osapiens

Senior Windows SDK Engineer – C#/.NET

osapiens

full-time

Posted on:

Location Type: Hybrid

Location: Mannheim • Germany

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Job Level

Senior

Tech Stack

AndroidAzureiOSJavaKotlin.NETReactReact NativeSwiftTypeScript

About the role

  • Design, build, and maintain native Windows modules in C# that expose platform capabilities (offline sync, background tasks, device integrations) to React Native applications
  • Own the React Native for Windows bridge layer, including native module architecture and XAML components
  • Optimize SDK performance with focus on memory management, responsiveness, and startup time
  • Stay current with Windows platform evolution (WinUI, Windows App SDK, .NET updates) and integrate relevant capabilities into the SDK
  • Build and maintain automated test suites and CI/CD pipelines in Azure DevOps
  • Collaborate with app development teams to understand their needs and provide excellent developer experience
  • Contribute to SDK documentation and versioning strategy

Requirements

  • Strong proficiency in C# and .NET (6.0+)
  • Experience with Universal Windows Platform (UWP) or Windows App SDK development
  • Familiarity with React Native for Windows native module development (or willingness to learn quickly)
  • Solid understanding of async/await patterns, threading, and performance optimization in .NET
  • Experience with Visual Studio, MSBuild, and Windows application packaging
  • English is our working language; fluency in written and spoken English is required
  • Nice to Have
  • Experience building libraries, SDKs, or frameworks consumed by other developer
  • Knowledge of TypeScript and React Native architecture
  • Experience with XAML and WinUI
  • Familiarity with CI/CD pipelines in Azure DevOps
  • Experience with iOS (Swift) or Android (Java/Kotlin) development
Benefits
  • A purpose-driven mission with and for global industry pioneers in tackling complex challenges
  • Room for creativity through collaborative teamwork and an open communication culture
  • Flexibility and team bonding with our hybrid work options
  • Fuel for your growth journey, both personally and professionally
  • Sustainable mobility options, promoting eco-friendly commuting solutions
  • Fun team events and outings with our global teams
  • Inspiring workspaces in Mannheim and beyond
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
C#.NETUniversal Windows Platform (UWP)Windows App SDKReact Nativeasync/await patternsthreadingperformance optimizationXAMLTypeScript
Soft Skills
collaborationdeveloper experiencecommunicationproblem-solving