Nicolas Thumann
Software Engineer at Greenbone
Lübeck, Schleswig-Holstein, Germany
Summary
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RockstarNicolas Thumann is a software engineer based in Lübeck, Germany, with seven years of experience building reliable backend and test infrastructure. He currently develops at Greenbone and concurrently works as a freelance security researcher, having reported and helped remediate vulnerabilities for organizations such as Deutsche Telekom and the German BSI. An active open-source contributor, he has contributed to high-profile crypto projects like Bitcoin Core and Peercoin, focusing on CI, QA, ZMQ integration, IPv6 support, and build/test improvements. Nicolas blends practical security insight with deep testing and DevOps expertise, making systems more robust and backwards-compatible—skills he leverages across both commercial and community projects.
7 years of coding experience
Github Skills (16)
bitcoin10
c-language10
zeromq10
bitcoins10
cprogramming-language10
python10
test-automation10
testing10
cicd9
blockchain9
decentralization8
litecoin8
cryptocurrency8
cryptography8
ipv68
Programming languages (19)
Github contributions (5)
bitcoin/bitcoin
Mar 2020 - Aug 2021
Bitcoin Core integration/staging tree
Role in this project:
Backend & DevOps Engineer
Backend & DevOps EngineerContributions:23 reviews, 14 commits, 8 PRs in 1 year 5 months
Contributions summary:Nicolas primarily contributes to the Bitcoin Core project by addressing software quality assurance and continuous integration. Their commits include changes to test scripts to incorporate previous releases for backwards compatibility checks and modifications to test configurations. Further contributions involve improving the system's logging, implementing ZMQ support for multiple interfaces, and adding IPv6 support. They demonstrate expertise in enhancing the project's build system and test infrastructure.
cryptographyp2pc-plus-pluscryptocurrencybitcoin-core
peercoin/peercoin
Mar 2020 - Aug 2021
Reference implementation of the Peercoin protocol.
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:14 commits in 1 year 5 months
Contributions summary:Nicolas primarily focused on improving the testing infrastructure of the project. This included updating compatibility tests to support new versions and features, adding and modifying tests related to ZMQ (ZeroMQ) integration. These changes focused on ensuring the project's stability and proper functionality across different versions and functionalities.
proof-of-stakeblockchaindecentralizedminablecryptocurrency
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