.
Senior Node.js Developer (f/m/x)
  • Warsaw
Senior Node.js Developer (f/m/x)
Warszawa, Warsaw, Masovian Voivodeship, Polska
Sii Sp. z o.o.
27. 1. 2026
Informacje o stanowisku

technologies-expected :


  • Node.js
  • TypeScript
  • API

technologies-optional :


  • React.js
  • Vue.js
  • Angular
  • AWS
  • Microsoft Azure
  • Google Cloud Platform

about-project :


  • We are looking for a Senior Node.js Developer to join our Digital Competency Center. With over 1500+ professionals, the unit delivers complex projects for clients from various industries, including banking & finance, life science, retail, and more. We develop modern software, cloud, digital customer experience, and e-commerce solutions, as well as provide support in digital transformation.

responsibilities :


  • Building and maintaining efficient, scalable backend systems
  • Designing and managing high-performance databases
  • Developing APIs for frontend and third-party integrations
  • Ensuring security, data protection, and application performance
  • Diagnosing and resolving technical issues quickly and effectively
  • Collaborating with cross-functional teams to deliver technical solutions
  • Following best practices for code quality, documentation, and version control

requirements-expected :


  • Minimum 5 years of experience with Node.js
  • Very good knowledge of TypeScript
  • Strong understanding of backend architecture and API design
  • Familiarity with unit testing and code review practices
  • Previous experience with Kubernetes, Docker
  • Openness, good communication, attention to detail, ability to work in a team
  • Fluency in English and Polish
  • Residing in Poland required

offered :


  • 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 – you can change them thanks to Job Changer application
  • 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

  • Praca Warszawa
  • Warszawa - Oferty pracy w okolicznych lokalizacjach


    118 949
    17 567