Stefan Humm
Staff Mobile Engineer at Mercari, Inc.
Chiyoda, Japan
Summary
👤
Senior🎓
Top SchoolStefan Humm is a Staff Mobile Engineer with a decade of hands-on Android experience, currently shaping Mercari’s mobile platform from Tokyo. He progressed from Android Mobile Engineer to Tech Lead and now staff level at a high-scale C2C marketplace used by millions, blending technical leadership with deep platform knowledge. Known for optimizing performance, BLE reliability and battery consumption, he has led SDK and app development while also delivering B2B React/Redux solutions. A German engineer who relocated to Japan, he brings cross-cultural collaboration and a pragmatic focus on shipping user-facing features that reach thousands. His background includes end-to-end projects—from Node.js backends in academic work to production mobile systems—illustrating both breadth and a bias for measurable product impact.
10 years of coding experience
10 years of employment as a software developer
Bachelor of Science - BS, Media informatics, Bachelor of Science - BS, Media informatics at Media UniversityApprenticeship (equivalent to A level), Apprenticeship (equivalent to A level) at Robert-Bosch-Schule UlmApprenticeship as a Computer Sience Expert, Apprenticeship as a Computer Sience Expert at Robert Bosch GmbH
German, English, Japanese
Github Skills (200)
realtime10
mobile-development10
postgresql10
emoji10
windows10
firebase10
auth10
flutter-plugin10
app-framework10
skiasharp10
locale10
skia10
dart10
database10
cross-platform10
Programming languages (12)
Github contributions (5)
Fintasys/emoji_picker_flutter
Mar 2021 - Jan 2023
A Flutter package that provides an Emoji picker widget with 1500+ emojis in 8 categories.
Contributions:38 releases, 84 reviews, 131 commits in 1 year 10 months
emojiflutter-packagewidgetdartflutter-plugin
Fintasys/Portfolio-Website
Oct 2018 - Jun 2021
Contributions:2 pushes, 1 branch in 2 years 9 months
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