Junior .NET Developer

For an international client based in Hamburg, Germany, we are looking for a freelance Junior .NET Developer to join an international software development team. This is a hands-on development role for someone who already has a solid foundation in C#/.NET and web application development and wants to further develop their skills in a modern enterprise environment. The position can be performed remotely. The Role: As a Junior .NET Developer, you will contribute to the development and modernization of business-critical web applications. You will work alongside experienced developers and contribute across both backend and web application development, using C#/.NET, ASP.NET Core and Razor-based user interfaces. The role offers the opportunity to further develop your experience with APIs, databases, containerisation, testing and modern software engineering practices. Core Responsibilities: Develop and maintain applications using C# and .NETBuild and maintain web interfaces using Razor (.cshtml), HTML and CSSDevelop responsive application components using Bootstrap 5Contribute to ASP.NET Core MVC applicationsSupport development and integration of REST APIsWork with relational databases and Entity Framework CoreWrite clean, maintainable and testable codeUse Git and established branching/development workflowsParticipate in code reviews and technical discussionsWork closely with experienced developers within an Agile development environment Required Skills: You do not need to be an expert in the full technology stack. We are specifically looking for a developer who has a good technical foundation and is motivated to develop further. You should have practical experience with: C# / .NETHTML / CSSRazor / .cshtmlBootstrapGitExperience with recent .NET versions is expected; experience specifically with .NET 10 is not required if you have a solid modern .NET background. Preferred / Skills You Can Develop Further: Experience with some of the following would be beneficial: ASP.NET Core MVCREST APIsEntity Framework CorePostgreSQL or another relational databaseSQLJavaScript / jQueryDockerUnit and integration testingCI/CDCode reviews and technical documentationExposure to AWS, microservices, OAuth/OIDC, Microsoft Entra ID, messaging or event-driven architecture is welcome but not required. Profile: We are looking for someone who: Has approximately 1–3 years of professional software development experienceHas already worked with C#/.NET in a commercial environmentEnjoys working across both backend and web application developmentIs comfortable learning from more experienced developersWrites structured and maintainable codeCommunicates well within an international teamHas professional working proficiency in EnglishGerman language skills are beneficial but not required. Practical Details: Location: Hamburg, Germany / RemoteWorking model: RemoteContract type: FreelanceCapacity: Full-time / approximately 40 hours per weekStart: September 2026 / as soon as possibleLanguage: EnglishLevel: Junior .NET DeveloperImportant – Freelance Work Authorization Candidates must already be legally entitled to work as an independent freelancer/contractor within the European Union. This can include EU/EEA/Swiss citizens or non-EU candidates who hold the appropriate residence/work authorization permitting self-employed or freelance activity. Employment-only work authorization is not sufficient for this assignment. No visa or work-permit sponsorship is available for this position.