_**hackajob** is collaborating with **Version 1** to connect them with exceptional professionals for this role._ **Job Description** As a **Senior JavaScript Developer**, you will join a cross-functional Scrum Team working collaboratively in an Agile environment. You will drive key front‑end and back‑end JavaScript technology decisions and build maintainable, scalable solutions for our clients. This role offers strong opportunities for continuous learning, technical ownership, and growth as a well-rounded developer. You will develop modern applications using **JavaScript** and relevant frameworks, hosted on Microsoft Azure cloud services. Strong emphasis is placed on collaboration, clean coding practices, and delivering high-quality solutions. While GIS experience is beneficial, it can be taught; deep JavaScript expertise is essential. **Key Responsibilities**

*   Design, develop, and maintain applications using JavaScript across front-end and/or back‑end services.
*   Build and consume RESTful APIs.
*   Implement and maintain CI/CD pipelines and automation workflows.
*   Write unit and integration tests to ensure high code quality.
*   Collaborate within a Scrum Team, participating in all Agile ceremonies.
*   (Optional / Trainable) Work with GIS technologies such as the ESRI SDK and ArcGIS suite to integrate spatial data and mapping capabilities into applications.

**QualificationsEssential Criteria**

*   5+ years of hands-on JavaScript development experience.

*   Experience with TypeScript is acceptable, but this role is focused on pure JavaScript.

*   Strong knowledge of modern JavaScript frameworks (e.g., React, Angular, Vue, or Node.js for backend).
*   Proven experience designing and developing REST‑based APIs.
*   Experience with CI/CD automation tools and modern DevOps practices.
*   Proficiency with Azure and familiarity with common cloud services.
*   Strong experience writing unit, integration, and automated tests.
*   Prior experience working in Agile/Scrum teams.

Senior JavaScript Developer

We’re looking for a curious, rigorous, problem-hungry platform engineer (who codes!) to carry the ball as we bring Ashby to the big leagues. Ashby builds software that lets talent teams build an efficient, delightful, respectful hiring process. Similarly, you’re an engineer who wants to build a “paved road” that excellent engineering teams can safely take to the moon and back. We have notable customers like Notion, Linear, Shopify, and Snowflake. Our growth and retention metrics are best-in-class among our peers: we have tens of millions in ARR, growing >100% year over year, over 2500 customers, very low churn, and many years of runway. We’ll share more details once we meet, but you now probably have a good idea as to why we're hiring for this role 😅. We’ve listed this role twice: as a Platform Engineer and Site Reliability Engineer – our team does both, and we are open to candidates who lean towards one or the other. **About The Role And How We Work** Hi 👋 I’m Colin, Head of EMEA Engineering. I’ve spent a number of years leading engineering teams in startups, and that has always included being close to infrastructure teams - no matter what name they’ve worn (SRE, infrastructure, platform, etc). I’ve got my hands dirty building the initial infrastructure for startups and know the value a talented infrastructure engineer brings. The rigour, the discipline, the peace and quiet when everything just _hums along_. Our infrastructure is in a good place _for now_. Nothing is static. Ashby continues to grow rapidly, putting strain on our existing infrastructure. We’re always looking to give our customers more powerful hiring software, and building new product features often requires new pieces of infrastructure. Having herded plenty of _snowflakeservers_ in the past, I’ve learned there’s a better way. I (and Ashby) place a lot of value on infrastructure-as-code. As a Platform Engineer at Ashby, you’ll get to dive into scaling problems, add new capabilities to our platform, and think about how our entire team interacts with infrastructure. All our own engineers own their projects end-to-end and ship with minimal oversight. We don’t put roadblocks to ensure security when common sense will do and we don’t build processes like change management boards around the lowest common denominator. But with great power comes great responsibility: we handle personal and confidential data about some of the biggest decisions we ever make at work. As we grow, more and bigger customers rely on us to be reliable and secure and how we operate internally will need to evolve. We’re at an inflection point where our ability to scale and deliver a seamless experience has a make-or-break impact – we have some of the fastest growing companies using our platform every day to hire hundreds of people per month. We need someone like you to make good decisions, debug thorny issues, and build us a future-proof platform that can withstand this scale. Our small but mighty infrastructure team has set up a secure and simple environment (we don’t believe in spinning up a new service unless necessary!) for our growing product team to build in. That’s where you come in: you, too, will own projects end-to-end and have an impact on core parts of the Ashby developer and user experience. For instance, you could work on:

*   Optimize our homegrown ultra-dynamic recruiting DSL-to-SQL compiler, and create tools to help developers do so
*   Create automated guardrails for the security and privacy of our customer data
*   Help our developers ship features fast through canary deploys, gradual rollouts and feature flags, while keeping complexity manageable and reducing downtime
*   Work with the business and the engineering team to define SLOs and implement the corresponding SLIs.
*   Ensure all communication with external services supports retries and circuit-breakers.
*   Implement the infrastructure to support an event-driven architecture and data warehouse.

We’re looking for someone who can build systems that an engineer would like to work with: mature and boring but open-minded and approachable. We have to balance reliability with flexibility. Software and its availability are now mission critical to almost every working professional. To be in an SRE in today’s world, you have to be extremely comfortable evaluating risk, those you take and those others take. Why you should or shouldn’t apply **You Should Apply If**

*   You never stop. You get weirdly obsessed about a problem that doesn’t yet make sense, turn it every which way in your head until the explanation dawns. You’ll search every rock, inventory every clue, hunt every mismatch. We do that, too - together we’ll be armed with state-of-the-art monitoring tools and an impressive amount of data, and join you in the adventure.
*   You don’t take shortcuts. You’re speaking up for the future user, the edge case, the doomsday design. You know product engineers want to build it with you, and see them as allies, where you give them the power and knowledge to access greater things.
*   You’re someone who cares about what you do and the team you do it with, and want to work with others who do as well. You’ll be on interview panels choosing your next colleagues, and you’ll take that seriously. You only want to work with people who make you better, and want to make you better.
*   You’ve built infrastructure at a slightly later stage than Ashby is at - you know how to deal with millions of data points, have seen great (or not great) infrastructure make or break customer experience, and have automated everything from provisioning to monitoring and release process.
*   You’re a Swiss army knife (all nationalities welcome ;) ). You’ll get every hard problem the company faces. You’ll get to do infrastructure updates, security enforcements, database optimization, Kubernetes debugging, and digging through Typescript traces figuring out what doesn’t work. You probably don’t feel like an expert at at least some of that... and that appeals to you.

**Role** All that makes for a pretty specific kind of role, and the job isn’t to everyone’s tastes! You should not apply if:

*   You don’t want to make your own decisions on what is the best paved road to build for Ashby, and expect a lead or manager to make the final call on what that is. Our leads (and managers) give ample commentary and feedback on technical decisions and how they’re made, but you ship what you want to build and are accountable for it.
*   You hate SQL. We have a lot of features built around making the best out of data, and our platform engineers also sometimes dive into a gnarly report or advise engineers on a more performant data model to use.
*   You don’t want to code. Our SREs are some of our best software engineers and they are just as responsible for the application as the other engineering teams - albeit at a platform level. Reviewing code and submitting code changes will be part of your day to day.
*   Your primary mode of communicating best practices to engineers is live meetings. We’re a very async culture and written communication (and code) is how changes get made. As an Ashby SRE, you will need to share new tooling and best practices with engineers faster than your next meeting opportunity will take you.
*   You’ve never delivered a project, on your own, without someone prodding you for updates. We have no project or delivery managers to fill your calendar with busy work, but the flip side is you have to do your project management, seek the help you need to get unstuck and cut scope when it’s worthwhile.

Technology Stack I’m sharing our tech stack with the caveat that we don’t require previous experience in it: TypeScript (frontend & backend), Node.js, React, Apollo GraphQL, Postgres, Redis. We use Datadog and Sentry on 100% cloud-based (AWS) infra. We take developer experience and reliability seriously: all engineers are on call in a follow-the-sun model, and everyone contributes to developer tooling. What We’re Building As engineers, we are used to tooling that makes us **better** at what we do. When we started Ashby, we saw the opposite with Talent Acquisition software. Recruiting teams were leveling up how they did their work, but instead of software meeting this new standard, it held them back. Scheduling a final round is an excellent example. Recruiting teams wanted to schedule candidates faster, track interviewer preparation and quality, and do it with half the headcount. A recruiter needed to manually collect availability from the candidate, identify qualified interviewers, perform “Calendar Tetris” to find who is available to interview the candidate, schedule on the earliest date possible, and make any last-minute adjustments as availability changed. They must do this while considering the interview load on each individual and whether interviewers need to be trained and shadowing others. 🥵 TA software didn’t help. As hiring managers, we know TA is a critical function, and as engineers, we know software can do better. So, we built and continue to build Ashby to give TA teams the _highest_ standard of tooling. Software that’s intelligent and powerful. Software that provides insights into where they’re failing and automates or simplifies many of the tasks they’re underwater with. We want other functions and departments to be jealous of what TA teams can do with Ashby, and today they often are! Engineering Culture Our Engineering Culture Is Motivated By Abhik And Benji’s (our Co-founders) Belief That a Small Talented Team, Given The Right Environment, Can Build High-quality Software Fast (and Work Regular Hours!). We Do It Through

*   Minimal process with ownership over decisions normally made by product and design
*   Natural collaboration and deliberate communication
*   Investing in tools and abstractions that give us leverage
*   Putting effort into building a diverse team

**Minimal Process & Lots of Ownership** The best engineers we’ve worked with delivered reliably magical outcomes. They took customer problems and relentlessly drove them to solutions that were not only successful but often brilliant and creative. While they did this with minimal oversight, stakeholders were never in the dark as to what was going on, and no setback was a surprise. Traditional product-development processes aren’t meant for the best engineers. Their purpose is to create consistent outcomes regardless of the engineer’s skill. But, consistency comes at the expense of an engineer’s time and freedom—both ingredients necessary to generate those magical outcomes. As a result, process stifles the best engineers and doesn’t give others the opportunity to practice the behaviors that made the best engineers the “best.” At Ashby, we want to build an environment that encourages every engineer to be their best. So, at Ashby, every Engineer runs their project. Product Managers (and Designers) build strategy, do customer research, and hand off problem briefs to Engineers. Engineers take on the rest: they research the problem, write product specs, build wireframes, and implement their solution end-to-end. We rely on engineers, not process, to push information outward to the relevant folks (e.g., Product Managers) and pull folks in to help (e.g., Designers, Infra). It’s a new level of ownership for many engineers, but we’d rather an engineer fail a bit and coach up their skills than use process as a crutch. Not everyone succeeds in our culture, but those who do _thrive_. **Collaboration is Natural & Communication is Deliberate** Our engineering team consists of lifelong learners who are talented but also humble and kind (meet them here!). These attributes create an environment where collaboration happens naturally. We combine this with research, prototyping, and written proposals to see around corners and get feedback from the team across time zones. Focus time is something that we hold sacred, and, with thoughtful and deliberate communication, engineers are in <2h meetings per week (Abhik wrote about it here). To drive it home, here's a recent calendar of an engineer who has been with us for over 4 years: We also meet in person at least twice a year, once as a department and once as a company. You also have a small budget to meet up with folks in your city/region. **Increase Leverage, not Team Size** We Built Ashby With The Quality, Breadth, And Depth That Many Customers Would Expect From Much Larger Teams Over Larger Time Scales. We’ve Done This Through Investment In

*   Great developer tooling. Our CI/CD takes ~10m, and we deploy at least 15x a day. A debugger that works out of the box. Everyone on the team has contributed to our developer experience 💪🏾.
*   Building blocks to create powerful and customizable products fast. At the core of Ashby is a set of common components (analytics modeling and query language, policy engine, workflow engine, design system) that we constantly improve. Each improvement to a common component cascades throughout our app (short video below).

**And a Demo Of One Of These Building Blocks** Here’s an impromptu quote from Arjun in our company Slack of what it’s like to build a feature at Ashby: **Put Effort into Diversity** Diverse teams drive innovation and better outcomes. Having seen my mother and partner build their careers as minority women in non-diverse fields, I want to make sure Ashby creates opportunities for the next generation of engineers from underrepresented groups. Today, 21% of engineers at Ashby are from underrepresented groups. It’s not great, and we are taking conscious steps to improve, like sourcing diverse candidates, providing generous paid family leave, no leetcode interviews, and more. Interview Process At Ashby, our team and interview process want to help you show your best self. We’ll dive into past projects and simulate working together via pair programming, writing product and tech specs collaboratively, and talking through decisions. There are no leetcode or whiteboard exercises. **Our Interview Process Is Three Rounds**

*   Introduction call with Hiring Manager (15 to 30m, live)
*   A technical screen where we pair in our actual codebase (1h, live)
*   Three non-coding interviews that focus on technical design, debugging incidents, and infrastructure (3h 15m, live can be split across multiple days)

Depending on our leadership team’s bandwidth, we may start with an _additional_ 30m screen with a recruiter. Your hiring manager will be your main point of contact and prep you for interviews. Each round will have written guidance so you know what to expect (you’ll need minimal preparation). You’ll meet 4 to 6 people in engineering (with 5-15 minutes in each interview to ask them questions). If we don’t give an offer, we’ll provide feedback! **Your First Three Months at Ashby** We want an exceptional onboarding experience for every new hire. At Ashby, your dev environment is set up with a single script, you push your first product change on day one, and you spend the rest of your time shipping product changes that give you a tour of our codebase and best practices. The product changes increase in scope and ambiguity from simple copy changes to the delivery of a prominent, impactful feature. Your manager will do a 30, 60, and 90-day review to give feedback and calibrate on how we work together. It’s a team effort to get you successfully onboarded; you’ll have a peer paired with you to answer questions, pair program, and check in often to see if you need help. The rest of the team will run training sessions on our culture, product, engineering process, and technical architecture. **Benefits**

*   Competitive salary and equity.
*   10-year exercise window for stock options. You shouldn’t feel pressure to purchase stock options if you leave Ashby —do it when you feel financially comfortable.
*   Unlimited PTO, and we will encourage you to take it.
*   A minimum of 12 weeks of fully paid parental leave, covered by Ashby. For folks outside the US, it may be longer to be in line with regional requirements.
*   Generous equipment, software, and office furniture budget. Get what you need to be happy and productive!
*   $100/month education budget with more expensive items (like conferences) covered with manager approval.
*   If you’re in the US, we offer top-tier health insurance for you and your dependents, with 100% of premiums covered by Ashby. In other countries, we provide high-quality supplemental health insurance for you and your dependents, also fully covered by us.

Ashby’s success hinges on hiring great people and creating an environment where we can be happy, feel challenged, and do our best work. We’re being deliberate about building that environment from the ground up. I hope that excites you enough to apply. _Ashby provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, sex, national origin, age, disability, genetics, sexual orientation, gender identity, or gender expression. We are committed to a diverse and inclusive workforce and welcome people from all backgrounds, experiences, perspectives, and abilities._

Staff Platform Engineer, UK

We're working with a century-old innovation powerhouse that has evolved into a leading enterprise SaaS platform on this exciting opportunity. Fuelled by over 100 years of stability and forward-thinking investment, this organization is scaling its cloud-based ecosystem. We are looking for a talented Full Stack Developer to take ownership of end-to-end SaaS solutions using the latest .NET Core and SQL Server technologies in a 100% remote environment. **The Role**

*   Architect and deploy scalable software solutions within a modern SaaS cloud-based environment using C# and .NET Core.
*   Drive the development of high-performance front-end and back-end components to ensure a seamless user experience.
*   Collaborate in an Agile environment, actively participating in code reviews, sprints, and technical troubleshooting to ensure code quality.
*   Optimize complex database performance, working with large-scale data processing and sophisticated SQL architectures.
*   Stay at the cutting edge of the .NET ecosystem, integrating new cloud-based resources to maintain a competitive advantage.

**What You'll Need**

*   4+ years of proven experience as a Full Stack Developer, specifically within enterprise-level SaaS environments.
*   Expert-level proficiency in the .NET development platform, including C#, ASP.NET, and .NET Core.
*   Strong SQL Server skills with the ability to write and debug complex queries, views, functions, and stored procedures.
*   Hands-on experience managing and processing large, complex data sets for high-traffic applications.
*   A proactive, Agile mindset with a passion for clean, maintainable code and industry best practices.

**What's On Offer**

*   Competitive salary of £50,000 - £55,000 with a fully remote work-from-home model.
*   Comprehensive growth support, including access to professional training courses and funding for qualifications.
*   Robust benefits package including 25 days holiday (plus Bank Holidays), Health Cash Plan, and a dedicated Employee Assistance Programme.
*   Long-term security with a Company Pension Scheme, Death in Service benefits, and unique Service and President Awards.

**Apply via Haystack today!**

Full Stack Developer II

**.NET Developer, .NET 10.0, C# 14, Agile - Derby**

(Tech stack: .NET Developer, .NET 10.0, ASP.NET Core, C# 14, Blazor, JavaScript, React, Microservices, Azure, ASP.NET Core Web API, Agile, Azure SQL, Programmer, Full Stack Engineer, Architect, .NET Developer)

We are pleased to announce the arrival in the UK of one of Silicon Valley’s most successful and exciting brands. They’re at the heart of the Internet, helping the most innovative companies remove the complexities of delivering any experience, to any device, anywhere.

Having setup an R&D centre in the UK they are looking to hire several .NET Developer at all levels who are passionate about developing revolutionary software solutions. .NET Developer applicants should have commercial experience with: .NET, .NET Core, C#, Azure SQL and Agile. Full training will be provided into: .NET 10.0, C# 14, Blazor, JavaScript, React, Microservices, Azure, ASP.NET Core Web API, Agile, Azure SQL, Node.js, Elasticsearch and MongoDB.

If you are dedicated to the youthful optimism of problem solving through intellectual curiosity, collaboration and commitment this could be the role for you. Our client is growing quickly. If you’d like to work in a culture where hard work and innovative ideas are consistently rewarded, join them and help shape the future of the hyperconnected world.

**Location**: Derby, UK / Remote Working

**Salary**: £45,000 - £60,000 + Bonus + Pension + Benefits

Applicants must be based in the UK and have the right to work in the UK even though remote working is available.

Noir continues to be the leading Microsoft recruitment agency; we can help you make the right career decisions!

NOIRUKNETREC

NOIRUKREC

NC/NET/DERET

.NET Developer - Derby

_**hackajob** is collaborating with **Sporty Group** to connect them with exceptional professionals for this role._ **About The Role** In this role, you’ll be responsible for developing mobile-first, responsive front ends that are used millions of times per day. Our Vue.js frontend is built on a clean, modern architecture and maintained with the same care we bring to every part of our product.A willingness to work in VueJS is fine - as long as you are willing to learn and have demonstrable experience in a similar frontend framework. **Our Stack**

*   Vue + Vuex + Vue Router + Webpack + Less + SCSS + Typescript Playwright
*   Element UIFreeMarker
*   AWS, Jenkins, K8s

**What You'll Be Doing**

*   Develop mobile-first frontends in VueJS
*   Focus on performance and user experience
*   Create frontends for the backend management systems
*   Participate in code reviews with peers and managers to ensure that each increment adheres to original vision as described in the user story and all standard resource libraries and architecture patterns as appropriate
*   Participate in team ceremonies including planning, grooming, product demonstrations, and team retrospectives
*   Mentoring less experienced team members

**What You'll Bring**

*   Minimum of 4+ Years within a relevant role
*   Familiarity with at least one: Vue, React, Angular
*   Familiarity with Git, ES6, Webpack, Less or Sass, and NodeJS
*   Familiarity with state management like Vuex, Redux, Ngrx
*   Excellent communication skills Even better if you have
*   Knowledge of backend stack (Java, SpringBoot)

**What’s in it for you**

*   Sporty is a remote first company in pursuit of sustainability
*   A competitive salary + individual performance based bonuses every quarter
*   28 days paid annual leave
*   Our core working hours are 10am-3pm in your local time zone with flexibility outside of this
*   Referral bonuses & flash bonuses
*   Top of the line equipment
*   Annual company retreats to provide great internal networking opportunities

**Interview Process**

*   Remote video screening with our Talent Acquisition Team
*   Offline Take home assignment
*   Remote video interview with Team Members (60 Mins)
*   Final discussion with the hiring manager (60 mins)

If you're interested, we encourage you to apply! Every application is reviewed by a member of our team (AI is not used in our recruitment process), and we aim to respond within 48 hours.

Frontend Engineer

**Position:** Software Engineering Expert **Type:** Hourly contract **Compensation:** $50–$150 per hour **Location:** Remote **Commitment:** Part-time, approximately 15–25 hours per week (with flexibility to increase) **Role Responsibilities**

*   Review and refine AI-generated prompts, responses, and code
*   Validate algorithms and software concepts for technical accuracy
*   Provide structured feedback on solution quality, correctness, and clarity
*   Tag and organize content by topic, difficulty, or programming language
*   Support benchmarking efforts to assess AI model capabilities

**Requirements**

*   Strong experience in software engineering, technical research, or technical content development
*   Bachelor’s degree in Software Engineering, Computer Science, or a related field
*   Strong experience with one or more programming languages such as Python, JavaScript, Java, or C++
*   Strong experience debugging, testing, and validating code
*   High attention to detail and comfort with technical writing
*   Ability to work independently in a remote, project-based environment

**Application Process (Takes 20 mins)**

*   Upload resume
*   Interview
*   Submit form

Senior Software Engineer (Python | JavaScript | Java) –  Consultant | Remote

We are looking for a professional with Three.js or someone who has experience with other 3D visualization frameworks HTML5 Canvas using Fabric.js.

we do a lot of "mapping" of points of interest, geospatial. Anyone who has done high-performance visualization of 3D graphics / scenes in a browser

**Key Abilities**

Strong communication and organization skills, as well as a "team-first" mentality;

Strong aptitude with technology, including Excel, Google Workspace, Slack, Asana, and other tech tools; and Willingness to learn new skills and technology.

Three.JS Developer | 3D

**Position:** Software Engineer (Front-end) **Type:** Hourly contract **Compensation:** $70–$80/hour **Location:** Remote **Commitment:** 10–40 hours/week **Role Responsibilities**

*   Write realistic, self-contained prompts for client-side web applications, games, tools, and simulations.
*   Create precise, binary evaluation rubrics tagged by verification type.
*   Ensure rubric items are pass/fail and verifiable through screenshot and code inspection.
*   Develop high-quality datasets focused on UI behavior, interactivity, robustness, and state management.
*   Apply frontend engineering expertise to evaluate correctness and user experience.
*   Collaborate asynchronously with research and review teams.

**Requirements**

*   Professional experience in frontend or full-stack development.
*   Strong proficiency in JavaScript, TypeScript, React, or vanilla JS.
*   Ability to write clear technical specifications and structured evaluation criteria.
*   Strong analytical thinking and attention to detail.
*   Comfortable working independently in a remote, deliverables-driven environment.
*   Bachelor’s degree in Software Engineering, Computer Science, or related field preferred.

**Application Process (Takes 20 Min)**

*   Upload resume
*   Interview (15 min)
*   Submit form

React/JavaScript Engineer | $80/hr Remote

**Be | Shaping the Future Poland** has a proven position of being a reliable partner for financial services organisations to analyse complex requirements, find solutions and implement them in their entirety, regardless of their complexity. Since the foundation of **Be Poland in 2013**, we have been continually expanding and customising our spectrum of services.

We are currently looking for a **Front-End Engineer** to work for one of our clients in the payment sector.

**Requirements**:

*   several years of experience as a Software Engineer working with **Flutter**, **native mobile (iOS or Android), or React Native**
*   experience with popular **Flutter libraries, tools and its lifecycle**
*   passionate about building great products in small, autonomous, agile teams
*   automation tests and experience writing testable code
*   experience building sleek, high-performance user interfaces and complex Mobile apps that successfully shipped to customers
*   leveraging automation and toolings, focussed in Continuous Integration, Delivery and Deployment

**Our offer:**

*   Competitive remuneration on B2B contract
*   Access to Mindgram – mental health & well-being platform
*   Free gym at Q22
*   Personal development – internal online / onsite DevTalks
*   Referral bonus program
*   International environment

Frontend Engineer - Payments

Buscamos un/a **Senior Frontend Developer** para unirse a un equipo tech internacional que desarrolla un **SaaS B2B white-label** dentro del sector música/tech.

Rol con impacto real en producto, ownership técnico y liderazgo de frontend.

**Contrato freelance, inicialmente 7 meses, renovables**

🎯 Qué harás

*   Diseñar y desarrollar interfaces web complejas y escalables.
*   Liderar el frontend squad: definir estándares, buenas prácticas y arquitectura.
*   Aportar mentoring y liderazgo técnico.
*   Colaborar con producto, diseño y stakeholders.
*   Asegurar calidad, mantenibilidad y observabilidad del código.

🛠️ Stack & requisitos

*   +5 años de experiencia en **Frontend**.
*   **React** muy sólido.
*   **TypeScript / JavaScript** avanzado.
*   Experiencia real aplicando **Clean Code** y buenas prácticas.
*   Conocimiento del **SDLC** y trabajo orientado a producto.
*   Experiencia con **npm, yarn, webpack**.

➕ Nice to have

*   Conocimientos básicos de backend (**PHP / Symfony**).
*   Testing con **Jest y/o Cypress**.
*   Docker / Kubernetes (nivel conceptual).
*   Observabilidad: **Grafana, OpenTelemetry, GA**.
*   Estar en **Barcelona**.

🧠 Soft skills clave

*   Comunicación clara (tech & non-tech).
*   Proactividad y resolución de problemas.
*   Mentalidad de producto y foco en UX.
*   Buen manejo de prioridades y deadlines.
*   Perfil colaborativo.
*   **Inglés alto (imprescindible)**.

Senior Frontend Developer Freelance

**Salary:20 500 - 24 500 PLN net + VAT (B2B) / 17 000 - 20 500 PLN gross (UoP) + uncapped sales commission (bonus)**

_We don’t follow best practices, we set them!_

**Join a team that’s shaping the future of mobile tech - and sell what truly sells itself.**

We’re not just another software house. We’re a team of top-tier cross-platform development experts, co-creating the future of React Native & AI, being a Founding Member of React Foundation. We collaborate with Silicon Valley startups, Fortune 500 giants, and everything in between. Our name carries weight in the developer community - and that opens doors. Big ones.

**Who we’re looking for?**

We’re on the lookout for a **Senior Business Development Manager** with a hunter’s mindset and a proven track record in closing high-value deals.

We’re looking for someone who gets a thrill from opening doors, starting conversations from scratch, and turning them into six-figure partnerships. Someone who’s strategic, relentless, and knows how to position value - not just pricing.

From day one, you’ll take the lead in driving your own outreach, building relationships, and closing deals with high-profile clients - especially in the US market. You’ll be the face of Callstack at industry-leading conferences and business meetings around the globe, turning interest into opportunity. Your job is to keep the pipeline strong and deals moving.

We’ll back you with a powerful technical brand, support from our marketing and engineering teams, and access to top-tier events. But we’ll also expect you to bring your own ideas to the table - and run with them.

**What’s in it for you?💼 You’re not starting from scratch**

We already work with top-tier enterprise clients. You’ll sell solutions backed by proven delivery, a strong reputation, and the kind of tech talent that Silicon Valley respects.

**🎯 A clear niche and sharp positioning**

We’re laser-focused on cross-platform development. You won’t need to explain who we are - our name carries weight in the React Native ecosystem.

**✈️ You’ll go places - literally**

Attend and represent Callstack at the biggest tech conferences in the US and beyond. We also organize industry-leading events ourselves - and you’ll be part of it.

**🇺🇸 Work with the US market**

Sell to innovation-driven companies where budgets are high, expectations are clear, and value is everything.

**🤖 We’re leaning into AI - and so will you**

We’re actively investing in AI-powered solutions and internal tooling. You’ll be part of shaping how we sell and deliver with tomorrow’s tools.

**📈 Full ownership over deals**

You drive it, you close it, you own it. From the first handshake to the signed contract.

**💡 Challenger Sales training & mindset**

We believe in value-based selling. You’ll get access to training and support to sharpen your consultative sales game.

**🤝 All hands on deck**

You’ll have full access to our tech experts, marketing, and leadership team. We won’t micromanage - but we expect you to make smart use of the support we offer.

**💰 Earn big, close big**

Bring in big deals? You’ll see that reflected in your commission. Simple as that.

**What we offer:**

*   24 paid days off & 30 days paid sick leave for B2B contractors
*   Fully-covered life insurance
*   Private healthcare for you and your family
*   Free access to mental health platform - Helping Hand
*   Multisport Card or monthly allowance for other sports activities
*   Individual Wellbeing & Development Budget
*   Monthly lunch allowance
*   Accounting costs refund for B2B contractors
*   Flexible working hours and fully remote work possibility
*   Sales commission from every deal you complete (no cap)
*   Cool office in Wrocław city center
*   Magnificent team events and activities
*   Company-wide workation and team building workshops
*   Top-notch hardware - Apple devices
*   Possibility to participate in React Universe Conf

Senior JavaScript Developer

Job Description

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hackajob

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