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Fullstack Developer –.NET and React.js
  • Katowice
Fullstack Developer –.NET and React.js
Katowice, Katowice, Silesian Voivodeship, Polska
Sii Sp. z o.o.
24. 7. 2025
Informacje o stanowisku

technologies-expected :


  • .NET
  • React.js
  • TypeScript
  • C#
  • PostgreSQL
  • Oracle
  • Entity Framework
  • GitLab
  • Docker
  • Kubernetes
  • AWS

about-project :


  • Are you a skilled .NET Developer with a knack for front-end work in React, eager to take on new challenges in a global environment? Would you enjoy combining hands-on coding with occasional travel to the U.S., including a 2-week onboarding in beautiful North Carolina? If so, this opportunity might be just what you’re looking for!
  • Sii is collaborating with a U.S.-based technology company specializing in enterprise monitoring and observability solutions. Known for their modern approach and highly scalable products, their tools are used by major organizations worldwide to ensure reliability, performance, and real-time insights across complex systems.
  • In this role, you’ll join a dynamic, cross-functional team and contribute to impactful products with global reach. If youre excited about .NET, React, and the chance to work internationally—apply now!

responsibilities :


  • Leading the design and development of complex, scalable web solutions using OOP principles and technologies such as React (TypeScript) and .NET (C#)
  • Ensuring engineering excellence by writing clean, testable code and ensuring thorough unit testing
  • Applying test-first approaches like test-driven development (TDD) and behaviour-driven development (BDD) beyond unit tests
  • Collaborating closely with product managers to define software functionality
  • Working with architects and UX designers to implement system architecture and designs
  • Engaging with other stakeholders to align on software requirements and solutions

requirements-expected :


  • At least 7 years of experience in software development, with at least 4 years focusing on a commercial software product
  • Expert-level knowledge of React (TypeScript), and .NET (C#), with a strong understanding of OOP principles and design patterns
  • Proficiency with relational databases (e.g., PostgreSQL, Oracle) and ORM frameworks (.NET Entity Framework)
  • Experience setting up CI/CD pipelines (GitLab CI/CD) and utilizing DevOps practices
  • Knowledge of microservices architecture and containerization, e.g., Docker, Kubernetes
  • Familiarity with cloud platforms, e.g., AWS
  • Previous work with cross-functional teams and various stakeholders

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 60M 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 Katowice
  • Katowice - Oferty pracy w okolicznych lokalizacjach


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