Carsten Zöller
Software-Entwickler at andrena objects ag
Cologne, North Rhine-Westphalia, Germany
Summary
🤩
Rockstar🎓
Top SchoolCarsten Zöller is a software engineer based in Cologne with 12 years of experience specializing in software architecture, quality, and back-end development. He champions Extreme Programming practices—pair programming, TDD, and continuous integration—to keep systems robust under pressure and prioritizes extensive unit, integration, and acceptance testing as his “safety net.” At andrena objects ag he applies this discipline across diverse projects and has a habit of mentoring colleagues in a Ben Kenobi–like way, fostering constructive technical debate on architectural decisions. His open-source contributions touch prominent projects like JaCoCo, bitcoinj, Immich and LND, where he focused on code clarity, correctness, and improving developer experience. Holding a PhD-equivalent in computer science and advanced degrees in mathematics, he combines rigorous academic thinking with pragmatic engineering. He’s comfortable asking tough questions that can reset a project’s direction to preserve long-term quality.
12 years of coding experience
Master of Science (M.Sc.), Mathematik, Master of Science (M.Sc.), Mathematik at Johannes Gutenberg-Universität Mainz
German, English
Stackoverflow
5,713reputation
984kreached
144answers
37questions
java
top-5%
arraylist
top-1%
Github Skills (55)
server-side10
code-optimization10
lightning-network10
typescript10
bitcoin10
bitcoins10
java10
standard-library10
nestjs10
arraylist10
javas10
go10
bitcoinj10
bytecode10
blockchain10
Programming languages (22)
Github contributions (5)
lightningnetwork/lnd
Jan 2020 - Jan 2023
Lightning Network Daemon ⚡️
Role in this project:
Back-end Developer
Back-end DeveloperContributions:52 reviews, 21 commits, 23 PRs in 3 years
Contributions summary:Carsten primarily contributed to fixing typos and improving documentation across multiple files within the `lnd` repository. They addressed inconsistencies in the code comments and log messages, focusing on code readability and clarity. The user also made changes related to the HTLC (Hashed Timelock Contract) switch, adding detailed log messages and fixing error handling, suggesting an understanding of the Lightning Network's core functionalities. Additionally, the user made small improvements to areas like RPC and the contract court.
cryptographypaymentsprotocoldaemonlightning
immich-app/immich
Aug 2024 - Mar 2025
High performance self-hosted photo and video management solution.
Role in this project:Back-end Developer
Back-end DeveloperContributions:9 reviews, 26 PRs, 45 pushes in 7 months
Contributions summary:Carsten primarily contributed to the server-side logic of the Immich application, focusing on fixing bugs and implementing new features. Their work involved resolving issues related to file handling, timezone parsing, and handling raw image formats. They demonstrated proficiency in working with storage repositories, metadata extraction, and album management functionalities. The user's contributions included updating dependencies and adapting the backend to handle image dimensions and deleted assets more efficiently.
videosmobile-appvideobackup-solutionbackup
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