Kal's pixel-art avatar
Tokyo, Japan · AI Agents · Voice · Web

Hello There.

I'm Calvin (Kal), a fullstack engineer in Tokyo. I build AI agents, speech systems, and fast web apps.

Experience

2025 — Present · Tokyo

Fullstack Engineer at an AI voice company

  • Building AI agent and voice products end to end, from the model layer to the user interface.
2024 — 2025 · Tokyo

Speech Team Lead at an 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.
2023 — 2024 · Tokyo

Software Engineer at a 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.
2022 · Tokyo

Software Engineer at a 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.
2021 — 2022 · Hong Kong

Software Engineer at a fintech startup

  • Built Go and Python microservices that parsed and analyzed bank statements.
  • Rebuilt the testing infrastructure, cutting run time and memory usage.

Education

M.S. in Computer Science (Machine Learning)

Georgia Institute of Technology · 2023 — 2026

B.Eng. in Computer Science

The University of Hong Kong · 2017 — 2021

Projects

Project 01

GBFinder Omega

Realtime raid finder for Granblue Fantasy, written in Go. Delivers high volumes of raid signals in under a second.

View on GitHub
Project 02

henkaku

Small JS library that converts strings between full-width and half-width characters.

View on GitHub
Project 04

akaina

Computer vision model that counts Magikarp in a YouTube live stream.

View on GitHub

Skills

Languages

CantoneseMandarinEnglishJapanese

Technical

TypeScriptJavaScriptPythonGoRubyReactNext.jsPyTorchLLM/GenAI