Senior Software Engineer (.NET / C# + React)

• Strong, current commercial experience in .NET / C#, especially backend
• Experience with SQL Server or another relational database
• Practice in building and maintaining API, integrations, and asynchronous/queue-based solutions
• Experience with applications running on Azure
• Knowledge of React and TypeScript sufficient for frontend work
• Experience managing functional features from design to production
• Good technical communication skills and ease discussing architecture and design

Nice to have:

• Experience with MongoDB, Redis, SignalR, or Ocelot
• Experience in financial, regulated, tax, or compliance projects
• Mentoring developers or technical leadership experience
• Familiarity with VAT, indirect tax, or tax technology (experience in tax domain not required)

• Development of backend and creation of HTTP APIs
• Implementation of business logic and integrations
• Working with databases and asynchronous processing
• Development of applications operating in Azure environment
• Delivering functionalities spanning multiple system layers
• Occasional frontend development in React / TypeScript
• Participation in designing solutions and technical decision-making
• Conducting code reviews and maintaining code quality
• Supporting less experienced team members

Location: Poland, remote work only Form of cooperation: B2B contract Rate: 900 - 1100 PLN per working day