Finnbarr O'callahan
Senior Full-Stack Software Engineer at Freegle
Old Toronto, Ontario, Canada
Summary
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Senior🎓
Top SchoolFinnbarr O'callahan is a Senior Full-Stack Software Engineer with eight years of experience building cross-platform products and leading engineering teams, currently working on consumer-facing projects in Toronto. A former game studio co-founder and CTO, he shipped a multiplayer title with 70k+ users and implemented GPU-accelerated rendering and cross-platform voice features, blending low-level optimization with product-focused design. At Sago Mini he accelerated QA and CI pipelines, automated documentation, and led SDK support for payments and accounts, showing a strong reliability and developer-experience mindset. Finnbarr combines Unity and web/mobile expertise with systems thinking—comfortable prototyping gameplay mechanics as well as architecting backend analytics and error-tracking. He’s passionate about applying technology to education, sustainability, and digital rights, and brings a pragmatic, data-informed approach to prioritizing work and improving retention.
8 years of coding experience
6 years of employment as a software developer
Bachelor of Science, Computer Science, Bachelor of Science, Computer Science at University of Toronto
Github Skills (26)
tabletop9
user-interface7
game-development6
php-api5
mobile-application5
redis5
game-engine5
jam5
redis-client4
javscript4
adapter3
server-side3
batch-processing3
dotnet3
regression-analysis2
Programming languages (6)
Github contributions (5)
fnnbrr/personal-site
Jul 2024 - Apr 2026
Contributions:1 PR, 31 pushes, 2 branches in 1 year 10 months
FedericoAureliano/aiutare
May 2019 - Sep 2019
Automated Analysis, Regression, and Evaluation
Contributions:9 PRs, 114 pushes, 19 branches in 3 months
regressionpythonevaluationregression-analysisautomated-analysis
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