Sebastian Ramacher - Senior Scientist at Debian

Sebastian Ramacher

Senior Scientist at Debian

Vienna, Austria

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Summary

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Rockstar

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Top School

Sebastian Ramacher is a senior scientist and cryptography researcher based in Vienna with 15 years of experience spanning academia, applied research, and long-running open-source stewardship. At AIT he focuses on post-quantum signature schemes, secure communication protocols and privacy-preserving protocols, bringing PhD-level rigor to real-world deployments. He is also a long-time Debian developer and Release Team member, combining research with hands-on systems and packaging expertise. Sebastian contributes low-level crypto and media-processing code across notable projects (liboqs, pycrypto, VLC, Jellyfin), often fixing platform-specific SIMD and CPU-extension issues that reveal deep systems knowledge. As an external lecturer he bridges teaching and research, and his blend of math and CS training underpins careful, performance-minded cryptographic engineering.

15 years of coding experience

5 years of employment as a software developer

Doctor of Philosophy (PhD), Computer Science, Doctor of Philosophy (PhD), Computer Science at Technische Universität Graz

Master of Science (MSc), Mathematics, Master of Science (MSc), Mathematics at Karl-Franzens-Universität Graz

Github Skills (45)

algorithm10

debugging10

algorithms10

debug10

maintenance10

qt10

python10

testing10

c1110

ffmpeg10

refactor10

security10

post-quantum-cryptography10

c1710

cryptography10

Programming languages (15)

JavaC++CSSRustCStandard MLCMakeTeX

Github contributions (5)

pwmt/zathura

Sep 2010 - Jan 2023

Document viewer

Role in this project:

Back-end Developer

Contributions:23 reviews, 1073 commits, 76 PRs in 12 years 5 months

Contributions summary:Sebastian primarily worked on adding and improving tests for the codebase, focusing on string manipulation and file validation functions. They added and refactored test cases within the `tests/test_utils.c` file, demonstrating a strong understanding of testing principles and the codebase's utility functions. Additionally, the user integrated support for detecting mimetypes using magic, enhancing the document viewer's functionality, and fixed a memory leak.

document-viewerviewerdmsgtk3

bpython/bpython

Jun 2011 - Jan 2023

bpython - A fancy curses interface to the Python interactive interpreter

Role in this project:

Backend Developer & Maintainer

Contributions:14 releases, 34 reviews, 1284 commits in 11 years 8 months

Contributions summary:Sebastian primarily focused on maintaining and improving the bpython REPL's functionality. The contributions involved refactoring and enhancing code related to handling import completion, syntax errors, and configuration. These changes included addressing encoding issues and implementing functionalities like copy to clipboard, as well as ensuring compatibility and maintainability of the core codebase. The user’s work improved the stability and features of the bpython REPL.

pythonpython-interactivebpythoninterpreterfancy

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