About Us At UserWise Services, we build and scale mobile games played by millions worldwide. Our focus is simple: move fast, deliver impact, and use modern tools—including AI-assisted workflows—to accelerate development and iteration.
You'll work on a proven, high-performing mobile game built with Objective-C and Cocos, helping evolve it for the next stage of growth. This is not a "build from scratch" role—it's about:
Work on a game that already has traction and players
See your impact immediately in a live environment
Maintain and extend a legacy Objective-C + Cocos codebase
Optimize performance, memory usage, and runtime behavior for mobile
Use AI-assisted workflows (code generation, debugging, refactoring, test creation) to move faster
Strong experience with Objective-C and iOS development
Experience working on live mobile games or shipped apps
Strong understanding of performance optimization (CPU, memory, rendering)
Experience with C++ (common in Cocos-based systems)
Familiarity with game loops, rendering pipelines, and animation systems
Exposure to analytics-driven development (A/B testing, live ops)
Market competitive, tax-free USD salaries
Performance Bonus
Annual Performance Reviews

📌 Senior Mobile Engineer (Madrid)
🏢 UserWise
📍 Madrid