kalvin.ioFullstack engineer in Tokyo
I'm Calvin (Kal). I build AI agents, speech systems, and fast web apps, from the model layer to the user interface.
Tokyo ·
Experience
- 2025 — nowTokyo
Fullstack Engineer · AI voice company
- Building AI agent and voice products end to end, from the model layer to the user interface.
Tokyo - 2024 — 2025Tokyo
Speech Team Lead · ad-tech company
- Led the team building low-latency conversational agents for enterprise partners.
- Took speech-to-text pipelines and transcription systems from prototype to production scale.
Tokyo - 2023 — 2026—
M.S. Computer Science (Machine Learning) · Georgia Tech
— - 2023 — 2024Tokyo
Software Engineer · social hiring platform
- Built high-performance enterprise SaaS interfaces with Next.js and Rails.
- Architected a loyalty point system and ran data migrations with zero downtime.
Tokyo - 2022Tokyo
Software Engineer · telecom company
- Led a small team to deliver an internal career platform that won a company-wide award.
- Tuned query performance across a distributed database.
Tokyo - 2021 — 2022Hong Kong
Software Engineer · fintech startup
- Built Go and Python microservices that parsed and analyzed bank statements.
- Rebuilt the testing infrastructure, cutting run time and memory usage.
Hong Kong - 2017 — 2021Hong Kong
B.Eng. Computer Science · The University of Hong Kong
Hong Kong
Projects
- GBFinder OmegaRealtime raid finder for Granblue Fantasy, written in Go. Delivers high volumes of raid signals in under a second.
- henkakuSmall JS library that converts strings between full-width and half-width characters.
- guru-puDiscord bot that assigns server roles automatically.
- akainaComputer vision model that counts Magikarp in a YouTube live stream.
Skills
- Technical
- TypeScript · JavaScript · Python · Go · Ruby · React · Next.js · PyTorch · LLM/GenAI
- Languages
- Cantonese · Mandarin · English · Japanese