Gregor Zeitlinger
Senior Software Engineer at Grafana Labs
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolGregor Zeitlinger is a senior software engineer based in Berlin with 18 years of experience building reliable back-end systems and shaping developer tooling at scale. He has driven production-ready work at Grafana Labs and Zalando and previously led engineering teams as Head of Development, demonstrating both hands-on coding and technical leadership. An active open-source contributor, Gregor has improved instrumentation and observability projects such as Prometheus and OpenTelemetry—contributions that emphasize code quality, metrics correctness, and test reliability. He also brings full-stack and DevOps experience from projects like FreeCol and Kubernetes-on-AWS, where he focused on UI improvements, platform integration, and robust deployment practices. Colleagues would describe him as pragmatic and detail-oriented, often tackling subtle bugs (nil dereferences, variable shadowing) and systemic improvements that prevent future issues.
18 years of coding experience
14 years of employment as a software developer
Abitur, 1,6, Abitur, 1,6 at Heinrich-von-Kleist GymnasiumDiplom, Computer Science, 1,4, Diplom, Computer Science, 1,4 at Humboldt University of Berlin
English, German
Stackoverflow
371reputation
25kreached
29answers
0questions
Github Skills (46)
kotlin10
url-routing10
kubernetes10
reverse-proxy10
cloud-computing10
apidoc10
api-design10
testing10
instrumentation10
java10
2d-game10
javas10
go10
api10
sdk10
Programming languages (19)
Github contributions (5)
zalando/zally
Mar 2019 - Feb 2021
A minimalistic, simple-to-use API linter
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 2 reviews, 84 commits in 1 year 11 months
Contributions summary:Gregor primarily contributed to refactoring and improving the code base, focusing on immutability and nullability to improve readability. They removed unnecessary `@Autowired` annotations in constructors, reflecting familiarity with Spring Boot best practices. The commits demonstrate modifications to testing files, suggesting a focus on ensuring code quality and verifying API behavior. Further commits updated the kotlin version and plugins.
golangapilinterspring-bootapi-use
open-telemetry/opentelemetry-java-instrumentation
Apr 2020 - Apr 2025
OpenTelemetry auto-instrumentation and instrumentation libraries for Java
Role in this project:Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:532 reviews, 152 PRs, 1 branch in 5 years
Contributions summary:Gregor's contributions primarily focused on improving the instrumentation and testing of the OpenTelemetry Java instrumentation library. They implemented changes to ensure proper unit usage in metrics and added configurations. Additionally, the user worked on enhancing the test suite to validate functionality and ensure code quality. They were also responsible for updating dependencies.
instrumentationinstrumentation-librariesjava-agenttracingauto-instrumentation
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