k - £84k) plus a comprehensive benefits suite.
*   Remote-friendly working environment that prioritises work-life balance and flexibility.
*   A supportive culture that actively invests in your professional growth and continuous learning.
*   The opportunity to work on a large-scale digital transformation project with tangible business impact.

**Apply via Haystack today!**

Senior Software Engineer

**Web Developer | £35,000 - £45,000** We're working with a rapidly expanding digital platform specialist on this exciting opportunity. Join a high-performing development team at the heart of an innovative, growing platform where you will take ownership of modern web applications. This is a chance to leverage your expertise in Vue.js and React to build scalable features and enhance high-traffic systems within a collaborative, forward-thinking environment. **The Role**

*   Lead the development and maintenance of dynamic, high-performance web applications using modern JavaScript frameworks.
*   Drive the creation of new features and critical internal tools to support a growing global user base.
*   Collaborate directly with client services to provide rapid issue resolution and optimize live environments.
*   Actively contribute to technical specifications, code reviews, and the evolution of development best practices.
*   Work across the full software development lifecycle to deliver clean, maintainable, and efficient code.

**What You'll Need**

*   At least 2+ years of professional experience with JavaScript frameworks, with a strong preference for Vue.js or React.
*   Deep technical proficiency in core web technologies including HTML5, CSS3, and SQL for database management.
*   Familiarity or exposure to backend technologies and tools such as Node.js, PHP, or ElasticSearch would be highly advantageous.
*   Hands-on experience with version control (Git) and working within a Linux CLI environment.
*   A proactive team mindset with the communication skills necessary to translate complex technical requirements into reality.

**What's On Offer**

*   Competitive salary up to £45,000 plus an annual performance-related bonus.
*   Truly flexible, remote-friendly working model designed to support a healthy work-life balance.
*   The opportunity to work on a diverse and interesting platform within an established, supportive dev team.
*   Clear pathways for career progression as the company continues its aggressive growth phase.

**Apply via Haystack today!**

Web Developer

**Location:** Remote

**Salary:** £70,000 - £80,000

**About us**

At Arbor, we're on a mission to transform the way schools work for the better. 

We believe in a future of work in schools where being challenged doesn't mean being burnt out and overworked. Where data guides progress without overwhelming staff. And where everyone working in a school is reminded why they got into education every day. 

Our MIS and school management tools are already making a difference in over 7,000 schools and trusts. Giving time and power back to staff, turning data into clear, actionable insights, and supporting happier working days. 

At the heart of our brand is a recognition that the challenges schools face today aren't just about efficiency, outputs and productivity - but about creating happier working lives for the people who drive education everyday: the staff. We want to make schools more joyful places to work, as well as learn. 

**About the role**

We are looking for a highly-technical and diligent Senior Product Engineer to join our Engineering team and help us build mobile applications used by millions of parents, students, and school staff, using React Native. The remit and focus of the role is to be a key individual contributor, driving technical excellence, implementing robust and scalable solutions, and championing best practices. Working closely with the team's Tech Lead, Engineering Manager, and Product Manager, this role requires the hands-on expertise and technical judgement needed to guide delivery and ensure the long-term health of our mobile technology. It's a broad and exciting role, so we're looking for someone up for a challenge - if you're  collaborative and a good team player, this is the role for you.

**Core responsibilities**

*   Contribute to the build of the mobile application architecture, selecting appropriate libraries and tools to ensure our products are robust, scalable, and secure
*   Write clean, high-quality, and well-tested React Native code, setting a high standard for the team
*   Adhere to and promote established coding standards, and actively contribute to the organisation's automated testing frameworks to enable a quality-first culture
*   Work closely with the Tech Lead, Product Manager, Engineering Manager, QA, Designers, and other Engineers to ensure technical delivery is aligned with product strategy and the organisation's API strategy
*   Play a role in hiring and onboarding, and support the mentoring of junior engineers where required
*   Actively ensure non-functional requirements like performance, reliability, and security are addressed in all solution designs
*   Ensure accountability by making sure systems are observable and meet agreed Service Level Objectives (SLOs). Contribute to Root Cause Analysis when issues occur
*   Provide accurate estimation and feasibility assessments, making sure plans are realistic and aligned with team skills and capacity
*   Proactively identify and address technical debt to ensure long-term product health and maintainability

**RequirementsAbout you**

*   Significant professional experience building, shipping, and maintaining complex mobile applications using React Native
*   Experience with enterprise-scale or high-availability app and systems
*   Proven experience taking a mobile application from initial concept through to a successful launch on the App Store and/or Google Play
*   Strong grounding in engineering principles and design patterns (e.g. SOLID, DRY)
*   Deep experience designing, consuming, and collaborating on RESTful APIs, with a strong understanding of mobile-centric API requirements
*   Familiarity with observability practices (monitoring, metrics, alerting) and Root Cause Analysis
*   Understanding of secure coding and compliance requirements
*   Experience with mentoring engineers, and a passion for fostering a collaborative, high-performing team culture
*   Ability to communicate clearly with both technical and non-technical stakeholders
*   Agile facilitation (Scrum/Kanban) and continuous improvement

**Bonus skills**

*   Native mobile development experience (Swift/Kotlin) for building bridges or performance-critical components
*   Hands-on experience setting up CI/CD pipelines for React Native applications (e.g., using tools like Fastlane, Bitrise, or GitHub Actions)
*   Knowledge of the PHP ecosystem, to better facilitate backend collaboration

**BenefitsWhat we offer**

The chance to work alongside a team of hard-working, passionate people in a role where you'll see the impact of your work everyday. We also offer:

*   A dedicated wellbeing team who champion initiatives such as mindfulness, lunch n learns, manager training, mental health first aid training and much more!
*   32 days holiday (plus Bank Holidays). This is made up of 25 days annual leave plus 7 extra company wide days given over Easter, Summer & Christmas
*   Life Assurance paid out at 3x annual salary
*   Comprehensive wellness benefit provided by AIG Smart Health, which provides a 24/7 virtual GP service, Mental health support, Counselling, and personalised Health Checks 
*   Private Dental Insurance with Bupa 
*   Salary sacrifice Pension provided by Scottish Widows
*   Enhanced maternity and adoption leave (20 weeks full pay) and paternity (6 weeks full pay) pay
*   5 free return to work maternity coaching sessions, helping you adapt to this new exciting time of life!
*   Access to services such as Calm and Bippit (financial wellbeing coaching) 
*   All of our roles champion flexible working and we are happy to discuss what this means to you
*   Social committees that plan team, office and company wide events to bring people together and celebrate success
*   Dedicated professional development training budget (CPD courses, upskilling resources, professional memberships etc)
*   Volunteer with a charity of your choice for a day each year
*   Dog friendly offices!

**Interview process***   Phone screen
*   1st stage
*   2nd stage

We are committed to a fair and comfortable recruitment process, so if you require any reasonable adjustments during your application or interview process, please reach out to a member of the team at careers@arbor-education.com.

Our commitment is also backed by our partnership with Neurodiversity Consultancy, Lexxic who provide us with training, support and advice. 

**Arbor Education is an equal opportunities organisation**

Our goal is for Arbor to be a workplace which represents, celebrates and supports people from all backgrounds, and which gives them the tools they need to thrive - whatever their ambitions may be so we support and promote diversity and equality, and actively  encourage applications from people of all backgrounds. 

**Refer a friend** 

Know someone else who would be good for this role? You can refer a friend, family member or colleague, if they are offered a role with Arbor, we will say thank you with a voucher valued up to £200! Simply email: careers@arbor-education.com 

**Please note:** We are unable to provide visa sponsorship at this time.

Senior Product Engineer (React Native)

**Upcoming Project – Talent Pipeline**

We are actively building a pipeline of experienced engineers for upcoming client projects, with some opportunities expected to begin as soon as possible. While start dates are dependent on project timing, this role reflects active hiring needs aligned with confirmed and anticipated work. Candidates who are not selected for the immediate opportunity may be transitioned into our evergreen talent pipeline and considered for future engagements.

**With over 20 years of fully remote experience, Lumenalta offers:**

*   Fully remote work
*   Rapid growth opportunities
*   Self-Improvement
*   Industry-leading clients
*   Nurturing engineers’ career paths

**What You Will Work On**

*   Collaborate with visionary enterprise clients
*   Create transformative digital products
*   Learn how to handle difficult situations
*   Tackle complex challenges at scale
*   Push boundaries with emerging technologies

**Requirements**

*   Expertise in React, Node, Express, Mongo, SQL
*   We have a 2-hour assessment
*   High-level English proficiency (written & verbal)
*   Show up as a proactive, team-oriented self-starter on Zoom

**Why Lumenalta?**

*   Work on meaningful, impactful projects.
*   Collaborate with a talented, supportive team
*   Enjoy a flexible, remote-first environment
*   Join a company that values your growth

If you’re a passionate, career-focused developer ready to make a lasting impact, we want to hear from you!

What's it like to work at Lumenalta?

**Location**

This is a fully remote position; however, for the initial project, candidates must be available to work **UK business hours** to align with client and team schedules. Candidates may also be considered for future opportunities within our evergreen talent pipeline, which may align with **Pacific, Central, or Eastern U.S. time zones**, depending on project requirements.

**Application Deadline**

Applications will be accepted until **April 12, 2026**. Candidates can expect feedback by **May 1, 2026**. As we continue to build our pipeline, the position may be reposted to connect with additional qualified professionals.

Javascript Fullstack Engineer - Senior

At ReversingLabs, our software supply chain security and threat intelligence solutions have become essential to advancing cybersecurity maturity around the globe. We're on a journey to expand adoption and accelerate growth by hiring top talent across the security industry. Notable breaches such as SolarWinds, CircleCI, and 3CX have elevated software supply chain security as a top initiative across every organization developing or purchasing software. Only ReversingLabs delivers the software package analysis speed and intelligence needed to protect against this critical area of risk. Our vision is clear. Arming every company with end-to-end insights to ensure development releases securely, IT purchases safely, and the SOC can effectively detect, isolate, and respond. Your future role as a Senior Software Engineer is extremely important for the success of our solution - a Spectra Assure platform for software assurance. This is a game-changing opportunity. Our company is at the forefront of innovation, with many aspects built from scratch, fostering an engineering-driven approach. We prioritize developer experience and the development of high-quality, well-documented, and tested code within our Research organization. You and your teammates will work on developing a scalable and resilient SaaS platform. You will also be able to directly influence the architecture decisions and will be responsible for developing large parts of the new product. We are looking for people who can work independently, but also be a part of a team, and who adhere to the best practice engineering principles for clean and maintainable code. Crucially, if you identify more with being a skilled developer familiar with frontend technologies than strictly a frontend developer, you'll be a great fit for our team. **Responsibilities**

*   Develop a scalable and resilient SaaS platform, ensuring seamless integration between frontend and backend components for optimal performance and stability
*   Influence architecture decisions by offering strategic insights and recommendations based on expertise and best practices
*   Write, maintain, and optimize efficient, reusable, and reliable TypeScript and Python code
*   Stay up to date with industry best practices, emerging technologies, and modern design patterns
*   Translate UX designs into high-quality, user-friendly interfaces
*   Diagnose, troubleshoot, document, and resolve technical issues to maintain system reliability
*   Oversee and execute enterprise application deployments in production environments
*   Engage proactively with the product, understand its features, and contribute to its continuous improvement
*   Take technical ownership of complex feature development, ensuring scalability and maintainability

**Required Skills**

*   7+ years of experience in software development
*   Advanced knowledge of programming in Typescript (Advanced knowledge of HTML5, CSS3 and React framework)
*   Good knowledge of programming in Python or other OO languages
*   Experience with setting up and maintaining frontend and backend tooling (build and test)
*   Experience in writing and maintaining a large codebase, making decisions that benefit long-term maintainability of such codebase
*   Fluent English communication skills (written and spoken) are essential for this role
*   Ability to work independently and as part of a team
*   Experience with implementing complex workflows
*   Experience with Docker and related technologies

**A BIG PLUS**

*   Experience with Redux Toolkit, Material-UI, Webpack, and Storybook
*   Experience with Django, PostgreSQL
*   Experience with writing secure code

**What We OfferBenefits & Perks{{{{:}}}} Designed for How You Work, Live, and Grow** At ReversingLabs, we believe great work starts with feeling supported. We meet all statutory employment requirements in the United Kingdom and go beyond them. Ensuring you feel valued, secure, and set up to thrive both professionally and personally. **Statutory Benefits (United Kingdom)**

*   Paid annual leave, including public holidays
*   Statutory sick pay and parental leave
*   Workplace pension contributions
*   A safe, inclusive, and supportive work environment

And because we believe in supporting the whole employee experience, Beyond statutory benefits. We offer a thoughtfully designed total rewards package and additional perks that supports your well-being, growth, and long-term success. **Compensation & Financial Security**

*   A competitive compensation package, including base salary and performance-based bonus or commission (role-dependent), as well as equity, so you share in the success you help build

**Work-Life Balance & Flexibility**

*   Quarterly Wellness Weekends{{{{:}}}} company-wide 3-day breaks built into the year to truly rest and reboot
*   Monthly phone allowance to help offset mobile expenses
*   Medical allowance to support your healthcare needs
*   Volunteer Time Allowance{{{{:}}}} 8 paid hours annually to support a charitable organisation you care about
*   Complimentary Calm app membership to support mindfulness, focus, and stress management

**Growth, Learning & Culture**

*   Continuous learning and development with full access to Udemy Business
*   Clear paths for advancement, internal mobility, and ongoing career development
*   A collaborative, innovative, and remote-first environment where your work has real impact

**Workplace Recognition** ReversingLabs is proud to be recognized as a Best Workplace by Inc. (2025) and a Best Place to Work by Built In (2025 & 2026) across multiple categories. Reflecting our commitment to building a workplace where people feel valued, supported, and empowered to grow. ReversingLabs was founded in 2009 with the mission to offer the ultimate threat detection solutions. Our security products are used by some of the largest organizations in the world, including 2 of the top 3 banks, 4 of the top 6 software companies, and 2 of the top 6 insurance companies. We have been honored with numerous awards through the years including the 2023 Global InfoSec Award, 2022 CDM Global Infosec Awards, 2021 SC Media Trust Award for Best Threat Intelligence Technology, a 2020 Stevie Award, and the 2017 JPMorgan Chase Hall of Innovation Award for our truly unique malware and explainable threat intelligence products. Our pioneering technologies, exceptional products, and successful customer deployments also drove investments in ReversingLabs by some of the prominent investors in the world. With remote employees throughout the United States and England, and offices in Boston, United States and Zagreb, Croatia, ReversingLabs will continue to deliver groundbreaking innovation with top global talent. We are committed to an inclusive and diverse team. ReversingLabs is an equal opportunity employer. We do not discriminate based on race, color, ethnicity, ancestry, national origin, religion, sex, gender, gender identity, gender expression, sexual orientation, age, disability, veteran status, genetic information, marital status or any legally protected status. If there is a match between your experiences/skills and the Company needs, we will contact you directly. ReversingLabs is an equal opportunity employer. **Applicants only - Recruiting agencies, please do not contact.**

Senior Full Stack Software Engineer

**Building the Future of Crypto** Our Krakenites are a world-class team with crypto conviction, united by our desire to discover and unlock the potential of crypto and blockchain technology. **What makes us different?** Kraken is a mission-focused company rooted in crypto values. As a Krakenite, you’ll join us on our mission to accelerate the global adoption of crypto, so that everyone can achieve financial freedom and inclusion. For over a decade, Kraken’s focus on our mission and crypto ethos has attracted many of the most talented crypto experts in the world. Before you apply, please read the Kraken Culture page to learn more about our internal culture, values, and mission. We also expect candidates to familiarize themselves with the Kraken app. Learn how to create a Kraken account here. As a fully remote company, we have Krakenites in 70+ countries who speak over 50 languages. Krakenites are industry pioneers who develop premium crypto products for experienced traders, institutions, and newcomers to the space. Kraken is committed to industry-leading security, crypto education, and world-class client support through our products like Kraken Pro, Desktop, Wallet, and Kraken Futures. **Become a Krakenite and build the future of crypto!Proof of workThe team** The Growth Engineering team builds the experiences that connect people to our ecosystem for the first time — and keeps them coming back. We design and ship the systems behind our marketing funnels, signup and KYC flows, and the key engagement features that help new users fund their accounts and explore our products. It’s a team with direct influence on company growth, global reach, and user engagement at scale. Our products serve millions of users globally. **How We Work**

*   We give engineers ownership and trust them to ship high-impact work with craftsmanship and accountability.
*   We move quickly, experiment often, and learn fast from data and feedback.
*   We work asynchronously across time zones, supporting each other with open communication and shared goals.

**Why This Role Matters** You’ll help define the foundation on which Growth Engineering — and the company — build. Your tools and systems will accelerate development across multiple teams, ensuring reliability and scalability for products that serve millions globally. If you’re passionate about creating elegant, powerful developer experiences and using engineering craft to drive real business impact, you’ll thrive here. **The opportunity** As a Senior Software Engineer within the Growth Platform team, you’ll design and maintain the internal tooling, services, and developer platforms that empower teams across Growth — and beyond — to move faster and ship more reliably. You’ll build SDKs, CLIs, APIs, and backend systems that make it easy for engineers to integrate growth features and infrastructure safely, consistently, and at scale. This role is for engineers who see developer experience, reliability, and scalability as multipliers for business impact.

*   Architect, build, and maintain SDKs, CLIs, APIs, and shared services that enable rapid experimentation and delivery across Growth engineering teams.
*   Develop internal tools and frameworks that improve engineering workflows, automation, and deployment efficiency.
*   Design and evolve scalable backend systems and databases, ensuring performance, security, and resilience.
*   Write clear, maintainable technical documentation and onboarding materials for engineers using platform tools.
*   Partner with other engineers to understand pain points and translate them into intuitive, reliable internal systems.
*   Own reliability, observability, and performance improvements across core services.
*   Collaborate with infrastructure and platform teams across the company to align on standards, tooling, and best practices.
*   Mentor engineers and advocate for engineering excellence, automation, and maintainability.

**Skills You Should HODL**

*   5+ years of software engineering experience, including building and maintaining backend systems or developer-facing tools.
*   Proficiency in building scalable applications and developer tooling using one of the following: TypeScript, Rust, Go, Python, or Ruby.
*   Experience designing and maintaining APIs, SDKs, or internal services consumed by other engineering teams.
*   Understanding of distributed systems, scalability, reliability, and secure software design.
*   Experience with infrastructure and tooling such as Docker, Kubernetes, Terraform, MySQL/MariaDB, Redis, or GitLab CI/CD.
*   Strong communication and documentation skills — you can make complex systems approachable to other developers.
*   Nice to have: familiarity with React or React Native, especially when building front-end SDKs or shared components.
*   Ability to operate autonomously in a globally distributed, remote-first environment.

**Nice to haves**

*   Experience building internal developer platforms or frameworks used across multiple teams.
*   Background in observability, reliability engineering, or service instrumentation.
*   Experience driving technical design across large codebases or multi-team environments.

_Unless a specific application deadline is stated in the job posting, applications are accepted on an ongoing basis._ _Please note, applicants are permitted to redact or remove information on their resume that identifies age, date of birth, or dates of attendance at or graduation from an educational institution._ _We consider qualified applicants with criminal histories for employment on our team, assessing candidates in a manner consistent with the requirements of the San Francisco Fair Chance Ordinance._ Kraken is powered by people from around the world and we celebrate all Krakenites for their diverse talents, backgrounds, contributions and unique perspectives. We hire strictly based on merit, meaning we seek out the candidates with the right abilities, knowledge, and skills considered the most suitable for the job. We encourage you to apply for roles where you don't fully meet the listed requirements, especially if you're passionate or knowledgable about crypto! We may ask candidates to complete job-related skills or work-style assessments as part of our hiring process. **These assessments are designed to evaluate competencies relevant to the role and are applied consistently across candidates for similar positions.** Assessment results are considered alongside other **relevant** information, **such as experience and interviews,** and are not the sole basis for any employment decision. As an equal opportunity employer, we don’t tolerate discrimination or harassment of any kind. Whether that’s based on race, ethnicity, age, gender identity, citizenship, religion, sexual orientation, disability, pregnancy, veteran status or any other protected characteristic as outlined by federal, state or local laws. **Stay in the know** Follow us on Twitter Learn on the Kraken Blog Connect on LinkedIn Candidate Privacy Notice

Senior Software Engineer - Backend - Growth Platform

**About The Role** Abnormal AI is looking for a Software Engineer to join the Portal Platform team. Our team’s mission is to uplevel the architecture across our different portals here at Abnormal:

*   Customer Portal - a gateway our customers use to interact with Abnormal
*   End User portal - functionality for the users inside the companies that have purchased our product
*   Demo portal - a tool to help showcase different combinations of our product by GTM teams

Main themes include helping reach and maintain enterprise grade stability, security & usability for our customers while enabling application teams to easily develop & deploy their frontend components utilising AI-driven workflows. This role offers an exciting opportunity to join an AI-native company. You will own truly impactful, platform-level work, driving cross-functional influence that spans across product development and enabling our go-to-market teams. You'll join a team of experienced engineers, collaborating with them to design components & drive execution. The ideal candidate is comfortable working with a distributed team & has worked in a full-stack capacity before in enterprise environments. What you will do

*   Design and execute platform-level software projects from conception through launch, collaborating with senior engineers across the organization.
*   Build and maintain backend services and APIs that power our portal experiences
*   Build reusable frontend libraries, design systems, and developer tooling that accelerate feature delivery across product teams
*   Own infrastructure concerns, including CI/CD pipelines, deployment automation, and observability for portal applications.
*   Drive frontend performance, accessibility, and quality standards across our portal applications.
*   Raise the bar of excellence in engineering, actively contributing to knowledge sharing within the team, and participating in professional development activities.
*   Provide guidance and mentorship for junior members of the team
*   Help accelerate the teams with their changes across different realms of front-end development

Must Haves

*   6+ years of experience as a software engineer, with a track record of owning and delivering complex, cross-team projects end-to-end
*   Deep expertise in React and modern frontend architecture (state management, performance tuning, build tooling, design systems)
*   Strong backend proficiency in Python (Django) or TypeScript, with experience designing APIs and data models for scale
*   Experience with cloud infrastructure (AWS, Kubernetes, CI/CD) and comfort operating production systems
*   Demonstrated ability to influence technical direction — you've driven RFCs, architecture decisions, or platform migrations
*   Experience mentoring engineers and raising the technical bar through code reviews, documentation, and knowledge sharing
*   Strong communication skills, especially in distributed/async environments — you write clearly and proactively
*   Proven ability to balance technical debt with feature delivery at the platform level
*   You’re growth driven looking to increase impact and responsibility over time
*   Strong fundamentals in computer science, data structures, and performance optimization.
*   BS degree in Computer Science, Applied Sciences, Information Systems or other related engineering field

Nice to Have

*   Familiarity with our stack (AWS, K8, Python/Django, React, Postgres)
*   Experience and eagerness to leverage AI development tools
*   Experience with large scale web frontend applications
*   Experience with front end build tools
*   Experience with micro-frontend architecture patterns
*   Experience with web security (eg. OWASP top 10)

Abnormal AI is an equal opportunity employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, protected veteran status or other characteristics protected by law. For our EEO policy statement please _click here_. If you would like more information on your EEO rights under the law, please _click here_.

Senior Software Engineer - Full Stack - Portal Platform

**Senior-Lead Python Developer, Product Engineering | Django, FastAPI, TDD, AWS, JavaScript | Building Human Intelligence behind AI | Research + Healthcare | Remote (UK) | £80-100k + Bonus + EquityThe Company -** AI systems are only as reliable as the data and feedback loops behind them.

We’re partnering with a profitable, globally-used technology company building infrastructure that helps global organisations develop more reliable, trustworthy AI systems. Their platform supports teams working across research, healthcare, and enterprise environments - where accuracy, integrity, and real-world performance genuinely matter.

The business has been operating successfully for over a decade and is now scaling rapidly due to accelerating demand in AI. With strong product-market fit and significant growth ahead, they’re investing heavily in senior engineering talent to shape the next phase of the platform.

**The Role - Senior-Lead Python Developer, Product Engineering | Django, FastAPI, TDD, AWS, JavaScript | Building Human Intelligence behind AI | Research + Healthcare | Remote (UK) | £80-100k + Bonus + Equity**

You’ll join a senior, product-focused engineering team working in small high performance teams building high-scale backend systems that sit at the core of the company’s platform.

This is a backend-first role (Python ≈70%) with meaningful influence across system design, architecture, and product direction.

You’ll operate with real ownership - balancing delivery speed, scalability, and long-term maintainability - while contributing to a platform that underpins critical AI-driven applications globally.

**What You’ll Be Doing -Senior-Lead Python Developer, Product Engineering | Django, FastAPI, TDD, AWS, JavaScript | Building Human Intelligence behind AI | Research + Healthcare | Remote (UK) | £80-100k + Bonus + Equity**

*   Designing and owning backend services in **Python (Django / FastAPI)**
*   Building scalable APIs and workflows supporting global usage
*   Improving reliability, performance, and developer experience
*   Working closely with Product and Design to shape features end-to-end
*   Contributing across the stack when useful (TypeScript exposure)
*   Helping evolve engineering standards as the team scales

This is a pragmatic, fast-moving Product Engineering centric environment - but with a strong emphasis on thoughtful engineering.

**Tech Stack** - **Senior-Lead Python Developer, Product Engineering | Django, FastAPI, TDD, AWS, JavaScript | Building Human Intelligence behind AI | Research + Healthcare | Remote (UK) | £80-100k + Bonus + Equity**

*   Python (Django core)
*   FastAPI (in parts)
*   PostgreSQL
*   TypeScript / Vue.js
*   AWS
*   Modern CI/CD practices

**What They’re Looking For - Senior-Lead Python Developer, Product Engineering | Django, FastAPI, TDD, AWS, JavaScript | Building Human Intelligence behind AI | Research + Healthcare | Remote (UK) | £80-100k + Bonus + Equity**

*   4–6+ years of professional software engineering experience
*   Strong production-grade Python
*   Experience building scalable backend systems
*   Comfort operating with ambiguity and ownership
*   Product mindset - thinking beyond implementation
*   Clear communicator, collaborative by nature
*   Experience in startup or scale-up environments preferred
*   No degree requirements

Exposure to AI systems, research platforms, or data-intensive products is a bonus — not required.

**Interview Process - Senior-Lead Python Developer, Product Engineering | Django, FastAPI, TDD, AWS, JavaScript | Building Human Intelligence behind AI | Research + Healthcare | Remote (UK) | £80-100k + Bonus + Equity**

*   30-minute intro (Engineering & Talent)
*   60-minute collaborative Python pairing session
*   Product & architecture discussion
*   Final conversation with senior leadership

Structured, respectful, and focused on real-world thinking.

**Why Join** \- **Senior-Lead Python Developer, Product Engineering | Django, FastAPI, TDD, AWS, JavaScript | Building Human Intelligence behind AI | Research + Healthcare | Remote (UK) | £80-100k + Bonus + Equity**

*   Globally used platform with strong product-market fit
*   Direct impact on how modern AI-enabled systems perform in the real world
*   Senior hiring bar - high quality, low ego
*   Fully remote within the UK, with a London office
*   Engineering team scaling from ~60 → 100+
*   £80–100k base + bonus + equity
*   Strong benefits package

If you’re a senior Python engineer who enjoys building robust, high-scale systems and wants your work to contribute to more reliable, real-world AI applications - this is a genuinely meaningful opportunity.

Apply with your CV and we’ll be in touch if there’s alignment :)

Senior-Lead Python Developer, Product Engineering | Django, FastAPI, TDD, AWS, JavaScript | Building Human Intelligence behind AI | Research + Healthcare | Remote (UK) | £80-100k + Bonus + Equity

We are looking for a Front-End Developer to join our team to train AI models. You will measure the progress of these AI chatbots, evaluate their logic, and solve problems to improve the quality of each model. To apply to this role, you will need to be proficient in either Python and/or JavaScript. Your role will require proficiency in at least one programming language (JavaScript, Python, C#, C++, HTML, SQL, or Swift) in order to solve coding problems (think LeetCode, HackerRank, etc). For each coding problem, you must be able to explain how your solution solves the problem. **Benefits**

*   This is a full-time or part-time REMOTE position
*   You’ll be able to choose which projects you want to work on
*   You can work on your own schedule
*   Projects are paid hourly up to $60 USD/hour, with bonuses for high-quality and high-volume work

**Responsibilities**

*   Give AI chatbots coding challenges and evaluate their outputs
*   Evaluate the quality produced by AI models for correctness and performance

**Qualifications**

*   Fluency in English (native or bilingual level)
*   Detail-oriented
*   Experience with algorithms, data structures, and debugging workflows
*   A current, in progress, or completed Masters and/or PhD is preferred but not required

**Notes** Payment is made via PayPal. We will never ask for any money from you. PayPal will handle any currency conversions from USD. Only applicants in Australia will be considered for this role. This is an independent contract position. #SWE

Front-End Developer

**Building the Future of Crypto** Our Krakenites are a world-class team with crypto conviction, united by our desire to discover and unlock the potential of crypto and blockchain technology. **What makes us different?** Kraken is a mission-focused company rooted in crypto values. As a Krakenite, you’ll join us on our mission to accelerate the global adoption of crypto, so that everyone can achieve financial freedom and inclusion. For over a decade, Kraken’s focus on our mission and crypto ethos has attracted many of the most talented crypto experts in the world. Before you apply, please read the Kraken Culture page to learn more about our internal culture, values, and mission. We also expect candidates to familiarize themselves with the Kraken app. Learn how to create a Kraken account here. As a fully remote company, we have Krakenites in 70+ countries who speak over 50 languages. Krakenites are industry pioneers who develop premium crypto products for experienced traders, institutions, and newcomers to the space. Kraken is committed to industry-leading security, crypto education, and world-class client support through our products like Kraken Pro, Desktop, Wallet, and Kraken Futures. **Become a Krakenite and build the future of crypto!Proof of workThe team** The Growth Engineering team builds the experiences that connect people to our ecosystem for the first time — and keeps them coming back. We design and ship the systems behind our marketing funnels, signup and KYC flows, and the key engagement features that help new users fund their accounts and explore our products. It’s a team with direct influence on company growth, global reach, and user engagement at scale. Our products serve millions of users globally. **How We Work**

*   We give engineers ownership and trust them to ship high-impact work with craftsmanship and accountability.
*   We move quickly, experiment often, and learn fast from data and feedback.
*   We work asynchronously across time zones, supporting each other with open communication and shared goals.

**Why This Role Matters** Every feature you build will have a visible impact on how people discover, trust, and engage with our products globally. The Growth Engineering team operates at the intersection of product, marketing, and infrastructure — turning ideas into measurable results. If you’re an engineer who enjoys solving business problems through code and believes engineering excellence drives growth, this role is built for you. **The opportunity** As a Senior Software Engineer within Growth Product team, you’ll take on complex, high-impact problems that blend product thinking and engineering excellence. You’ll work across web and mobile platforms, collaborating with design, data, and product teams to deliver features that drive measurable business outcomes. This is an ideal role for engineers who use their technical skills to create real-world impact — translating high-level business goals into engineering solutions that improve activation, retention, and monetization worldwide.

*   Partner with product managers, designers, and analysts to identify growth opportunities and turn them into high-quality, data-driven engineering solutions.
*   Implement reusable services and components that power marketing campaigns, onboarding, KYC, and first-funding experiences across web and mobile.
*   Collaborate on distributed systems that handle large volumes of global traffic while maintaining high performance and reliability.
*   Participate in design and architecture discussions, balancing user impact, scalability, and maintainability.
*   Measure, experiment, and iterate — using data and experimentation frameworks to understand what drives user behavior.
*   Uphold and improve engineering standards, performance, and security practices across the stack.

**Skills You Should HODL**

*   5+ years of software engineering experience, including building and maintaining production systems at scale.
*   Proficiency in building full-stack applications using one of the following: TypeScript, Rust, Go, Python, or Ruby, and React or React Native.
*   Understanding of distributed systems, performance optimization, debugging, and secure software design.
*   Familiarity with infrastructure and tooling such as Docker, Kubernetes, Terraform, MySQL/MariaDB, Redis, or GitLab CI/CD.
*   A product mindset — you care about how your work moves key metrics, not just about the code itself.
*   Ability to operate autonomously in a globally distributed, remote-first environment.

**Nice to haves**

*   Experience with A/B testing, analytics instrumentation, or experimentation platforms.
*   Background in growth engineering, user funnels, lifecycle, or conversion optimization.
*   Familiarity with data analysis tools or experimentation frameworks.

_Unless a specific application deadline is stated in the job posting, applications are accepted on an ongoing basis._ _Please note, applicants are permitted to redact or remove information on their resume that identifies age, date of birth, or dates of attendance at or graduation from an educational institution._ _We consider qualified applicants with criminal histories for employment on our team, assessing candidates in a manner consistent with the requirements of the San Francisco Fair Chance Ordinance._ Kraken is powered by people from around the world and we celebrate all Krakenites for their diverse talents, backgrounds, contributions and unique perspectives. We hire strictly based on merit, meaning we seek out the candidates with the right abilities, knowledge, and skills considered the most suitable for the job. We encourage you to apply for roles where you don't fully meet the listed requirements, especially if you're passionate or knowledgable about crypto! We may ask candidates to complete job-related skills or work-style assessments as part of our hiring process. **These assessments are designed to evaluate competencies relevant to the role and are applied consistently across candidates for similar positions.** Assessment results are considered alongside other **relevant** information, **such as experience and interviews,** and are not the sole basis for any employment decision. As an equal opportunity employer, we don’t tolerate discrimination or harassment of any kind. Whether that’s based on race, ethnicity, age, gender identity, citizenship, religion, sexual orientation, disability, pregnancy, veteran status or any other protected characteristic as outlined by federal, state or local laws. **Stay in the know** Follow us on Twitter Learn on the Kraken Blog Connect on LinkedIn Candidate Privacy Notice

Senior Software Engineer

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