Masato Ohba
Software Engineer at SmartBank
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolMasato Ohba is a Tokyo-based software engineer with 11 years in the field and over 8 years focused on web development using Ruby on Rails, React, and TypeScript. He currently builds core fintech services at SmartBank, delivering production-grade features like 3-D Secure, idempotent APIs, automated deployment and robust data migration flows for a challenger bank. Previously he led engineering and recruitment efforts at Quipper, blending hands-on coding with management practices such as structured interviews and feature toggles to improve delivery and conversion. An active open-source contributor, he has improved Ruby tooling and test suites—most notably enhancing the venice in-app purchase verification gem and contributing specs to ruby/spec. With a humanities background from Keio University, he brings a user-centered perspective and a motto-driven passion for creating experiences that “impress and touch” people.
11 years of coding experience
8 years of employment as a software developer
Bachelor's degree, European History, Bachelor's degree, European History at Keio University
Japanese, English
Stackoverflow
69reputation
3kreached
5answers
1question
Github Skills (15)
rspec10
spec10
lang10
test-suite10
mspec10
rubyspec10
test-automation10
ruby10
jsonp8
json8
jsonb8
recursion6
cdn6
javascript6
coffeescript6
Programming languages (16)
Github contributions (5)
nomad-cli/venice
May 2016 - Dec 2019
Ruby Gem for In-App Purchase Receipt Verification
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 review, 10 commits, 9 PRs in 3 years 7 months
Contributions summary:Masato focused on enhancing the `venice` gem, a Ruby library for in-app purchase receipt verification. Their contributions involved adding functionality, such as enabling shared secret options and handling `latest_receipt_info` in different formats. They also made improvements to the data processing logic related to expiration dates and pending renewal information, and included corresponding tests. This user’s work directly improved the core functionality of the receipt verification process.
ruby-gemappstorestorekitsubscriptionvisa
ruby/spec
Aug 2019 - Oct 2022
The Ruby Spec Suite aka ruby/spec
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:2 reviews, 8 commits, 5 PRs in 3 years 2 months
Contributions summary:Masato contributed to the project by adding and modifying test specifications for the Ruby language. Their commits primarily focused on testing core Ruby functionalities, including the `Hash`, `Time`, and `ERB` classes. The work involved creating test cases, modifying existing tests, and ensuring the correct behavior of these core Ruby features. The user also corrected a typo in an existing test.
ruby-gemmspecrailsrubyspec
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