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. The Role

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: Improving a live product with real users Making smart, high-leverage technical decisions Using AI tools to accelerate development, debugging, and refactoring Why This Role Is Interesting

Work on a game that already has traction and players See your impact immediately in a live environment Use AI as a force multiplier, not just a buzzword Solve real engineering problems—not just greenfield abstractions Who This Is For

Engineers who enjoy fixing, improving, and evolving real products People who like high ownership and fast execution Builders who prefer impact over perfection What You'll Do

Maintain and extend a legacy Objective-C + Cocos codebase Optimize performance, memory usage, and runtime behavior for mobile Refactor and modernize systems without breaking live operations Ship features, events,



and improvements in a live-service environment

Use AI-assisted workflows (code generation, debugging, refactoring, test creation) to move faster Collaborate closely with product, design, and analytics to drive impact Identify quick wins vs. deep tech improvements and prioritize accordingly

What We're Looking For

Strong experience with Objective-C and iOS development Hands-on experience with Cocos (Cocos2d-x or similar) Experience working on live mobile games or shipped apps Ability to navigate and improve legacy codebases Strong understanding of performance optimization (CPU, memory, rendering) Pragmatic mindset: you know when to refactor vs. ship Comfortable leveraging AI tools (e.g., Copilot, ChatGPT, etc.) as part of your workflow Nice to Have

Experience with C++ (common in Cocos-based systems) Familiarity with game loops, rendering pipelines, and animation systems Experience migrating legacy systems to modern architectures Exposure to analytics-driven development (A/B testing, live ops) Benefits

Market competitive, tax-free USD salaries Paid Time Off Performance Bonus Annual Performance Reviews

📌 Senior Mobile Engineer (Objective-C / Cocos - Live Game Evolution) (Madrid)
🏢 UserWise
📍 Madrid