We're working with a market-leading digital content protection platform that secures valuable media for globally recognised brands on this exciting opportunity. Own and evolve a proven full-stack platform—build React frontends, craft Java/C++ services, and shape cloud infra (AWS). You'll drive reliability, performance and security across applications, networks and Qt desktop clients while pushing architectural decisions with real autonomy. **The Role**

*   Evolve software architecture across frontend (React), backend (Java/C++), and infrastructure (AWS, Docker).
*   Design and implement new features in React apps and Java/C++ services; maintain Qt-based desktop clients.
*   Lead performance optimisation across software, MySQL databases and cloud infrastructure; profile, tune and monitor systems.
*   Deliver system integrations and infrastructure improvements including cloud-native deployments and CI/CD enhancements.
*   Own system reliability and security: network admin, access controls, monitoring and incident response.

**What You'll Need**

*   3+ years full-stack development experience across frontend, backend and infrastructure.
*   Hands-on React, Java and C/C++ development experience; proven work with Qt desktop applications.
*   Strong database skills with MySQL: schema design, indexing, query optimisation and backups.
*   Experience with AWS (EC2, S3, RDS, IAM) and cloud concepts; familiarity with Docker, CI/CD and infrastructure as code.
*   Practical knowledge of network administration, system security, performance profiling and Linux-based deployment.

**What's On Offer**

*   Significant technical ownership and scope to influence architecture and deliver new capabilities.
*   Work across a broad, modern stack—React, Java, C++, Qt, MySQL and AWS—in a collaborative engineering team.
*   Remote-friendly environment with flexible working and a focus on impact, autonomy and career growth.
*   Exposure to production-scale performance and security challenges for globally recognised media customers.

**Apply via Haystack today!**

Software Engineer

**_About Prolific_** Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills. _**The role**_ We’re looking for JavaScript Developers to help train and evaluate cutting-edge AI models. If you have the necessary experience, we’ll send you an assessment to test your skills and suitability for AI tasks. If successful, you’ll be invited to join Prolific as a Domain Expert participant, where you’ll get paid to train and evaluate powerful AI models. Researchers looking for your skills tend to pay $40/hr per AI task completed. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter. _**What you’ll bring**_

*   JavaScript developer skills and verifiable professional experience as a JavaScript developer
*   A willingness to take our skills verification test to assess your suitability for our Domain Expert participant pool
*   Strong attention to detail and the ability to concentrate on complex tasks for up to one hour at a time
*   A reliable and fast internet connection and access to a computer
*   A willingness to self-declare your earnings, as our participants are self-employed
*   A Paypal account to receive payment from our clients

_**What you’ll be doing in the role**_

*   Completing AI training tasks such as analyzing, editing, and writing JavaScript
*   Judging the performance of AI in performing JavaScript-related prompts
*   Improving cutting-edge AI models

_**Key Technologies**_

*   JavaScript

_Why Prolific is a great platform to join as a Domain Expert participant_ Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home. We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breath and the best of humanity. _**Links to more information on Prolific**_ Website Youtube _Privacy Statement_ **By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific use of your personal information.**

AI Trainer - Advanced JavaScript Developers

**Senior Front End Developer | £50,000 - £70,000** We're working with an innovative and fast-growing technology business on this exciting opportunity. We are looking for a high-impact developer to join a fast-paced engineering team where you’ll have total ownership over the frontend ecosystem, spanning both web and mobile platforms. This is a rare chance to bridge the gap between high-performance web applications and native mobile experiences using a modern stack of React, Next.js, and React Native. You will be the technical lead for frontend features, ensuring seamless integration with Node.js microservices and managing the full lifecycle from code to the App Store. **The Role**

*   Lead the development and maintenance of high-traffic web applications using React and Next.js.
*   Architect and deploy cross-platform mobile applications using React Native and Expo.
*   Manage complex authentication flows and secure identity integration using MSAL.
*   Take full ownership of the mobile release process, including production deployments to the Apple App Store.
*   Collaborate with backend engineers to integrate frontend layers with scalable Node.js microservices on Azure.

**What You'll Need**

*   5+ years of commercial experience building complex applications with React.
*   Proven track record of delivering mobile apps using React Native and Expo.
*   Deep expertise in Next.js for server-side rendering and performance optimization.
*   Hands-on experience with Microsoft Authentication Library (MSAL) and Azure environment configurations.
*   Strong architectural mindset with the ability to work independently in a remote-first environment.

**What's On Offer**

*   Highly competitive salary of £50k - £70k based on experience.
*   Fully remote working model offering true work-life balance.
*   Opportunity to lead technical decisions and shape the frontend roadmap.
*   Exposure to a modern, cloud-native stack within a rapidly scaling tech firm.

**Apply via Haystack today!**

Senior Frontend Developer

**React Developer | £50,000 - £60,000** We're working with a dynamic enterprise software consultancy on this exciting opportunity. Are you a front-end expert who thrives on building sleek, high-performance interfaces? We are looking for a React Specialist to join a high-impact team, leveraging modern JavaScript (ES6+), React Hooks, and functional programming to deliver enterprise-scale applications. You will bridge the gap between UI/UX design and technical implementation, ensuring every component is accessible, performant, and scalable. **The Role**

*   Lead the development of user-facing features using React.js and modern JavaScript, ensuring high-quality code across the SDLC.
*   Architect and maintain reusable UI component libraries using HTML5 and CSS3 to streamline delivery across multiple teams.
*   Collaborate directly with Backend Engineers and QA teams to integrate RESTful APIs and ensure seamless end-to-end functionality.
*   Drive performance optimization and debugging using browser profiling and React Dev Tools to ensure rapid cross-browser compatibility.
*   Shape the front-end landscape by participating in rigorous code reviews and contributing to best practices in an Agile environment.

**What You'll Need**

*   3-5 years of professional experience in Front-End Engineering with a deep focus on React and its core principles.
*   Proven expertise in JavaScript (ES6+), React Hooks, and state management within enterprise-scale application environments.
*   Strong commitment to accessibility standards (WCAG) and building responsive designs that work flawlessly on any device.
*   Experience working within an Agile delivery model, translating complex business requirements into clean, maintainable technical solutions.
*   A proactive attitude with the ability to learn quickly and take a lead role in technical problem-solving.

**What's On Offer**

*   Competitive salary up to £60,000 based on experience.
*   Remote-friendly working arrangements providing a great work-life balance.
*   The opportunity to work on large-scale, high-visibility projects for global clients.
*   A collaborative environment that prioritizes professional growth and continuous learning.

**Apply via Haystack today!**

React Developer

**Senior NetSuite Developer | £35,000 - £60,000** We're working with a leading enterprise ERP solutions provider on this exciting opportunity. We are looking for a technical powerhouse to drive innovation within a complex NetSuite ecosystem, leveraging SuiteScript 2.x and modern JavaScript frameworks to build high-performance business tools. As a Senior Developer and technical leader, you will be the driving force behind the platform's evolution, transforming business requirements into scalable code. This is a rare chance to blend deep NetSuite expertise with modern web technologies like React.js and Vue.js in a collaborative, remote-friendly environment. **The Role**

*   Lead the end-to-end development of custom NetSuite solutions using SuiteScript 2.x, Advanced PDF Development, and Freemarker.
*   Architect and optimize complex NetSuite Workflows and Web Services (XML/SQL) to streamline enterprise operations.
*   Mentor and guide junior members of the team, acting as a Lead Developer to shape best practices across the full SDLC.
*   Build and integrate sleek front-end components using JavaScript, JQuery, HTML, and modern frameworks like React.js or Vue.js.
*   Manage version control and deployments via GitHub and WebStorm within an Agile development methodology.

**What You'll Need**

*   3+ years of commercial NetSuite development experience with a degree in Computer Science or Software Engineering.
*   Expert-level proficiency in SuiteScript 2.x, JavaScript (ES6+), and Object-Oriented Programming (OOP).
*   Technical mastery of Advanced PDF/Freemarker and building robust integrations via Web Services and AJAX.
*   Proven experience in a Team Lead capacity with the ability to manage tight deadlines in a dynamic, high-growth environment.
*   Familiarity with unit testing, Linode, and PHP is highly desirable to help bridge cross-platform requirements.

**What's On Offer**

*   Competitive salary range of £35,000 - £60,000 based on experience and leadership capability.
*   Remote-friendly working culture that prioritizes output over hours in-office.
*   The opportunity to lead technical strategy and mentor a talented team of developers.
*   A fast-paced, Agile environment where you can work with a modern tech stack (React/Vue/GitHub).

**Apply via Haystack today!**

Software Developer

**Job Description** We’re seeking a driven **Staff Fullstack Engineer** to join one of the fastest-growing legal tech companies in Europe as we scale the engineering foundation across our **AI product suite**. This role focuses on **owning and driving complex systems across our products**, ensuring performance, reliability, and scalability as we continue to grow. **Working closely with Engineering leadership**, you’ll operate as a **senior technical leader without direct reports**, taking ownership of key technical initiatives and driving execution across teams. For an engineer with **strong ownership mindset and technical leadership**, this is an opportunity to **take the lead on critical systems, improve architecture, and deliver high-impact results quickly.Your Challenge and Opportunity in This Role** As a Staff Fullstack Engineer, you’ll play a key role in shaping up the tech and best practices of our JUPUS Application **used by law firms across Europe**. You’ll take ownership of **complex technical topics**, drive implementation, and ensure systems are built for **performance, scalability, and reliability**. Expect **high responsibility, fast execution, and visible impact across the product suite**. **Tasks**

*   Own and drive complex features and systems across our Application
*   Lead implementation of high-impact technical initiatives end-to-end
*   Be on the forefront of technical guidelines and code quality
*   Improve system architecture, performance, and scalability
*   Work closely with AI Engineers to bring AI systems into reliable production environments
*   Build and maintain backend services, APIs, and frontend applications
*   Identify and resolve performance bottlenecks across application and database layers
*   Maintain strong testing practices including unit, integration, and end-to-end testing
*   Collaborate across teams to drive technical decisions and execution
*   Implement and evangelize internally best practices, new technologies and techniques

**RequirementsTechnical Expertise**

*   Strong experience building and scaling full-stack applications in production
*   Deep expertise in Python and Django
*   Experience with cloud infrastructure (preferably AWS)
*   Strong experience with PostgreSQL or similar relational databases
*   Experience with modern frontend frameworks (React, Vue.js, or similar)
*   Strong understanding of testing practices (unit, integration, E2E)

**Technical Leadership & Ownership**

*   Proven ability to own and drive complex technical topics independently
*   Strong focus on performance, scalability, and system design
*   Ability to make decisions and execute quickly in fast-moving environments
*   Proactive mindset with high ownership and low passivity
*   Experience improving existing systems and architecture pragmatically
*   Familiarity with AI-powered systems or workflows is a plus

**Further Requirements**

*   You must be located in the CET -2/+2 zone for this role

**Benefits** 🚀 **Product Impact –** Drive the systems powering our AI products 🔧 **Technical Ownership –** Take the lead on critical systems and initiatives without direct reports 🌱 **Growth Environment –** Work in a team focused on fast execution and continuous improvement 💼 **Leadership Visibility –** Direct collaboration with engineering leadership on key decisions 🏡 **Fully Remote –** Work from anywhere within the supported time zone 💻 **Top Equipment –** State-of-the-art MacBook and setup 🏋️ **Wellbeing Perks –** Urban Sports Club membership **If you want to take ownership of complex systems, drive technical direction, and deliver visible impact in a fast-moving AI environment, we’d love to hear from you.**

Staff Fullstack Engineer

Location Remote Germany; Remote Austria; Remote Netherlands; Remote Portugal; Remote Romania; Remote Spain; Remote United Kingdom Employment Type Full time Location Type Remote Department Product & Engineering OverviewApplication **About RoomPriceGenie ✨🧞‍♂️** Founded in 2017, RoomPriceGenie is dedicated to helping hoteliers around the globe achieve optimal pricing. 🌍 We understand that many small hotels face challenges with digitalization, making their operations increasingly complex and often resulting in lost revenue. This is where we come in! We have developed a powerful solution that enables hotels to set the right prices in just seconds. ⏱️ Our state-of-the-art algorithm analyzes both internal hotel data and market trends to recommend pricing strategies that enhance revenue and improve booking rates. With customers spanning the globe—from the USA and Canada to Iceland, South Africa, China, Slovenia, Italy, and the UK—RoomPriceGenie has made a meaningful impact in the hospitality industry, and our clients love the results. ❤️ Now, we are excited to expand our customer base and spread the word about how we can support hoteliers in optimizing their pricing strategies. We invite you to join us on this journey! We actively encourage applications from candidates with diverse backgrounds to enrich our team and drive innovation. **Your Role** As a **Senior Fullstack Engineer (Frontend-Focused)** in the Customer Journey Team (Growth) at RoomPriceGenie, you’ll build the user-facing experiences that drive activation, engagement, and long-term success. Your primary focus will be on **frontend development using React and TypeScript**, crafting intuitive, high-quality user interfaces and experiences. You’ll work closely with backend systems and should feel comfortable navigating and contributing to our **Python/Django** services when needed. You’ll operate with high autonomy, combining technical excellence with strong product awareness. Together with Product and Design, you’ll help us build a **data-informed, experimentation-driven product** that continuously improves the customer journey. **What You’ll Do**

*   Design, build and maintain high-quality, scalable frontend applications using React and TypeScript.
*   Own the end-to-end development of user-facing features, from UX implementation to backend integration.
*   Collaborate closely with backend engineers and contribute to Python/Django services when needed.
*   Take end-to-end ownership of product initiatives, from discovery to deployment, monitoring and iteration.
*   Write clean, maintainable and well-tested code, applying modern frontend testing practices.
*   Partner with Product, Data and Design to deliver impactful user experiences.
*   Ensure strong performance, accessibility and usability across the frontend.
*   Help instrument the frontend with the right events and data signals for analytics and experimentation.
*   Participate in architecture discussions and technical reviews, especially around frontend and API design.
*   Drive continuous improvement in frontend architecture, tooling and developer experience.

**Your Profile**

*   Strong professional experience as a Senior Software Engineer, with a focus on frontend development.
*   Advanced proficiency in React and TypeScript (or similar modern frontend frameworks).
*   Solid understanding of frontend architecture, state management and performance optimization.
*   Comfortable working with Python/Django backends — able to read, understand and contribute when needed.
*   Strong understanding of software design and testing practices.
*   Experience working in product-driven SaaS environments is a strong plus.
*   Familiarity with CI/CD pipelines, AWS infrastructure and modern observability tools.
*   A product-minded engineer who understands user needs and builds with impact in mind.
*   High ownership mentality — you enjoy taking features from idea to measurable outcome.
*   Strong collaboration and communication skills.
*   Fluent in English and based in the European time zone (UTC+0 to UTC+2).

**Nice to HaveExperience With Either**

*   Design systems, component libraries and frontend scalability patterns.
*   Product analytics and experimentation tooling.
*   Event-driven architectures (Kafka, Celery, message queues).
*   Data platforms (Snowflake, Airflow, dbt, Dagster, Cube).

**What We Offer at RoomPriceGenie** 💪 At RoomPriceGenie, we don’t just offer jobs; we offer an adventure! 🚀 Join us in an exciting startup atmosphere where you can grow your career while changing the world for tens of thousands of independent hoteliers. 🌍 Our global and diverse team is fueled by passion and a shared mission. We thrive in a culture that’s all about transparency, respect, and making a real impact together. Here’s what you can expect when you become part of our Genie family:

*   Remote-First Model: You can work flexibly from anywhere. 🌍🧑‍💻At the same time, we support co-working and you’re of course welcome to work from our offices in Mannheim, Berlin, or Sydney whenever you like. 🏢
*   One Team, One Vision, One Goal: We’re in this together! 🤝 Our Genies are laser-focused on our mission, collaborating to make magic happen. ✨ It’s no wonder we score a stellar 9.3 from our team members! 🌟
*   Epic Team Gatherings: Every year, we bring our global crew together 🌎 for a week of networking, brainstorming, and fun. 🎉 Plus, enjoy regular hangouts in our offices to keep the camaraderie alive.
*   Growth and Development: We’re all about lifelong learning! 📚 Level up your skills with personal and professional development opportunities. You’ll even snag up to three extra days off each year to focus on your growth. 📈
*   5 Years? 5 Weeks! Stick with us, and we’ll reward your loyalty. After five years, you’ll earn an incredible five weeks of bonus vacation time 🏖️ to recharge and explore the world. 🌍
*   Birthday Celebrations: It’s your day, so take it off! 🎂 Celebrate your birthday the way you want, guilt-free.
*   Flexible Hours: We get it—life happens! ⏰ We offer flexible working hours to help you balance your work and personal life seamlessly.
*   Wellbeing Matters: Your mental health is a top priority. 🧘 Every Genie gets access to Headspace, the leading meditation app, to help you cultivate a happier, healthier, and more zen life. 🌿
*   BetterHelp Support: We also offer BetterHelp, a professional online therapy and counseling platform, giving you additional support whenever you need it.💛🧠

_We kindly ask that recruitment agencies refrain from reaching out regarding this vacancy. Thank you for your understanding._ Powered by Ashby Privacy PolicySecurityVulnerability Disclosure

Remote Senior Fullstack Engineer (m/f/d)

**About RoomPriceGenie ✨🧞‍♂️** Founded in 2017, RoomPriceGenie is dedicated to helping hoteliers around the globe achieve optimal pricing. 🌍 We understand that many small hotels face challenges with digitalization, making their operations increasingly complex and often resulting in lost revenue. This is where we come in! We have developed a powerful solution that enables hotels to set the right prices in just seconds. ⏱️ Our state-of-the-art algorithm analyzes both internal hotel data and market trends to recommend pricing strategies that enhance revenue and improve booking rates. With customers spanning the globe—from the USA and Canada to Iceland, South Africa, China, Slovenia, Italy, and the UK—RoomPriceGenie has made a meaningful impact in the hospitality industry, and our clients love the results. ❤️ Now, we are excited to expand our customer base and spread the word about how we can support hoteliers in optimizing their pricing strategies. We invite you to join us on this journey! We actively encourage applications from candidates with diverse backgrounds to enrich our team and drive innovation. **Your Role** As a **Senior Fullstack Engineer (Frontend-Focused)** in the Customer Journey Team (Growth) at RoomPriceGenie, you’ll build the user-facing experiences that drive activation, engagement, and long-term success. Your primary focus will be on **frontend development using React and TypeScript**, crafting intuitive, high-quality user interfaces and experiences. You’ll work closely with backend systems and should feel comfortable navigating and contributing to our **Python/Django** services when needed. You’ll operate with high autonomy, combining technical excellence with strong product awareness. Together with Product and Design, you’ll help us build a **data-informed, experimentation-driven product** that continuously improves the customer journey. **What You’ll Do**

*   Design, build and maintain high-quality, scalable frontend applications using React and TypeScript.
*   Own the end-to-end development of user-facing features, from UX implementation to backend integration.
*   Collaborate closely with backend engineers and contribute to Python/Django services when needed.
*   Take end-to-end ownership of product initiatives, from discovery to deployment, monitoring and iteration.
*   Write clean, maintainable and well-tested code, applying modern frontend testing practices.
*   Partner with Product, Data and Design to deliver impactful user experiences.
*   Ensure strong performance, accessibility and usability across the frontend.
*   Help instrument the frontend with the right events and data signals for analytics and experimentation.
*   Participate in architecture discussions and technical reviews, especially around frontend and API design.
*   Drive continuous improvement in frontend architecture, tooling and developer experience.

**Your Profile**

*   Strong professional experience as a Senior Software Engineer, with a focus on frontend development.
*   Advanced proficiency in React and TypeScript (or similar modern frontend frameworks).
*   Solid understanding of frontend architecture, state management and performance optimization.
*   Comfortable working with Python/Django backends — able to read, understand and contribute when needed.
*   Strong understanding of software design and testing practices.
*   Experience working in product-driven SaaS environments is a strong plus.
*   Familiarity with CI/CD pipelines, AWS infrastructure and modern observability tools.
*   A product-minded engineer who understands user needs and builds with impact in mind.
*   High ownership mentality — you enjoy taking features from idea to measurable outcome.
*   Strong collaboration and communication skills.
*   Fluent in English and based in the European time zone (UTC+0 to UTC+2).

**Nice to Have** Experience with either:

*   Design systems, component libraries and frontend scalability patterns.
*   Product analytics and experimentation tooling.
*   Event-driven architectures (Kafka, Celery, message queues).
*   Data platforms (Snowflake, Airflow, dbt, Dagster, Cube).

**What we offer at RoomPriceGenie** 💪 At RoomPriceGenie, we don’t just offer jobs; we offer an adventure! 🚀 Join us in an exciting startup atmosphere where you can grow your career while changing the world for tens of thousands of independent hoteliers. 🌍 Our global and diverse team is fueled by passion and a shared mission. We thrive in a culture that’s all about transparency, respect, and making a real impact together. Here’s what you can expect when you become part of our Genie family:

*   Remote-First Model: You can work flexibly from anywhere. 🌍🧑‍💻At the same time, we support co-working and you’re of course welcome to work from our offices in Mannheim, Berlin, or Sydney whenever you like. 🏢
*   One Team, One Vision, One Goal: We’re in this together! 🤝 Our Genies are laser-focused on our mission, collaborating to make magic happen. ✨ It’s no wonder we score a stellar 9.3 from our team members! 🌟
*   Epic Team Gatherings: Every year, we bring our global crew together 🌎 for a week of networking, brainstorming, and fun. 🎉 Plus, enjoy regular hangouts in our offices to keep the camaraderie alive.
*   Growth and Development: We’re all about lifelong learning! 📚 Level up your skills with personal and professional development opportunities. You’ll even snag up to three extra days off each year to focus on your growth. 📈
*   5 Years? 5 Weeks! Stick with us, and we’ll reward your loyalty. After five years, you’ll earn an incredible five weeks of bonus vacation time 🏖️ to recharge and explore the world. 🌍
*   Birthday Celebrations: It’s your day, so take it off! 🎂 Celebrate your birthday the way you want, guilt-free.
*   Flexible Hours: We get it—life happens! ⏰ We offer flexible working hours to help you balance your work and personal life seamlessly.
*   Wellbeing Matters: Your mental health is a top priority. 🧘 Every Genie gets access to Headspace, the leading meditation app, to help you cultivate a happier, healthier, and more zen life. 🌿
*   BetterHelp Support: We also offer BetterHelp, a professional online therapy and counseling platform, giving you additional support whenever you need it.💛🧠

_We kindly ask that recruitment agencies refrain from reaching out regarding this vacancy. Thank you for your understanding._

Software Engineer

Job Description

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Haystack

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