Cassondra Foesch
Staff Engineer at SIXT
Nuremberg, Bavaria, Germany
Summary
🤩
Rockstar🎓
Top SchoolCassondra Foesch is a Staff Engineer based in Nuremberg with 11 years of professional experience and over 20 years of hands-on programming history, specializing in emulation/virtualization, compilers, and high-performance Go services. She has guided payment and backend platforms at HelloFresh and Feeld, mentors engineers across levels, and now shapes infrastructure and delivery at SIXT. Her open-source pedigree includes significant contributions to PearPC and bug- and performance-focused fixes to the widely used Go SFTP package, demonstrating deep systems-level debugging and protocol fidelity. Past roles at Google, Microsoft, and Amazon sharpened her reliability and build-system expertise, while positions at Zattoo and AudienceScience highlight a knack for tooling that squeezes efficiency from media and data pipelines. Colleagues rely on her for emergency problem-solving and for translating complex production issues into robust, maintainable solutions. She combines low-level systems instincts with pragmatic leadership, often stepping into people and architectural gaps to keep projects moving.
11 years of coding experience
12 years of employment as a software developer
Zentrale Mittelstufenprüfung, German, ausreichend, Zentrale Mittelstufenprüfung, German, ausreichend at Goethe-Institut in Munich2003, Computer Science, 2003, Computer Science at New Mexico State University
German, English, Japanese, American Sign Language, Esperanto, Spanish, Portuguese, Swedish, Greek
Github Skills (7)
filesystem10
go10
file-operations10
sftp10
fileio10
concurrency10
testing9
Programming languages (9)
Github contributions (5)
pkg/sftp
Feb 2020 - Nov 2022
SFTP support for the go.crypto/ssh package
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 releases, 336 reviews, 278 commits in 2 years 9 months
Contributions summary:Cassondra contributed to the `pkg/sftp` repository by fixing bugs related to the `RequestServer` functionality, including addressing issues in the `serveLoop` and file handling. They refactored the `memFile` implementation and improved the performance of the `WriteTo` function, particularly addressing potential concurrency problems. The user's work also involved improvements in the handling of symlinks and exclusive file creation to match the OpenSSH SFTP protocol.
sftpsshgo
puellanivis/hlscat
Mar 2018 - Mar 2021
dump HLS source to stdout or redirected output
Contributions:4 releases, 17 pushes, 1 branch in 3 years
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