Senior Node.js Developer

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 requirements

• Experience with Svelte

What we offer 

• Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas 

• Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market 

• We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 

• Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more 

• Comfortable workplace – class A offices or remote work 

• Dozens of fascinating projects for prestigious brands from all over the world 

• PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers 

• Investment in your growth – meetups, webinars, training platform and technology blog – you choose 

• Fantastic atmosphere created by all Sii Power People 

Join the Sii team – develop your skills, gain experience, and build your career!