Senior .NET Developer (f/m/x)

We’re looking for experienced .NET Developers to join our growing team. In this role, you’ll help design and build solutions that integrate seamlessly with our existing systems. You’ll work with technologies related to identity management, cloud-based hosting, and healthcare interoperability standards, contributing to projects that make complex systems work smoothly together.

Your tasks

• Designing and developing applications and services in .NET technology

• Designing and maintaining solutions related to identity management and data security

• Working on cloud-based systems and supporting scalable service architecture

• Implementing interoperability standards in the healthcare sector

• Analyzing, diagnosing, and resolving complex technical problems in existing systems

Requirements

• At least 5 years of experience in developing with C# (.NET) and TypeScript

• Hands-on experience with Azure cloud hosting and infrastructure

• Experience in implementing or working with Microsoft Entra External ID (CIAM) or similar identity platforms

• Understanding of HL7 standards and healthcare system integrations

• Knowledge of TLS and other security protocols, as well as secure application design

• Experience with test automation frameworks and automated testing practices

• Ability to design and implement CI/CD pipelines for modern development workflows

• Good English skills

• Residing in Poland required

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 

If you want to work on systems with high operational significance — apply now!