Mobile Developer (.NET)

Expected, .NET, mobile developement, mobile, C#

About the project, We're building a mobile app that talks to real-world access control and operational systems—secure logins, biometrics, BLE-based access, payments, and reporting, all in one platform. We need a hands-on mobile developer to own the app and ship features fast, working side-by-side with our .NET backend team and directly with the CEO., , This starts as a B2B contract with real potential to grow into a bigger, long-term role—architecture, team leadership, the works—if it's a fit on both sides., , This is a senior-level role only. We need someone with a proven track record—live, shipped apps in production and a portfolio to show it. No juniors, no mid-level, no exceptions.

Your responsibilities, Mobile app features (iOS/Android or cross-platform) — real, production, shipping code., Authentication, biometrics, push notifications, and BLE functionality., API integrations with our .NET/C# backend., Direct input into how the app connects to our customer portal, payments, and reporting, systems., Fast decisions, zero bureaucracy—you work directly with the CEO and core team.

Proven track record: Live apps you've shipped that are currently in production, with a portfolio or App Store/Google Play links to prove it., Strong senior-level commercial experience—this is not an entry-level role., Comfortable working with APIs and collaborating with a backend team (bonus if you know .NET/C#)., Working knowledge of mobile security fundamentals: authentication, permissions, push notifications, and BLE., Independent, clear communicator who delivers., Based in Warsaw or willing to relocate, and available to start immediately.

Optional, NET/C# experience., CRM/CMS experience (e.g. Umbraco)., Access control or IoT/BLE hardware integration experience., Interest in leading a mobile team as the product grows.

Team size, 2+

This is how we work, in house, you focus on a single project at a time, you have influence on the choice of tools and technologies, you have influence on the technological solutions applied, you have influence on the product

Team members, frontend developer, IT administrator

What we offer, $6,000–6,500/month (B2B contract)., Relocation bonus if you're moving to Warsaw., Milestone bonuses for major deliveries (first release, key integrations, platform go-live)., Modern Warsaw office., Direct access to the CEO—your work shapes the product., Fast-moving, low-bureaucracy environment with genuine long-term growth opportunities.

Please include links to live apps or a portfolio with your application. Applications without proof of shipped work will not be considered., , Start immediately. Interview process takes days, not weeks.