Backend Developer (.NET / C#)

Backend Developer (.NET / C#)
📍 Hybrid – Gdańsk (3 days remote / 2 days office)
About Cobalt Streamworks
Cobalt Streamworks is an award-winning IT company founded in Sweden, with a strong presence across Norway, Denmark, Germany, Finland, and Poland. We combine Scandinavian work culture with technical excellence, delivering modern, scalable digital solutions for international clients. At Cobalt Streamworks, we believe in collaboration, ownership, and continuous growth. We build strong teams that create meaningful products — and we make sure our people grow along the way.
About the Role
We are looking for an experienced Backend Developer (.NET / C#) to join a cross-functional product team working with complex digital services and large-scale system integrations. This role goes far beyond coding — you will play a key role in analyzing new features, shaping technical solutions, and taking ownership of backend services across the product lifecycle. The backend team is deeply involved in architectural discussions, refinement sessions, operational support, and collaboration across multiple systems and teams. We are looking for someone proactive, communicative, and technically strong, who enjoys solving complex challenges and contributing to product development from both technical and business perspectives.
Your Responsibilities
– Design, develop, and maintain scalable backend solutions using C# and .NET.
– Analyze new features and help define technical solutions together with frontend developers and other stakeholders.
– Take ownership of backend services, including maintenance, operational stability, and incident handling.
– Collaborate closely with multiple teams and systems in a complex microservices-based environment.
– Participate actively in refinement sessions, architecture discussions, and technical decision-making.
– Support and mentor junior developers when needed.
– Contribute to CI/CD processes, testing strategies, and continuous improvement initiatives.
– Work proactively, ask questions, and contribute with solution-oriented ideas.
– Ensure high-quality, maintainable, and well-tested code.
– Be a communicative and supportive team player with a strong sense of ownership.
Must-Have Skills
– 7+ years of experience in backend development.
– Strong expertise in C# and .NET.
– Experience with system design and architecture.
– Experience working with distributed systems and integrations.
– Strong understanding of CI/CD practices.
– Experience with unit testing.
– Experience with Git and pull request workflows.
– Experience working in Agile environments.
– Very good spoken and written English.
– Ability to work independently and take ownership of technical areas.
Nice to Have
– Experience with Java and Spring Boot.
– Experience with Docker and Kubernetes.
– Experience with Linux environments.
– SQL knowledge.
– Experience with AWS.
– Familiarity with GitHub, Jenkins, Jira, and Confluence.
– Experience working with CMS platforms.
– Experience using AI-assisted development tools or AI agents.
– Experience leading smaller teams or acting as a technical role model.
Personal Qualities
– Proactive and solution-oriented.
– Strong communicator who is not afraid to ask questions.
– Empathetic and patient.
– Curious and eager to learn.
– Quick learner with strong analytical skills.
– Good listener and collaborative team player.
– Comfortable working across teams and contributing beyond pure development tasks.
– Interested in taking ownership and influencing technical direction.
Recruitment Process
– Application Review – We review your CV and contact selected candidates.
– Interview with our Recruitment Team (English).
– Technical Interview – Technical deep dive with the customer.
– Final Decision and Offer.