Mobile Engineer (Objective-C / Cocos - Live Game Evolution)

• 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., 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

UserWise, a leading mobile gaming company in Spain, is looking for an experienced Engineer to maintain and enhance a popular mobile game built with Objective-C and Cocos. The role involves optimizing performance and collaborating with product and design teams to achieve impactful results. Candidates should have solid skills in iOS development and familiarity with live game operations. Competitive tax-free USD salaries, Paid Time Off, and performance bonuses are offered., * 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., Objective-C iOS development Cocos Performance optimization AI tools usage Descripción del empleo, * 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)

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

• Paid Time Off
• Performance Bonus
• Annual Performance Reviews

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.