Hire the Best iOS Developers
in Japan

Hi! My name is Kyo Yamamoto. I WORK WITH - Self-employed service providers - Business and enterprise companies EXPERINCE IN - Flutter Development (over 1.5year) - iOS Development (over 2.5 years) - Android Development (1 year) - Web Development (2.5 years) OTHER - Flutter Ninjas Speaker 2025

I help clients turn game ideas, prototypes, and existing projects into playable, reliable systems that can be tested, improved, shipped, and maintained. My main focus is Unity game development, including gameplay programming, UI-driven game loops, mobile and WebGL builds, scoring systems, progression, player interactions, content workflows, and production-ready features. I also work on retro and low-level game development, including native C projects for Game Boy, MSX1, and Commodore 64. I work especially well on projects that need more than code implementation. I can help structure the gameplay flow, identify missing requirements, improve usability, troubleshoot technical issues, and make sure the project remains practical to maintain after delivery. What I can help with: • Gameplay systems, interactions, and core game loops • Playable prototypes, MVPs, and vertical slices • Improving, debugging, or completing existing Unity projects • UI, menus, scoring, timers, progression, feedback, and game flow • Mobile, WebGL, desktop, browser, and Linux builds • Retro game development and hardware-constrained gameplay systems • Data-driven content using JSON and CSV • Custom tools and workflows for easier content and asset updates • Bug fixing, optimization, project cleanup, and stability improvements • External service, API, and local AI integration • Controller support, device deployment, and hardware troubleshooting Alongside Unity, I have practical experience with Unreal Engine 5, Godot 4, Construct 3, C, C#, GDScript, JavaScript, Node.js, Rust, Linux, Blender, and Git. My recent independent R&D work includes developing the same retro dungeon prototype natively in C for Game Boy, MSX1, and Commodore 64, with custom sprite, palette, tile, and asset-conversion tools. I have also deployed a Godot game to an ARM64 Linux handheld and built a communication pipeline between a GB Studio ROM, a modified emulator, Node.js, and a local Ollama model. My Upwork history includes shipped mobile games, Unity ports, long-term production work, WebGL builds, prototypes, gameplay systems, and production support across desktop, mobile, and browser platforms. I work best with clients who want a practical developer who can think through both the technical implementation and the game design direction.

Senior iOS developer specializing in React Native, Swift, and native mobile development. Building scalable iPhone apps, iPad applications, and cross-platform solutions. Experienced in iOS SDK, Xcode, App Store deployment, and mobile UI/UX design. Offering iOS development services, React Native consulting, and mobile app optimization. Passionate about iOS performance, security, and user-centric design.