Tasos Katsoulas
Sr Staff Software Engineer at Mozilla
Athens, Attica, Greece
Summary
🤩
Rockstar🎓
Top SchoolTasos Katsoulas is a Sr. Staff Software Engineer based in Athens with 13 years of experience designing and shipping web-scale features at Mozilla. He progressed through engineering and tech-lead roles on Mozilla’s Support and MDN platforms, leading full-stack development, UX experiments, and performance-driven backend changes. His open-source contributions include meaningful work on well-known Mozilla projects—kitsune, mozillians and mozilla-django-oidc—where he implemented pagination, OpenID Connect enhancements, A/B testing hooks, and analytics integrations. Tasos blends backend authentication and token validation expertise with front-end UX refinements, showing a pragmatic cross-discipline approach to product quality. He’s comfortable refactoring for maintainability and has hands-on experience managing schema and API changes that improve scalability and observability. Trained in Electronics and Computer Engineering, he combines systems thinking with a designer’s attention to user experience.
13 years of coding experience
11 years of employment as a software developer
Electronics and Computer Engineering, Electronics and Computer Engineering at Technical University of Crete
Github Skills (39)
javascript10
pytest10
back-end-development10
apidoc10
python10
google-analytics10
django10
openid-connect10
css10
oid10
user-authentication10
authentication10
multiview10
html-template10
python-templates10
Programming languages (15)
Github contributions (5)
mozilla/mozilla-django-oidc
Oct 2016 - Dec 2022
A django OpenID Connect library
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 releases, 45 reviews, 133 commits in 6 years 2 months
Contributions summary:Tasos contributed significantly to the backend functionality of the Django OpenID Connect library. Their work included creating a helper method for importing settings, implementing basic authentication features, and adding unit tests. The user also refactored code related to settings and URLs and improved token validation.
djangoopenid-connect
mozilla/kitsune
Feb 2019 - Jan 2023
Platform for Mozilla Support
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:7 releases, 1282 reviews, 1394 commits in 3 years 11 months
Contributions summary:Tasos was primarily involved in implementing and integrating user experience (UX) experiments within the Mozilla Support platform, kitsune. This involved adding static assets, utilizing waffle flags for A/B testing, and tracking analytics events for article feedback using Google Analytics (GA). Furthermore, the user made improvements to the CSS and JavaScript files, as well as addressing code review feedback and managing database changes for performance improvements. The changes touched upon frontend and backend development tasks, including database schema modifications and CSS/Javascript changes.
mozilla
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