Markย Hahn
Advisory at Mantra Inc.
Tokyo, Japan
Summary
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Rockstar๐
Top SchoolMark Hahn is a multilingual engineering leader based in Tokyo with 9 years of hands-on experience building and scaling large-scale distributed systems and product organisations. He progressed from backend software engineer at Mercari to Head of Engineering overseeing 40+ multinational engineers, and has guided teams through 0โ1 MVPs, post-PMF scale-outs, and IPO readiness. Deep technical expertise in CI/CD, SRE, multi-cloud resiliency and on-call/runbook culture complements his strategic work in performance management, leadership development, and cross-functional product alignment. Recent roles include CTO and technical advisor, reflecting a shift toward advisory and research while retaining strong delivery instincts. Known for fostering learning cultures (lunch-and-learns, mentoring, engineering ladders) and pragmatic system design, he blends operational rigor with people-first leadership. Fluent in English, Japanese, and Korean, he uniquely bridges executive strategy and day-to-day engineering across diverse teams.
10 years of coding experience
6 years of employment as a software developer
Master of Engineering - MEng, Master of Engineering - MEng at Tokyo Institute of Technology
Github Skills (13)
golang10
antora10
go10
asciidoc10
circleci10
documentation9
cprogramming-language5
protobuf2
typescript2
hashicorp1
google-cloud1
terraform1
gcp1
Programming languages (11)
Github contributions (5)
TangoEnSkai/committer-go
Nov 2019 - Jun 2026
Contributions:29 pushes, 14 branches, 2 tags in 6 years 8 months
TangoEnSkai/golang-workspace
Aug 2018 - May 2019
Contributions:2 PRs, 331 pushes, 5 branches in 9 months
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