Senior Fullstack Software Engineer - C# / React

About the role

Appgate's Core team in Gothenburg is looking for a senior fullstack developer to build the Appgate SDP client with C# and React/TypeScript, and to contribute to the Java REST backend. The client lets users connect securely, while the controller manages policies and access decisions. The role spans the client, its C# logic and the Java backend, and involves ownership of substantial features and subsystems.

Key responsibilities

• Develop features for the Appgate client using C#, React/TypeScript and Electron
• Develop features for the Java REST backend
• Investigate and resolve problems across applications, operating systems and networks
• Improve automated testing, developer tooling and build and release workflows
• Shape technical solutions through design discussions, code reviews and cross-team collaboration
• Help shape how the team uses agentic AI tools in development, testing and improvement

Required profile

• Strong professional experience with C#
• Backend development experience, ideally with Java
• Confidence supporting and debugging software across Windows, macOS and Linux
• Good communication skills in English

Required skills

• React, TypeScript and Electron
• Working knowledge of Unix systems
• Interest in writing maintainable code and improving how it is tested and delivered