Masashi Umezawa
Owner, CEO at SoftUmeYa
Chiyoda, Japan
Summary
👤
Senior🎓
Top SchoolMasashi Umezawa is a seasoned software entrepreneur and CEO with 15+ years delivering pragmatic, object-oriented solutions across embedded systems, collaboration platforms, and web/mobile apps from his base in Chiyoda, Japan. As founder of SoftUmeYa he blends agile consulting with hands-on development—building everything from a SvelteKit wiki and iOS streaming/visual programming apps to Squeak-based collaborative ontology and scheduling tools. His background spans Smalltalk/Seaside and CORBA-era distributed systems to modern UI stacks, giving him rare depth in both legacy middleware and contemporary frontend engineering. He has driven marketplace-scale projects as a technical fellow at SORABITO and repeatedly applied prototyping and OO design to solve complex domain problems like power-plant scheduling and OSPF simulation. Colleagues rely on him for pragmatic architecture, rapid prototyping, and translating formal ontology thinking into usable collaborative tools.
15 years of coding experience
Kyoto University
English, Japanese
Github Skills (125)
msgpack10
xml-serializer10
sendgrid-api10
directories10
pharo10
portable10
unqlite10
thin10
dialect10
tarantool10
json10
smalltalk10
serializer10
squeak10
serialization10
Programming languages (12)
Github contributions (5)
mumez/Stick
Jan 2019 - May 2020
An event-based socket reconnection layer for Pharo smalltalk
Contributions:6 commits, 23 PRs, 21 pushes in 1 year 4 months
pharo-smalltalkpharosocketsmalltalkreconnection
SoftUmeYa/Pyonkee
Aug 2014 - Dec 2022
Pyonkee is a visual-programming environment for iPad. It is based on Scratch from the MIT Media Lab.
Contributions:20 releases, 210 commits, 37 PRs in 8 years 5 months
ipadprogramming-environmentiosvisual-programmingscratch
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.