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.
We’re now looking for engineers who enjoy reviving, scaling, and modernizing high-adoption live games.

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

Requirements

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) (España)
🏢 UserWise Services
📍 España