Stefan Koelbl
Director at ABC
Germany
Summary
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RockstarStefan Koelbl is a Director based in Germany with 12 years of experience building secure, production-grade backend systems. He combines leadership with hands-on security engineering, notably contributing to the widely used open-source Tink crypto library by integrating Google Cloud KMS and AWS KMS support and implementing AEAD envelope encryption examples. At ABC he oversees technical direction while remaining active in code-level improvements that enhance key handling and error reporting. His work reflects a pragmatic focus on making cryptography easier and safer to use in real-world cloud environments. Colleagues know him for translating complex security requirements into auditable, developer-friendly solutions. He brings a rare blend of managerial responsibility and deep, practical expertise in cloud KMS integrations.
12 years of coding experience
Github Skills (5)
aws10
python10
cryptography10
security10
testing9
Programming languages (7)
Github contributions (5)
tink-crypto/tink
Dec 2019 - Jan 2023
Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.
Role in this project:
Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:236 commits, 2 pushes, 43 comments in 3 years 1 month
Contributions summary:Stefan made significant contributions to enhance the security and functionality of the Tink crypto library, specifically focusing on Google Cloud KMS and AWS KMS integrations. Their work involved implementing support for AEAD encryption using these KMS clients. Further improvements included building a Python CLI example for envelope encryption and code modifications for better key handling and improved error reporting.
securecryptographycppcross-languagemulti-language
kste/haraka
Feb 2016 - Sep 2017
Contributions:21 commits, 14 pushes, 2 branches in 1 year 8 months
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