Join an international team working for a client in the financial sector as a Node.js Developer. This is a senior-level backend development role focused on building and maintaining robust APIs and server-side logic. You’ll collaborate with experienced engineers and contribute to a well-documented, scalable architecture. The work is mostly remote, but you will attend monthly, two/to three-day meetings in Warsaw.Your tasks Developing and maintaining API endpoints and server-side logic within SvelteKit’s server.js files and form actions Ensuring proper error handling and validation across server-side operations Building database integration layers using PostgreSQL clients Writing SQL queries for CRUD operations and implementing data models aligned with frontend needs Creating unit tests for server-side functions and API routes Participating in code reviews and following established patterns for authentication, authorization, and data fetching Debugging issues across the full stack Contributing to the documentation of API specifications and database schemas Requirements Minimum 5 years of experience with Node.js Strong understanding of backend architecture and API design Experience with PostgreSQL and writing efficient SQL queries Familiarity with unit testing and code review practices Fluent English (spoken and written) Ability to work effectively in an international team Residing in Poland required Fluent Polish required Nice-to-have requirementsExperience with Svelte