Senior Frontend Developer

Salary: 900-1200 PLN/day on B2B Work model: hybrid from Gdynia / Gdańsk / Warszawa / Łódź (2/3 days per week from the office)   Why choose this offer? • You can expect a flexible work organization • The international work environment will give you the opportunity to interact with the English language on a daily basis • Scandinavian 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 You will be involved in a financial project focused on building secure, high‑performance, and highly interactive web applications that support complex business workflows, real‑time data processing, and seamless user experiences. You’ll play a key role in shaping the frontend architecture, ensuring code quality, and driving technical excellence across the team.   Responsibilities you'll have • Architect and implement complex, interactive user interfaces and single‑page applications using TypeScript and JavaScript • Define and maintain best practices for frontend architecture, state management, and component reusability • Develop and maintain Web Components using Lit, ensuring modularity and long‑term maintainability • Optimize application performance, improve Core Web Vitals, and ensure smooth experiences across devices and browsers • Collaborate closely with backend engineers, UX/UI designers, and product managers to deliver end‑to‑end product features • Integrate with REST and GraphQL APIs, ensuring reliability, security, and consistency of data flows. • Conduct performance audits, code reviews, and mentor other developers • Contribute to CI/CD pipelines and deployment workflows (nice‑to‑have) • Participate in system design discussions and influence technical decisions across the product   Expected competences and knowledge • Strong expertise in HTML, CSS, JavaScript, TypeScript • Experience with Web Components and Lit • Solid understanding of Node.js and npm ecosystem • Experience writing unit tests with Vitest • Strong knowledge of frontend architecture, design patterns, and performance optimization • Ability to work with REST/GraphQL APIs • Experience in large‑scale, modular frontend codebases • Strong communication skills and ability to collaborate in cross‑functional teams   Technologies you'll work with • TypeScript, JavaScript • Web Components, Lit • HTML5, CSS3, Sass • Node.js, npm • Vitest, Playwright (optional) • REST, GraphQL • CI/CD tools (GitHub Actions, GitLab CI, or similar) • Kafka, MQ systems (nice‑to‑have) • NinjaFork (nice‑to‑have)   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.