About UsAt User Wise 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 RoleYou'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 usersMaking smart, high-leverage technical decisionsUsing AI tools to accelerate development, debugging, and refactoringWhy This Role Is InterestingWork on a game that already has traction and playersSee your impact immediately in a live environmentUse AI as a force multiplier, not just a buzzwordSolve real engineering problems—not just greenfield abstractionsWho This Is ForEngineers who enjoy fixing, improving, and evolving real productsPeople who like high ownership and fast executionBuilders who prefer impact over perfectionWhat You'll DoMaintain and extend a legacy Objective-C + Cocos codebaseOptimize performance, memory usage, and runtime behavior for mobileRefactor and modernize systems without breaking live operationsShip features, events,



and improvements in a live-service environmentUse AI-assisted workflows (code generation, debugging, refactoring, test creation) to move fasterCollaborate closely with product, design, and analytics to drive impactIdentify quick wins vs. deep tech improvements and prioritize accordinglyWhat We're Looking ForStrong experience with Objective-C and i OS developmentHands-on experience with Cocos (Cocos2d-x or similar)Experience working on live mobile games or shipped appsAbility to navigate and improve legacy codebasesStrong understanding of performance optimization (CPU, memory, rendering)Pragmatic mindset: you know when to refactor vs. shipComfortable leveraging AI tools (e.G., Copilot, Chat GPT, etc.) as part of your workflowNice to HaveExperience with C++ (common in Cocos-based systems)Familiarity with game loops, rendering pipelines, and animation systemsExperience migrating legacy systems to modern architecturesExposure to analytics-driven development (A/B testing, live ops)BenefitsMarket competitive, tax-free USD salariesPaid Time OffPerformance BonusAnnual Performance Reviews

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