Senior Mobile Developer
Summary
Build and ship production iOS and Android apps for a B2B storage access platform, integrating with .NET/C# backends and Bluetooth Low Energy hardware.
Senior Mobile Developer — B2B Contract | Warsaw | Start Immediately
The Opportunity
This is a senior-level position. Candidates must have a proven track record of building and shipping production mobile applications for iOS and Android. You should be able to demonstrate live applications in the App Store or Google Play, or provide clear evidence of equivalent commercial applications where public links are unavailable.
We are looking for a hands-on Senior Mobile Developer to take ownership of our mobile application, deliver production-ready features, and work directly with the CEO alongside an experienced .NET backend team.
The role starts as a B2B contract, with genuine long-term potential to grow into mobile architecture ownership, technical leadership, and team management as the product and engineering team expand.
What You’ll Build
Production-ready mobile applications for both iOS and Android
Secure customer access and Bluetooth Low Energy functionality for opening storage units
Integration with the company’s .NET/C# APIs and operational systems
Mobile flows for customer accounts, rentals, payments, and access management
Mobile architecture, testing, CI/CD, monitoring, and App Store / Google Play releases
Close collaboration with the CEO and core engineering team, with fast decision-making and minimal bureaucracy
Nice to Have (Not must)
Experience working with .NET / C# backend systems
Familiarity with CRM, CMS, or operational platforms
Experience with access control, IoT devices, smart locks, or hardware integrations
Experience mentoring developers or growing into a technical leadership role
What You Bring
Proven track record: Live mobile applications currently in production with App Store, Google Play, or portfolio links
Strong 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
What's In It for You
$6,000/month (B2B Contract)
+ Relocation bonus for candidates moving to Warsaw
+ Rewarding Milestone bonuses for product deliveries
OnSite New 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.