Hansel Notes · est. 2026

Hi, I’m Hansel Susanto.
I write software, and notes about it.

I’m a software engineer based in Tokyo. By day I work on the LINE messaging app at LY Corporation (LINE Yahoo). On the side I run MTS Studio (a product studio shipping apps in EdTech, community, and IoT) and am building Incid (the studio’s next product — an on-call command center for engineers who get paged at 3 AM). This is where I keep my reading, my notes, and the things I’m trying to figure out.

Recent writing

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Elsewhere

Building

Incidincid.app
An on-call command center for engineers paged at 3 AM. Launching soon.
MTS Studiomtsstudio.dev
A remote-first product studio I started in 2018. Six years, 10+ products, 30,000+ users.

Research

Publicationshansels.dev/publications
Two peer-reviewed papers in Springer — on automated essay scoring with DeBERTa, and on the Mikado Method for refactoring legacy code.
Google Scholarscholar.google.com
Citations, co-authors, and the canonical academic profile.

Find me

GitHubgithub.com/hansels
Open source code, dotfiles, and the occasional contribution.
LinkedInlinkedin.com/in/hansels
Career history, professional updates, and the formal version of my story.

Reach me

Email[email protected]
My inbox is open. I read everything and reply to most things.
RSS/rss.xml
Writing, reading reflections, and violin entries — one feed, in your reader.

Hi, I’m Hansel Susanto.I write software, and notes about it.

Recent writing

Elsewhere

Hi, I’m Hansel Susanto.
I write software, and notes about it.