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Game Client Engineer / Unity Engineer
Fumihiro To
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Giving shipped games speed and structure.
About Me
Profile
I'm Fumihiro To, a Unity game client engineer with experience across smartphone game development, from early-stage title setup to solo live-ops maintenance and large-scale performance optimization.
My strength is profiler-driven bottleneck analysis. In past projects, I reduced load time by as much as 70 percent, and I am equally interested in architecture that keeps products maintainable as they grow. I actively build foundations with modern Unity-oriented tools such as VContainer, UniTask, and R3.
In the long run, I want to lead technical problem solving and architecture work that improves team productivity while delivering better player experiences.
Technical Skills
Engines & FW
- Unity 6 / 2022.3
- UniTask / UniRx / R3
- Addressables
- VContainer
Specialties
- Out-game Architecture
- Performance Tuning
- Asynchronous Loading
Tools & Others
- Git / GitHub
- VS Code / Rider
- AI Assistants
Featured Projects
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Solo Developer
Vox Dungeon
A roguelike deckbuilder developed as a personal project. Built with VContainer, R3, and UniTask, with a strict FSM-driven turn-based battle architecture.
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Solo Developer
TFramework
A personal game foundation framework designed to balance maintainability and performance. Built around VContainer and R3 to validate a loosely coupled architecture.
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Client Engineer
キングダム 頂天
Live-ops and feature development for a smartphone simulation game. Delivered major performance work including a 50 percent startup-time reduction and freeze mitigation through Addressables restructuring.
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Main Client Engineer
アイ☆スタ ぽっぷんピース！
A livestream-linked puzzle game. Covered out-game UI implementation during the new-development phase, then completed all client-side maintenance and feature work as the only engineer in live operation.
View DetailsExperience
2025.08 — 2026.01
Rudel Inc. |
Client Engineer
Live-ops and feature development for the smartphone simulation game "Kingdom Itadaki."
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- Contributed to stable live operation of "Kingdom Itadaki" through feature updates and bug fixing as a client engineer.
- Designed and built production support tools for technical artists, improving the workflow from asset preparation to in-game implementation.
- Proposed coding rules and a better pull-request review flow, helping standardize code quality and improve team productivity.
- Integrated tools such as Cursor and Gemini into the development workflow to accelerate implementation and debugging.
Key Achievements
- Resolved recurring freeze issues by redesigning Addressables operation and distributing asynchronous loading workload.
- Reduced application startup time by 50 percent through profiler-based bottleneck analysis and optimization.
2024.04 — 2025.04
ScopeNext Inc. |
Client Engineer
Client-side development and live-ops support across a livestream-linked puzzle game and a hybrid-casual RPG.
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- Worked as a client engineer across both a hybrid-casual RPG and a livestream-linked puzzle game.
- Handled API integration and out-game architecture design in the new-development phase using UniTask and UniRx.
- Acted as the main engineer during live operation, maintaining and extending both in-game and out-game features in a one-engineer setup while also supporting release flow and QA.
- Implemented new UI, large-scale UI refactors, and anti-cheat features that improved UX and helped maintain game balance.
Key Achievements
- Achieved a 70 percent load-time reduction through Unity Profiler-based bottleneck analysis.
- Sustained stable operation across two consecutive titles under limited resources.
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