Senior Mobile Developer
Senior Mobile Developer — B2B Contract | Warsaw | Start Immediately
$5,500—$6,000/month · Full-time · In-office · Relocation Bonus · Milestone Bonuses
On-site role only!
The Opportunity
We're building a modern mobile application that connects to real-world access control and operational systems—secure authentication, biometrics, Bluetooth Low Energy (BLE), payments, and reporting.
We're looking for a hands-on Senior Mobile Developer to own the mobile application, ship features quickly, and work directly with our CEO alongside an experienced .NET backend team.
This starts as a B2B contract with genuine long-term potential to grow into architecture, technical leadership, and team management as the product expands.
This is a senior-level role only. We require someone with a proven history of shipping production mobile applications. Applicants must be able to demonstrate live apps currently available in the App Store or Google Play. Junior and mid-level candidates will not be considered.
What You'll Build
- Mobile applications (iOS, Android, or cross-platform) built for production
- Work on Authentication, biometrics, push notifications, and BLE functionality
- API integrations with our .NET/C# backend team
- Customer portal, payments, and reporting integrations
- Work directly with the CEO and core engineering team with fast decision-making and minimal bureaucracy
What You Bring
- Proven track record: Live mobile applications currently in production with App Store, Google Play, or portfolio links
- Strong senior-level commercial mobile development experience
- Experience integrating APIs into production mobile applications
- Knowledge of authentication, permissions, push notifications, mobile security, and Bluetooth Low Energy (BLE)
- Ability to work independently and deliver high-quality software
- Based in Warsaw or willing to relocate
- Available to start immediately
Nice to Have (Not must)
- .NET / C# basic experience
- CRM/CMS basic experience (e.g. Umbraco)
- Access control or IoT integration experience
- Bluetooth Low Energy (BLE) hardware basic experience
- Interest in growing into a technical leadership position
What's In It for You
- $5,500—$6,000/month (B2B Contract)
- Relocation bonus for candidates moving to Warsaw
- Milestone bonuses for major product deliveries
- Modern office in Warsaw
- Direct access to the CEO
- Fast-moving environment with minimal bureaucracy
- Long-term career growth as the engineering team expands
Applications without proof of shipped production apps will not be considered.
Start immediately.
Interview process takes days, not weeks.