Philipp Kewisch
Director, Thunderbird Web Services at Mozilla
Hamburg, Germany
Summary
🤩
Rockstar🎓
Top SchoolPhilipp Kewisch is a seasoned software leader with 18 years of experience, currently directing Thunderbird Web Services at Mozilla from Hamburg and chairing the Thunderbird Council. He blends hands-on engineering in JavaScript and Python with product and community leadership, having led mobile and add-ons teams and managed community engineering at Canonical. His open-source footprint spans core projects—from an iCalendar/vCard parser (ical.js) to contributions across Mozilla’s addons-server and Thunderbird Android—demonstrating expertise in backend systems, security-minded product operations, and accessible mobile UX. He has a track record of shipping pragmatic solutions like OAuth integrations, REST endpoints, release automation, and internationalized UIs. Comfortable navigating both technical and organizational complexity, he pairs deep protocol-level knowledge with a collaborative approach to governance and community-driven development. A former physicist and part-time technical computer science master’s student, he brings analytical rigor and long-term perspective to building durable, user-centered services.
18 years of coding experience
13 years of employment as a software developer
Abitur English Physics, Abitur English Physics at Gymnasium HochradVordiplom Physics, Vordiplom Physics at University of HamburgMaster's Degree Technical Computer Science (Part Time), Master's Degree Technical Computer Science (Part Time) at Fachhochschule Wedel
English, German
Stackoverflow
992reputation
76kreached
35answers
0questions
Github Skills (50)
kotlin10
javascript10
video-conferencing10
python10
back-end-development10
django10
user-authentication10
authentication10
ui-design10
uid10
parsing10
front-end-development10
vcd10
android10
hcard10
Programming languages (24)
Github contributions (5)
kewisch/ical.js
Jul 2012 - Oct 2022
Javascript parser for ics (rfc5545) and vcard (rfc6350) data
Role in this project:
Back-end Developer
Back-end DeveloperContributions:23 releases, 79 reviews, 406 commits in 10 years 4 months
Contributions summary:Philipp appears to be focused on the development of a Javascript parser for iCalendar and vCard data. Their contributions include implementing the initial parser functionality, including lexing and parsing content lines, parameter types, and value types. The commits also indicate work on data structure, with suggestions to structure the data in components and serialization and serialization aspects, indicating their involvement in core data handling within this project.
vcardicalendarjavascripticsrrule
linagora/openpaas-esn
Aug 2014 - Dec 2015
Open PaaS Enterprise Social Network
Role in this project:Back-end Developer
Back-end DeveloperContributions:172 commits, 2 comments in 1 year 4 months
Contributions summary:Philipp primarily contributed to back-end functionality by implementing OAuth token authentication and allowing all CORS methods for the API. They added support for logging in and continuing to a predefined URL, modifying the login controllers and authorization middleware. Further contributions include creating a REST endpoint for file uploads and modifying the events creation, update and listing.
social-networkmailpaascalendaropenpaas
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