ArcadeRelay
Turn ideas into playable games with AI.
An experimental harness designed to connect implementation, play, evaluation, and iteration through AI agents, turning game ideas into working prototypes.
- Game AI
- Agent Harness
- JavaScript
- MIT
Game Tools · QA Automation · Build Infrastructure
Takeshi Juan
Building reliable game development environments through engine integration, QA automation, CI/CD, and production-focused tooling.
Tokyo, Japan
About
I craft software that bridges technical excellence with exceptional user experience—from AAA game engines to production-grade AI systems.
After graduating from a university in Taiwan in 2017, I began my career at X-LEGEND Entertainment developing smartphone MMORPGs. I then completed my Master's in Information Science and Engineering at Tokyo Institute of Technology.
At Marvelous, I developed the arcade rhythm game "WACCA" using Unreal Engine 4, focusing on game UI implementation and server communication systems.
My time at Square Enix involved building internal QA automation systems for major titles including FF7 Rebirth and Dragon Quest series, integrating with UE4/5 and Python backend systems.
Currently at Kyuzan, I lead a 6-member client engineering team for a new NFT mobile game, driving technical decisions from architecture design to CI/CD pipeline construction.
Clean Architecture
Domain-driven design with clear separation of concerns for maintainable, scalable codebases.
AI-Augmented Development
Leveraging Claude Code, Warp, and Windsurf to maximize team output and code quality.
Craftsmanship
Obsessive attention to detail, from pixel-perfect UI to optimized system performance.
Open Source
Turning ideas in AI and game development into reusable tools and playable experiments.
perfect-prompt
Turn terse intent into structured, verifiable prompts.
An Agent Skill that prepares prompts for coding and research agents with goals, constraints, context, and verification gates.
- Agent Skill
- Python
- MIT
create-public-pr
Publish safely without exposing private context.
An Agent Skill that audits Git history and worktrees, then controls public scope, validation, and draft pull request creation.
- Agent Skill
- Security
- Python
- MIT
Side Projects
Personal experiments outside the core game-development focus — surfaced here for transparency.
Skills
50+
Technologies
Languages
12C#C++CPythonTypeScriptJavaScriptPHPSwiftObjective-CHTML/CSSBashPowerShell
Game Engines
3UnityUnreal Engine 4/5CRYENGINE
Frontend & Frameworks
6Next.jsReactTailwind CSSReact Hook FormZodjQuery
Backend & Frameworks
5NestJSNode.jsVercel AI SDKZend FrameworkLaravel
Cloud & Infrastructure
8AWSGoogle Cloud PlatformVercelSupabaseFirebaseDockerGitHub ActionsFastlane
Databases
3PostgreSQLMySQLRedis
Payments & APIs
4StripePayPayResendBoatraceOpenAPI
Testing
3PlaywrightVitestJest
AI & Productivity
6OpenAI GPT-4Vercel AI GatewayClaude CodeWarpWindsurfFigma
Experience
2025
Hengen Studio
Side ProjectFounder & Full-Stack Engineer
Modern image transformation service using Generative AI APIs. Visual intelligence and production-grade AI integration.
2025
SUIJIN AI
Side ProjectFounder & Full-Stack Engineer
AI-powered boat-race prediction and analysis platform. Next.js 16, Supabase, Vercel AI SDK, PayPay integration.
2024 – Present
Kyuzan Inc.
Client Engineering Lead
Leading 6-engineer Unity client team. Established Clean Architecture, GitHub Actions / Fastlane CI/CD pipeline (-70% deploy time), shared dev infrastructure across the team.
2022 – 2024
Square Enix
QA Automation / Tools Engineer
Built internal QA automation framework for AAA titles (FF7 Rebirth, Dragon Quest). UE4/5 plugin integration, Python orchestration backend, editor tooling for non-engineer QA staff.
2020 – 2022
Marvelous Inc.
Game Engineer
WACCA arcade rhythm game. UE4/C++ development, UI systems, server communication.
2019 – 2022
Ielove Group
Web Engineer
Real estate web platform. Full-stack PHP development, internal library design.
Part-time during graduate studies
2018 – 2020
Tokyo Institute of Technology
Master's Student
Information Science and Engineering. Advanced research in computer science.
2017 – 2018
X-LEGEND Entertainment
Game Engineer
Aura Kingdom mobile MMORPG. CRYENGINE/C++ development, gameplay systems.