Shunta Komatsu
Payment platform. AI-native teams. Small businesses
How I got here.
Software engineering and team management, mixed.
Over the past five years, I've worked across software engineering and team management. I hold a Master's degree in Computer Science and a strong interest in AI, FinTech, and real estate.
Where I've shipped.
Merpay Payment Platform; Yomoyama real estate; RINGBELL marriage agency.
- Mar 2025 — PresentCurrentEngineering ManagerMercari, Inc.
Engineering Manager for two teams in Merpay — Payment Core (since Mar 2025) and Payment Solution (since Jan 2026) — leading 10 engineers in total. Also contributing as an individual contributor on the PCP Foundation team since Mar 2026.
- Jan 2026 — PresentSideSenior Software EngineerRINGBELL, Inc.
Main developer and architect of a marriage agency service in Japan.
- May 2025 — PresentSideChief Technology OfficerYomoyama, Inc.
Leading full-stack development of a real estate price estimation service.
- Jul 2024 — May 2025Senior Software EngineerYomoyama, Inc.
Developed a real estate price estimation service.
- Jul 2024 — Mar 2025Technical LeadMercari, Inc.
Led technical development of Payment Platform in the Payment Core team.
- Apr 2022 — Jun 2024Software EngineerMercari, Inc.
Joined as a new graduate and worked on developing Payment Platform used company-wide.
Full work history — linkedin.com/in/shuntak (opens in new tab)
Where I studied.
Tokyo University of Science · computer science and image processing research.
- Apr 2020 — Mar 2022Master of Science in Computer ScienceTokyo University of Science
Focused on artificial intelligence and machine learning. Conducted research on image processing under Professor Yukinobu Taniguchi.
- Apr 2016 — Mar 2020Bachelor of Science in Computer ScienceTokyo University of Science
Coursework in information engineering and statistics. Conducted research on image processing under Professor Yukinobu Taniguchi.
Talks I've given.
Professional & academic.
- 01 The Journey to AI-Native: Driving Company-Wide Adoption Through Data and Practice (opens in new tab) mercari Gears 2025 Nov 2025
- 02 Cursor Meetup Tokyo (opens in new tab) Cursor Meetup Tokyo · 6000+ attendees Jun 2025
- 03 The Future of encoding/json (opens in new tab) Go Conference mini 2023 Winter in Kyoto Dec 2023
- 04 Recap: Automatically Instrument Your Go Source Code with Orchestrion (opens in new tab) mercari.go #24 — GopherCon 2023 Recap Sep 2023
- 05 Recap: The Future of JSON in Go (opens in new tab) Go 1.21.1 Release Party & GopherCon 2023 Recap Sep 2023
- 01 Passenger Flow Estimation with Bipartite Matching on Bus Surveillance Cameras IEEE MIPR 2021 Apr 2021
What I've written.
On the Mercari Engineering Blog.
- 01 Payment Platform の 2025 年: メルカリグループを支える決済基盤のこれまでとこれから (opens in new tab) Mercari Engineering Blog Dec 2025
- 02 PCP LLM Week: How We Become AI-Native (opens in new tab) Mercari Engineering Blog Jun 2025
- 03 事業者請求払い: 多様な決済を支える決済基盤の仕組み (opens in new tab) Mercari Engineering Blog Dec 2024
- 04 決済基盤の Observability を向上するための Datadog Dashboard の進化 (opens in new tab) Mercari Engineering Blog Dec 2023
- 05 メルペイ決済基盤における Source Payment による決済手段の抽象化 (opens in new tab) Mercari Engineering Blog Jun 2023
Recognition.
Say hello.
Mail is best.