Full-Stack · Game · QA Engineer
Takeshi Juan
Engineering products with precision. From AAA game studios to AI-powered platforms. Currently building the future of generative AI and predictive intelligence in Tokyo.
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.
Skills
Technologies
Languages
0Game Engines
0Frontend & Frameworks
0Backend & Frameworks
0Cloud & Infrastructure
0Databases
0Payments & APIs
0Testing
0AI & Productivity
0Experience
Hengen Studio
Tokyo, JapanFounder & Full-Stack Engineer
Modern image transformation service using Generative AI APIs. Visual intelligence and production-grade AI integration.
SUIJIN AI
Tokyo, JapanFounder & Full-Stack Engineer
AI-powered boat-race prediction and analysis platform. Next.js 16, Supabase, Vercel AI SDK, PayPay integration.
Kyuzan Inc.
Tokyo, JapanClient Engineering Lead
Leading 6-member Unity team for new NFT mobile game. Technical architecture, CI/CD, team management.
Square Enix
Tokyo, JapanQA Engineer
Internal QA automation for FF7 Rebirth, Dragon Quest. UE4/5 integration, Python backend.
Marvelous Inc.
Tokyo, JapanGame Engineer
WACCA arcade rhythm game. UE4/C++ development, UI systems, server communication.
Ielove Group
Tokyo, JapanWeb Engineer
Real estate web platform. Full-stack PHP development, internal library design.
Part-time during graduate studies
Tokyo Institute of Technology
Tokyo, JapanMaster's Student
Information Science and Engineering. Advanced research in computer science.
X-LEGEND Entertainment
TaiwanGame Engineer
Aura Kingdom mobile MMORPG. CRYENGINE/C++ development, gameplay systems.