Markus Valentin
Senior Software Developer at Open-Xchange
Leipzig, Saxony, Germany
Summary
🤩
Rockstar🎓
Top SchoolMarkus Valentin is a Senior Software Developer based in Leipzig with 11 years of experience specializing in embedded systems, Linux, and bootloaders (notably U-Boot). He blends low-level firmware expertise with back-end and test automation skills, having contributed to core components of the widely used Dovecot mail server by improving authentication tests and proxy behavior. At Open-Xchange he applies this embedded-systems rigor to deliver robust server-side software, building on prior roles at L4B, DENX and Silicann where he focused on boot-time and platform integration. Markus holds an MSc in Computer Science from Universität Rostock and is known for making code more testable and maintainable—turning hard-to-test low-level functions into globally testable units.
11 years of coding experience
5 years of employment as a software developer
Bachelor of Science - BS, Computer Science, Bachelor of Science - BS, Computer Science at University of PotsdamMaster of Science - MS, Computer Science, Master of Science - MS, Computer Science at Universität Rostock
Github Skills (11)
c1710
unit-testing10
user-authentication10
authentication10
c1110
imap9
send-email9
test-automation9
sendmail9
e-mail9
mailing9
Programming languages (4)
Github contributions (5)
dovecot/core
Jun 2019 - Jan 2023
Dovecot mail server
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:2 reviews, 225 commits, 2 PRs in 3 years 7 months
Contributions summary:Markus's contributions center around enhancing the core functionality of the Dovecot mail server. They implemented unit tests for the `lib-auth` library, focusing on verifying the correct export of authentication user information. Additional work included making `auth_user_info_export` a global function for testing purposes. Furthermore, modifications were made to the `lmtp-proxy` component to pass real IP and port variables to the authentication process.
dovecotmailserverimap4pop3lmtp
vmo69/documentation
Jan 2020 - Jul 2026
doc.dovecot.org source repository
Contributions:171 pushes, 71 branches in 6 years 7 months
dovecot
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