Senior Sofware Engineer (Backend) .NET

Senior Software Engineer – .NET (Backend)

Location: Kraków, Poland

Working model: Hybrid – 4 days (in-office)

Level: Senior

Department: Engineering

Love solving complex engineering challenges and building software that scales?

Let’s build something great together - Join an international engineering team creating enterprise SaaS products used by customers around the world.

We’re looking for a Senior Backend Engineer who enjoys tackling technical challenges, sharing ideas and turning thoughtful design into reliable, high-performing software.

Working with C#, .NET, ASP.NET Core, microservices and AWS, you’ll help shape secure, resilient backend platforms—and have a voice in the technical decisions behind them.

What You’ll Be Doing

• Build and evolve high-performance backend services using C# and .NET.
• Design secure, reliable RESTful APIs that power our products.
• Develop microservices and cloud-native applications on AWS.
• Solve challenges in performance, scalability, reliability and security.
• Work closely with Product Managers, Architects and Frontend Engineers to bring ideas to life.
• Help shape architecture and technical design through open discussion and practical recommendations.
• Share knowledge through thoughtful code reviews and champion strong engineering practices.
• Build automated unit, integration and end-to-end tests that support confident releases.
• Improve CI/CD pipelines and deployment automation.
• Investigate production issues and turn what you learn into lasting improvements.
• Tackle technical debt and keep our systems maintainable as they grow.

What You’ll Bring

• 5+ years of professional backend software development experience.
• Experience building enterprise web applications or cloud-based SaaS platforms.
• A strong understanding of the full software development lifecycle.
• Strong hands-on experience with C# and .NET 6+, ASP.NET Core, ASP.NET MVC / Blazor, Entity Framework and SQL Server.
• Experience designing and building RESTful APIs, microservices, distributed systems and event-driven architectures.
• A solid understanding of secure API development.
• Commercial experience with AWS and cloud-native development.
• Strong system design skills, with an understanding of scalability, distributed computing and performance engineering.

Bonus Points For

• AWS: Lambda, API Gateway, DynamoDB, RDS / SQL Server and Elasticsearch.
• DevOps: Terraform, GitHub Actions, TeamCity, Docker, Kubernetes and CI/CD.
• Observability: Monitoring, logging, metrics and distributed tracing.
• Architecture: Serverless solutions, high-volume distributed systems and backend services supporting React applications.

How We Work

We value engineers who ask good questions, take ownership and enjoy working through complex problems together. Clear communication, constructive feedback and a willingness to keep learning are central to how we build.

You’ll join a collaborative international team where you can share your expertise, influence technical direction and work with modern cloud-native architectures and distributed systems.

Ready to help shape what we build next? Apply now or get in touch - we’d love to hear from you.

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