Sebastian Annies
Professional Freelancer at Sebastian Annies
Hamburg, Germany
Summary
🤩
Rockstar🎓
Top SchoolSebastian Annies is a seasoned software engineer and freelance consultant based in Hamburg with 14 years of experience building cloud-native, media and backend systems. He has led engineering for DRM and media workflow products at castLabs, architected TB-scale encoding/transcoding pipelines, and contributed deep expertise in Java-based media parsing (notably improvements to an MP4 parser handling H.264/HEVC and AAC/DTS). Comfortable across serverless AWS stacks and Angular front-ends, he blends hands-on implementation with technical leadership—having driven platform migrations to Git/Maven and run distributed game-server and DRM projects. As a freelancer since 2015 he focuses on making complex systems reliable and efficient, often optimizing memory and codec handling in low-level media components.
15 years of coding experience
17 years of employment as a software developer
Diplom, Computer Science (Informatik), Diplom, Computer Science (Informatik) at Universität Hamburg
German, English
Stackoverflow
2,488reputation
529kreached
53answers
2questions
mp4
top-1%
Github Skills (15)
mp4parser10
mp410
parse10
aac10
h26410
hevc9
dts8
mpeg6
live-streaming6
amazon-web-services6
android6
streaming6
android-layout6
trim6
java6
Programming languages (14)
Github contributions (5)
sannies/mp4parser
Sep 2013 - Apr 2022
A Java API to read, write and create MP4 files
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 releases, 1 review, 753 commits in 8 years 8 months
Contributions summary:Sebastian's commits primarily involve modifications to the MP4 parser library. They focused on improvements to the parsing and handling of video (H.264, HEVC) and audio (AAC, DTS) stream information. The user implemented a variety of changes, including supporting new features and codecs, and improving memory efficiency.
java-apimp4
castlabs/pycaption
Jun 2018 - May 2022
Python module to read/write popular video caption formats
Contributions:4 reviews, 20 commits, 12 PRs in 3 years 11 months
python-modules
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