Senior Full Stack TypeScript Engineer

💻 Senior Full Stack TypeScript Engineer – Fintech 📍 remote/b2b/35-45€/h Join a leading fintech company with 25+ years of innovation in the financial markets. Our platform connects participants in repo and securities financing, delivering real-time solutions that enable clients to trade efficiently, accurately, and competitively. We foster autonomous, agile, and technology-driven teams with a strong focus on product excellence, innovation, and collaboration. We are seeking a Senior Full Stack TypeScript Engineer to develop high-performance web applications and backend services, shaping the next generation of fintech solutions. Requirements / Skills Extensive experience with TypeScript & JavaScript (ES6+) Strong Node.js backend expertise Advanced React, HTML5, CSS skills Deep understanding of RESTful APIs (HTTP, JWT, OAuth) Experience with relational databases (PostgreSQL / MySQL) Proficiency with Git, Linux/Unix CLI, npm/pnpm Unit, integration, and E2E testing (Playwright, Cypress, etc.) Web performance optimisation and scalable system design Practical experience using AI-assisted development tools (e.g., GitHub Copilot, Cursor, Claude, Gemini) Strong critical thinking to validate AI-generated code for security, maintainability, and performance Code review, documentation, and mentoring skills Ability to take ownership of complex features and drive delivery English – professional working proficiency Polish – minimum B2 level Location Requirement: Candidates must be physically based within the European Union (EU) Desirable / Plus D3.js (data visualisation) Redux / Zustand / Context API Tailwind / Styled Components Docker / Terraform / AWS Lambda Load testing tools If you thrive in a fintech, innovative, and collaborative environment and want to push the boundaries of financial technology, this role is for you.