John O'brien
Senior Developer at Ad Signal
Fleet, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolJohn O'Brien is a Senior Developer with 11 years' professional experience and a 9+ year specialism in Ruby and Rails, focused on back-end engineering, API design, and robust SQL-based database architectures. He champions test-driven development, CI/CD and best practices, and has led modernization and mentoring efforts across fintech and cybersecurity projects. His work spans full-stack JavaScript (React, Node), AWS services including Lambda and Neptune graph databases, and practical DevOps and infrastructure-as-code experience. Known for quickly grasping complex problems and explaining solutions to technical and non-technical stakeholders, he has built internal security tooling, CRM integrations, and bespoke web apps for clients in capital markets and consulting. Outside work he channels his problem-solving appetite into puzzles and escape rooms, a habit that reflects his methodical approach to debugging and system design.
11 years of coding experience
16 years of employment as a software developer
Bachelor’s Degree English Language and Linguistics, Bachelor’s Degree English Language and Linguistics at University of YorkKing Edward VI Grammar School, Chelmsford
Stackoverflow
1,959reputation
198kreached
23answers
5questions
atom-editor
top-5%
Github Skills (24)
slack-bot9
atom-editor9
lcg7
html6
php6
sql6
slack6
jquery6
autolayout6
objective-c6
ios6
mysql6
theme-ui5
lita4
android3
Programming languages (9)
Github contributions (5)
muyjohno/statto
Jan 2015 - Feb 2015
Contributions:102 PRs, 74 pushes, 104 branches in 28 days
muyjohno/cobra
Mar 2017 - Jun 2020
Netrunner tournament software
Contributions:11 releases, 247 commits, 228 PRs in 3 years 4 months
netrunner
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