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