Senior/Lead JavaScript Developer

Join our team in Warsaw, where we’re collaborating on a cutting-edge fintech venture with a global industry leader. Together with our Partner – Klarna, we’re building an IT hub designed to drive innovation in digital payment solutions. We’re on the lookout for top-tier engineers who thrive in dynamic, forward-thinking environments. Spyrosoft is leading the recruitment process, facilitating a seamless experience for candidates who are ready to shape the future of online shopping and payments.

This opportunity is ideal for engineers who value independence, proactiveness, and flexibility. Our engagement begins with a B2B contract through Spyrosoft, transitioning to a direct contract with our Partner.

We offer a hybrid work model in Warsaw’s vibrant Wola district. English fluency and eligibility to work in Poland are essential, as is the successful completion of a background check to meet the rigorous standards of the financial domain.

Our process:

• CV selection
• Initial recruitment screening
• Technical interview
• Online logic test
• Cultural fit interview

Requirements:

• Minimum 5 years of experience in JavaScript/TypeScript
• Proficiency with React.js (front-end) or Node.js (back-end), Redux (state management), Context API, Hooks
• CI/CD experience, experience with npm or yarn, familiarity with Webpack, Babel
• Experience with NoSQL databases (MongoDB, Firebase), SQL, handling databases in backend systems using Node.js
• Familiarity with serverless architecture (e.g. AWS)
• Frontend: Focus on scalability, performance, state management, and API integration in React.js
• Backend: Focus on designing scalable, event-driven systems with Node.js
• Discuss approach to debugging, refactoring, and writing clean, testable code
• Experience with AWS services and cloud infrastructure