Summary: Join the Mobile Core Framework team to design, build, and maintain native Windows modules in C# for React Native applications, optimizing SDK performance and collaborating with app development teams. Highlights: 1. Design and build native Windows modules in C# for React Native applications 2. Optimize SDK performance focusing on memory, responsiveness, and startup time 3. Collaborate with app development teams for excellent developer experience ### **Description** About osapiens At osapiens, more than **550 talented minds** unite around one mission: enabling sustainable growth for businesses worldwide. Founded in 2018 and headquartered in Mannheim, Germany, we have built the AI\-driven osapiens HUB \- a multi\-tenant platform hosting 26 enterprise\-grade solutions designed for cross\-company collaboration, automation, and compliance. With offices across Europe and the US, **we are shaping the future of scalable and secure business technology.** Your Team Join our Mobile Core Framework team to build and evolve the Windows native layer of our mobile client SDK. You'll design and implement C\#/.NET APIs that bridge native Windows capabilities to React Native for Windows, enabling app developers across the company to build powerful, performant applications for the Windows ecosystem.### **Your Responsibilities** * 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 ### **Your Experience** * 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 ### **Join us for this and more...** * 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 ### **About osapiens** **osapiens** develops holistic Software\-as\-a\-Service solutions that help global companies ensure transparency, efficiency, and trust across their entire value chain. Through its cloud platform, the **osapiens HUB**, the company leverages innovative technologies, including artificial intelligence, to strengthen businesses while promoting human rights, ecological responsibility, and sustainable corporate governance. Founded in 2018 and headquartered in Mannheim, Germany, **osapiens** works with **around 2,000 companies in over 50 countries** across industries such as consumer goods, automotive, fashion, pharmaceuticals, and medical products. The company is backed by **Goldman Sachs** and **Decarbonization Partners**, reinforcing its commitment to responsible, sustainable growth.