Lutz Schmidt - Retired, But Open To Interesting Opportunities at Ex: SAP SE

Lutz Schmidt

Retired, But Open To Interesting Opportunities at Ex: SAP SE

Nußloch, Baden-Württemberg, Germany

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Summary

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Rockstar

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Top School

Lutz Schmidt is a retired Principal Software Engineer with over three decades of professional experience and 12 years counted in the provided summary, now based in Nußloch, Germany, and open to interesting technical engagements. He spent his career at SAP SE, advancing from software engineer to principal roles and bringing deep systems-level expertise to large-scale enterprise software. An active contributor to OpenJDK, Lutz focused on HotSpot JVM internals, optimizing S390 architecture support, vector operations and AES instruction handling—work that directly improved Java runtime performance on IBM hardware. He holds a Ph.D. spanning mathematics, computer science and electrical engineering from the University of Karlsruhe (KIT), reflecting a strong theoretical foundation paired with pragmatic implementation skills. Now enjoying a less hectic life after retirement, he selectively pursues meaningful, fun challenges where low-level systems knowledge and long-term product stewardship add clear value.

12 years of coding experience

32 years of employment as a software developer

Doctor of Philosophy (Ph.D.), Mathematics and Computer Science, Electrical Engineering (cross-topic), Doctor of Philosophy (Ph.D.), Mathematics and Computer Science, Electrical Engineering (cross-topic) at University of Karlsruhe (now called KIT)

English, German

Github Skills (7)

javas10

openjdk10

code-generation10

jvm10

performance-optimization10

back-end-development10

java10

Programming languages (1)

Java

Github contributions (5)

openjdk/jdk

Jan 2023 - Jan 2023

JDK main-line development https://openjdk.org/projects/jdk

Role in this project:

Back-end Developer

Contributions:382 reviews, 1 commit, 22 PRs in 1 day

Contributions summary:Lutz primarily contributed to the Hotspot JVM codebase, focusing on low-level system-specific implementations. Their work involved optimizing and extending the S390 architecture's instruction set, specifically concerning vector operations and AES encryption instructions. This work includes changes to the assembler, and macroAssembler to support new hardware and improve performance. The user addressed issues related to code generation and memory management within the Java runtime environment.

openjdkjavajvmjdk

RealLucy/jdk11u-dev

Jul 2021 - Jan 2025

https://openjdk.java.net/projects/jdk-updates/

Contributions:22 pushes, 16 branches in 3 years 6 months

openjdk-javasdkupdatesjdkopenjdk

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