Christoph Langer
Development Manager at SAP
Walldorf, Baden-Württemberg, Germany
Summary
🤩
Rockstar🎓
Top SchoolChristoph Langer is a development manager with over a decade of hands-on software engineering experience, currently leading teams at SAP from Walldorf, Germany. He has a deep backend systems background, evidenced by sustained contributions and maintainer roles in the OpenJDK project where he fixed compatibility issues and improved autoconf build tooling and macOS code signing. His career spans long tenures at IBM and SAP, progressing from developer to senior engineer and now into leadership while keeping active reviewer and update-maintainer responsibilities for a major open-source JVM. Christoph combines production-grade systems thinking with practical build and configuration expertise that often goes unnoticed but materially improves developer workflows and release reliability. He holds a Dipl.-Ing. in Information Technology from Berufsakademie Stuttgart and is known for bridging low-level platform concerns with team delivery and operational excellence.
10 years of coding experience
9 years of employment as a software developer
Dipl. Ing. (BA), Information Technology, Dipl. Ing. (BA), Information Technology at Berufsakademie Stuttgart
Github Skills (13)
autoconf10
javas10
build-system10
jvm10
java10
macos9
debug9
makefile9
gnu-make9
code-signing9
documentation7
concurrency6
network-programming5
Programming languages (9)
Github contributions (5)
openjdk/jdk
Sep 2020 - Mar 2025
JDK main-line development https://openjdk.org/projects/jdk
Role in this project:
Back-end Developer
Back-end DeveloperContributions:329 reviews, 78 PRs, 700 comments in 4 years 7 months
Contributions summary:Christoph contributed to the OpenJDK project by addressing compatibility issues and removing outdated code. Specifically, the user fixed a compatibility issue in AlgorithmChecker for 3rd party JCE providers and removed the `sun.nio.ch.Util.atBugLevel()` function, along with its associated volatile field. The user also made improvements to the collection management in `sun.net.www.http.KeepAliveCache`.
openjdkjavajvmjdk
openjdk/jdk11u
Jan 2023 - Feb 2023
Role in this project:Backend Developer
Backend DeveloperContributions:9 reviews, 7 commits, 16 PRs in 27 days
Contributions summary:Christoph contributed to the OpenJDK project by modifying build configuration files, specifically related to the `autoconf` build system. Their work included introducing and modifying macros, particularly for argument handling (`UTIL_ARG_WITH`, `UTIL_DEFUN_NAMED`) and code signing on macOS. Additionally, they addressed issues with string expansion in macros and updated documentation related to building the JDK.
sdkupdatesjdkopenjdkjava
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