Senior Frontend Developer

Salary: 900 - 1200 PLN/day on B2B Work model: Hybrid from Warsaw (3 days per week in the office) Contract length: 6 months (October 2026 – March 2027) Why choose this offer? You can expect a flexible work organizationThe international work environment will give you the opportunity to interact with the English language on a daily basisScandinavian organizational culture will provide you with work-life balance, you will gain time for additional training (financed by Jit)The Jit community will bring you a nice time during regular integration meetings Project We are looking for a Frontend Developer to join an Agile team responsible for the development, maintenance, and support of a business-critical web application. The role combines hands-on development with production support responsibilities and offers the opportunity to work on a modernized frontend solution using up-to-date technologies and best practices. Responsibilities You'll Have Develop and enhance a modern React-based web application.Implement new business requirements and improve existing functionality.Support application releases, including preparation, stabilization, and production deployment activities.Provide application support, troubleshoot issues, and resolve defects.Ensure continuity of day-to-day application support during dedicated support periods.Improve code quality and maintain framework dependencies, including remediation of identified vulnerabilities.Collaborate with Backend Developers, Business Analysts, Test Engineers, and end users to deliver effective solutions.Participate in Agile ceremonies, including backlog refinement, sprint planning, reviews, and production support activities. Expected Competences and Knowledge Strong experience with React.js (v18+)Experience with React QueryProficiency in TypeScriptExperience with React Testing LibraryKnowledge of Material UIExperience with Tailwind CSSExperience with React FormSolid understanding of hook-oriented programmingGood communication and collaboration skills Nice to Have Basic knowledge of Java and Spring BootExperience with other TanStack librariesFamiliarity with Jenkins Technologies you'll work with React.js React Query TypeScript React Testing Library Material UI Tailwind CSS React Form Tailwind Java Spring Boot TanStack Libraries Jenkins Client – why choose this particular client from the Jit portfolio? Jit Team has had an over-decade-long relationship with the leading financial group in the Nordic countries, and we are privileged to be our client's premier partner in Poland. At present, over 200 Jit personnel are engaged in the completion of more than 60 projects for this Norwegian major provider of financial services with a global presence and a strong focus on modern technology. Our customer's work atmosphere is epitomized by the Scandinavian culture, which is conducive to people who place emphasis on work-life balance and feedback culture. Furthermore, all projects are executed in international teams, giving constant exposure to the English language. About Jit Team The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts, to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.