Maximilien Mellen
Software Engineer at Mercari, Inc.
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolMaximilien Mellen is a full-stack software engineer with 10 years’ experience building pragmatic, user-focused solutions across web, mobile, and blockchain platforms. Based in Tokyo, he has shipped production features at companies from DeepL and Klarna to Mercari, and contributed to the Arweave ecosystem by modernizing arweave-js typings, imports, and build tooling. He blends frontend polish (React, TypeScript, React Native) with backend concurrency work (Elixir/OTP, Erlang packaging) and a habit of improving developer ergonomics through stronger typings and automated builds. Known for approaching problems holistically, he also drives team learning and robust delivery—often tackling infrastructure and build-process improvements that aren’t obvious from product-facing features.
10 years of coding experience
8 years of employment as a software developer
DUT, Information Technology, DUT, Information Technology at Université Savoie Mont Blanc
English, French, German, Spanish, Chinese, Japanese
Stackoverflow
3reputation
221reached
0answers
1question
Github Skills (10)
typescript10
javascript10
typescripts10
typescript-types10
build-process9
web-development9
nodejs8
mingw6
makefile6
sdl6
Programming languages (13)
Github contributions (5)
ArweaveTeam/arweave-js
Feb 2019 - Feb 2019
Browser and Nodejs client for general interaction with the arweave protocol and gateways
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:10 commits, 21 PRs, 35 pushes in 1 day
Contributions summary:Maximilien primarily focused on improving the TypeScript typings within the Arweave-js library. They also replaced `require` statements with `import` statements, modernizing the codebase. Furthermore, the user built and formatted the distribution files for the project, demonstrating an understanding of the build process and code organization. They also worked on reorganizing the build process and aligning node and web indexes.
arweavenodejs-client
maxmellen/elixir-language-support
Jul 2018 - Jan 2019
Elixir language support for VS Code
Contributions:32 commits, 3 PRs, 29 pushes in 5 months
elixirvscode
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