Senior .NET Developer

Who we are:
We are Inspeerity (part of DevelopX group), engineering consultancy providing software development and consultancy. Our primary expertise is systems architecture and 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 currently building our talent pool for future Senior .NET Developer roles. As our company is expanding, you may have the opportunity to work on a variety of software solutions across multiple initiatives, including projects we will be delivering in the future, from building native AI solutions to modernizing legacy systems. If you enjoy collaborating in a skilled team and are committed to delivering top-notch software, we’d love to connect.
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 House

What 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 and intellectual curiosity. 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.