Senior .NET Developer

Who we are:We are Inspeerity (part of DevelopX group), a modern software house, providing software development, consultancy, and maintenance services. We specialize in full stack development – from defining project requirements, to designing, building, and deploying software applications for web, backend, enterprise and mobile. We are crazy about technology, serious about people.

About position:We are looking for Senior .NET Developers who enjoy collaborating in a skilled team and are committed to delivering top-notch software projects. As our company grows, you will have the opportunity to work on a variety of software solutions across multiple initiatives, from building native AI solutions to modernizing legacy systems.We're not prescriptive about background. Whether you've worked in fintech, SaaS, e-commerce, or enterprise systems, what matters is that you've shipped production software at scale, cared about its reliability, and learned from what broke.TL;DR

• Who: Senior .NET Developer• Contract Type: B2B Framework Agreement• Salary range: Up to 150 PLN/h• Company: Software HouseWhat you’ll be doing:• Designing, implementing, and maintaining high-quality .NET applications.• Developing backend components and APIs to support scalable software solutions.• Collaborating with cross-functional teams.• Reviewing and refactoring code to ensure maintainability, performance, and security.• Participating in technical design discussions and contributing to architecture decisions.• Writing and maintaining technical documentation for systems, APIs, and processes.• Supporting deployment and integration of applications in different environments.

You will be the best fit if you have:• 5+ years of experience as a C#/.NET developer, preferably with exposure to .NET Core / .NET 6+, ASP.NET Core, Entity Framework or similar frameworks.• Strong understanding of object-oriented programming, design patterns, and clean code principles.• Experience with RESTful APIs and web services integration.• Familiarity with SQL and NoSQL databases (e.g., PostgreSQL, MySQL, MongoDB).• Experience with cloud environments such as AWS, Azure, or GCP.• Knowledge of CI/CD pipelines and version control systems (e.g., Git).• Strong problem-solving skills and ability to troubleshoot complex issues.• English level B2 or higher.• Experience working in Agile/Scrum teams and contributing to iterative development.• Experience with AI technologies, including using AI tools for development and building AI-powered features or applications.

What we offer• Remote work or working from our Bialystok, Warsaw, Rzeszow offices. It's up to you!• Collaboration with experienced and engaged people who will appreciate your work and support you whenever you need it 😊• Hybrid and flexible cooperation model based on a B2B Framework Agreement.• Great working conditions and best equipment: Dell or MacBook, your choice.

Good to know:We don’t require a degree. We don’t do whiteboard puzzles or trick questions. Our interview process is practical: a technical conversation, and a chat about how you work.We value direct communication, intellectual curiosity, and low ego. If you’re someone who gets excited debugging a tricky concurrency issue - not because you have to, but because you want to understand it — we’ll get along well.