Senior Frontend Developer (React)

Who we are:
We are the company (part of DevelopX group), engineering consultancy providing software development and consultancy. Our primary expertise is systems architecture and full stack development – from defining project requirements, to designing, building, and deploying software applications for web, backend, enterprise and mobile. We are crazy about technology, serious about people.

About position:
We are currently building our talent pool for future Senior Frontend Developer (React) roles. As our company is expanding, you may have the opportunity to work on a variety of software solutions across multiple initiatives, including projects we will be delivering in the future, from building native AI solutions to modernizing legacy systems. If you enjoy collaborating in a skilled team and are committed to delivering top-notch software, we’d love to connect.

e're not prescriptive about background. Whether you've worked in fintech, SaaS, e-commerce, or enterprise systems — what matters is that you've shipped production software at scale, cared about its reliability, and learned from what broke.

TL;DR
• Who: Senior Frontend Developer (React)
• Contract Type: B2B Framework Agreement
• Salary range: Up to 140 PLN/h
• Company: Software House

What you’ll be doing:
• Designing, implementing, and maintaining high-quality frontend applications using React.
• Building modern, responsive user interfaces and reusable components.
• Working with frameworks like Next.js to deliver performant, scalable applications (including SSR/SSG when applicable).
• Collaborating with cross-functional teams including backend developers, designers, and product stakeholders.
• Reviewing and refactoring code to ensure maintainability, performance, and scalability.
• Participating in technical design discussions and contributing to frontend architecture decisions.
• Writing and maintaining technical documentation for components and frontend processes.
• Supporting integration with backend services and APIs.

You will be the best fit if you have:
• 5+ years of experience as a Frontend Developer, with strong expertise in React.
• Strong understanding of JavaScript / TypeScript, HTML5, and CSS3.
• Experience building applications with frameworks such as Next.js, including server-side rendering and static generation.
• Experience with state management approaches (e.g., Redux, Zustand, or similar).
• Experience with RESTful APIs and integration with backend services.
• Familiarity with modern frontend tooling (e.g., Vite, Webpack, npm/yarn).
• Knowledge of performance optimization techniques and building scalable web applications.
• Experience with testing frameworks (e.g., Jest, React Testing Library, Cypress or similar).
• Knowledge of CI/CD pipelines and version control systems (e.g., Git).
• Strong problem-solving skills and attention to detail.
• English level B2 or higher.
• Experience working in Agile/Scrum teams and contributing to iterative development.
• Experience with AI technologies, including using AI tools for development and building AI-powered features or applications.

What we offer
• Remote work or working from our Bialystok, Warsaw, Rzeszow offices. It's up to you!
• Collaboration with experienced and engaged people who will appreciate your work and support you whenever you need it 😊
• Hybrid and flexible cooperation model based on a B2B Framework Agreement.
• Great working conditions and best equipment: Dell or MacBook, your choice.

Good to know:
We don’t require a degree. We don’t do whiteboard puzzles or trick questions. Our interview process is practical: a technical conversation, and a chat about how you work.
We value direct communication and intellectual curiosity. If you’re someone who gets excited debugging a tricky concurrency issue - not because you have to, but because you want to understand it — we’ll get along well.