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in Japan

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 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 • Data-driven content using JSON and CSV • Custom tools and workflows for easier content 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#, GDScript, JavaScript, Node.js, Rust, Linux, Blender, and Git. My recent independent R&D work includes deploying a Godot game to an ARM64 Linux handheld and building 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.

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

🤝𝐋𝐞𝐭'𝐬 𝐛𝐮𝐢𝐥𝐝 𝐬𝐨𝐦𝐞𝐭𝐡𝐢𝐧𝐠 𝐠𝐫𝐞𝐚𝐭 𝐭𝐨𝐠𝐞𝐭𝐡𝐞𝐫! 🏅5+ Years of hands-on experience in Full-Stack Development & Business Automation🏅 I am a Senior 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 & 𝐀𝐈 𝐚𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧 𝐄𝐱𝐩𝐞𝐫𝐭 specializing in AI-powered web and mobile applications, automation, and scalable cloud solutions for startups and enterprises. My expertise spans the latest frontend, backend, and mobile frameworks, robust cloud deployments, and advanced AI integrations—delivering secure, high-performance software tailored to your business needs. 🏆 𝑪𝒐𝒓𝒆 𝑬𝒙𝒑𝒆𝒓𝒕𝒊𝒔𝒆 •𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 Development: I build complete web applications with React, Next.js, Node.js, FastAPI, Django, Flask and Express for smooth, modern user experiences. •𝐅𝐫𝐨𝐧𝐭-𝐄𝐧𝐝: I create fast, responsive interfaces using React and Next.js with clean HTML, CSS, and JavaScript. •𝐁𝐚𝐜𝐤-𝐄𝐧𝐝 & 𝐀𝐏𝐈𝐬: I develop secure server-side logic and build RESTful APIs and GraphQL services with Node.js (Express, NestJS) and Python(Django, Flask, FastAPI), GO, PHP(Laravel). •𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: MongoDB, PostgreSQL, MySQL, Firebase, Supabase •𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬: AWS (Lambda, S3, EC2, RDS, IAM), Google Cloud, Azure, Docker, Kubernetes •𝐓𝐞𝐬𝐭𝐢𝐧𝐠 & 𝐐𝐮𝐚𝐥𝐢𝐭𝐲: I write reliable, maintainable code and use Jest to ensure everything works perfectly 🤖 𝑺𝒑𝒆𝒄𝒊𝒂𝒍𝒊𝒛𝒆𝒅 𝑺𝒌𝒊𝒍𝒍𝒔 𝒊𝒏 𝑨𝑰 𝑨𝒈𝒆𝒏𝒕𝒔, 𝑨𝑰 𝑽𝒐𝒊𝒄𝒆 𝑨𝒈𝒆𝒏𝒕𝒔 & 𝑨𝒖𝒕𝒐𝒎𝒂𝒕𝒊𝒐𝒏 •AI Agentic Chatbots: Prompting, Knowledgebase, Custom Tool Integration •Multi-Agent Systems: LangChain, LangGraph, CrewAI •AI Voice Agents: Sales, Support, Reception (SynthFlow, Retell.AI, VAPI, Twilio, ElevenLabs, Botpress, Relevance.AI) •CustomGPTs & LLMs: OpenAI, Chatbase, LLaMA 3, Gemini, RAG Chatbots, DALL·E, Multimodal AI •Automation & App Integration: Zapier, Make.com, n8n, Airtable CRM, Google Calendar, Zoom, Notion 𝙒𝙝𝙮 𝙒𝙤𝙧𝙠 𝙬𝙞𝙩𝙝 𝙈𝙚? - 5+ Years of Expertise – Proven success in full-stack development. - 40+ Successful Projects – Delivered high-quality solutions on time – Building cross-platform mobile apps and high-performance web apps. - Full-Stack Proficiency – Frontend and Backend modern framewors. - Performance Optimization – Speed, scalability, and SEO-driven web apps. - Agile & Collaborative – Clear communication, structured workflows, and iterative development. 𝐋𝐞𝐭'𝐬 𝐂𝐨𝐧𝐧𝐞𝐜𝐭: I offer a free, in-depth consultation to understand your needs and provide the best solutions. Feel free to reach out—let’s get started today! Regards, Haruki 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬: Senior Front-End React.js Developer | React.js Developer | Senior React.js Developer | React | Skilled Next.js | Node.js Developer | React Native | API | React Native Developer | API Development | REST API | Express | React Native Full-Stack Developer | React Web Application | Node Expert | Expert React Native Developer | Sr. React Developer | React Frontend Developer | Tailwind CSS | React Developer | OAuth 2.0 | PWA (Progressive Web App) | API Gateway | Static Site Generation | Apollo Server | ISR (Incremental Static Regeneration) | Express.js | React Native Mobile App Developer | React Native Development | JSON Web Tokens (JWT) | Apollo Client | React.js | Styled Components | Swagger | Postman | Node.js | Zustand | RESTful APIs | TanStack Table | Material-UI | Mobile-First Design | Clerk | React Query | Code Splitting | Redux | Next.js | API Integration | Responsive Design | GraphQL Subscriptions | GraphQL | SWR | Insomnia | tRPC | Auth0 | Server-Side Rendering | Full Stack Developer | Front End Developer | Mobile App Developer | Experienced Full Stack Developer | Expert Full Stack iOS Developer | MERN Stack Developer | MEAN Stack Developer | Backend Developer | Website Developer | Back End Developer | App Developer | Full Stack App Developer | Full Stack Mobile App Developer | Android App Developer | iOS App Developer | Experienced App Developer | Professional Full Stack Developer | Senior Full Stack Developer | Upwork Full Stack Developer | Best Full Stack Developer on Upwork | Top Rated Upwork Developer | Full Stack Freelance Developer | Full Stack Software Developer | Web App Developer | Full Stack Software Engineer | Upwork App Developer | Front End Development | Back End Development | Full Stack Web Developer | Top Rated Upwork Full Stack Developer | Full Stack Next.js Developer | Git | Full Stack MERN Developer | Back-End Developer | SQL | Software Engineer | Bootstrap | Full Stack M.E.R.N Developer | Senior Software Engineer | AWS Lambda | SQLite | iOS Development | Software Development Engineer | React Bootstrap | CSS / CSS3 | HTML / HTML5 | PostgreSQL | JavaScript / JS | Amazon Web Services | Front End Developer | Agile Software Development | Software Development | Development | AI Workflow Automation | n8n | AI agent | make.com | Zapier