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September 29, 2026

Mid .NET Backend Developer

Mid • Remote

80 - 95 PLN/yr

Gdańsk, Poland

Quick Facts

  • Role: Software Engineer (.NET) / Mid .NET Backend Developer

Description

You will build and maintain backend services using C# and .NET (ASP.NET Core). Responsibilities include designing and implementing RESTful API interfaces, applying async/await and concurrency best practices, and ensuring performance, scalability, and reliability. You will also work with SQL and MongoDB, ASP.NET Core middleware/request pipeline, and core observability practices.

Responsibilities

  • Develop and maintain backend services with C# and .NET / ASP.NET Core
  • Write clean, maintainable, high-performance code using best practices
  • Design and implement RESTful API interfaces
  • Use async/await and handle concurrent operations correctly
  • Apply Dependency Injection and understand service lifecycles (Singleton/Scoped/Transient)
  • Ensure application performance, scalability, and reliability
  • Work with SQL and MongoDB (querying and optimizing data access)
  • Participate in data migration tasks
  • Work in ASP.NET Core request pipeline and middleware
  • Implement logging and monitoring and support core observability practices
  • Collaborate in an Agile / Scrum environment

Requirements

  • Minimum 3 years of commercial experience with C# and .NET
  • Strong OOP knowledge (interfaces vs abstract classes)
  • Experience with async/await and asynchronous programming concepts
  • Good knowledge of Dependency Injection patterns
  • Knowledge of SQL and MongoDB (relational and NoSQL)
  • Ability to analyze, debug, and troubleshoot performance and logic issues
  • Knowledge of cloud platforms (AWS, Azure, or GCP)
  • Experience with Agile / Scrum
  • Strong communication and analytical skills
  • English at least Upper-Intermediate (B2/C1)

Benefits

  • Remote work: flexibility to work from anywhere
  • Interesting projects matched to your skills and interests
  • B2B contract with no exclusivity clause
  • Career development through work with modern technologies and diverse projects

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