Jan Schmitz-hermes
Managing Director & Founder at L21s
Cologne, North Rhine-Westphalia, Germany
Summary
👤
Senior🎓
Top SchoolJan Schmitz-hermes is a founder and managing director with 11 years of experience blending hands-on software engineering, IT architecture and strategic consulting to modernize legacy systems—especially in finance and insurance. After roles at IBM and BCG Platinion he launched L21s to help firms turn business cases into production-ready features, revive aging backends, and make customer journeys mobile-first. He combines pragmatic engineering (microservices, DevOps, security) with structured requirements analysis and project governance to de-risk delivery. An active contributor to notable open-source tooling—improving reliability and security in projects like a Keycloak config CLI and the Jenkins HashiCorp Vault plugin—he focuses on practical changes that increase resilience and operability. Based in Cologne, he pairs technical depth from KIT and Wirtschaftsinformatik studies with a founder’s appetite for shipping measurable business value.
11 years of coding experience
5 years of employment as a software developer
Master of Science - MS Service Management and Engineering, Master of Science - MS Service Management and Engineering at Karlsruhe Institute of Technology (KIT)Bachelor of Science (B.Sc.) Wirtschaftsinformatik, Bachelor of Science (B.Sc.) Wirtschaftsinformatik at The Berlin School of Economics and Law
Github Skills (23)
keycloak10
hashicorp-vault10
secret-management10
configuration-management10
java10
configuration-as-code10
javas10
spring-boot10
jenkins-plugin10
jenkins10
jenkins-ci10
api-design9
restful-api9
testing9
api-rest9
Programming languages (10)
Github contributions (5)
jenkinsci/hashicorp-vault-plugin
Apr 2017 - Apr 2017
Jenkins plugin to populate environment variables from secrets stored in HashiCorp's Vault.
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:19 commits, 4 PRs, 9 comments in 4 days
Contributions summary:Jan primarily focused on enhancing the Jenkins plugin's authentication mechanism, transitioning from token-based to AppRole authentication for improved security. They implemented changes to the plugin's configuration, adding support for Role ID and Secret ID credentials within the VaultBuildWrapper, and integrating them with the Vault API. Furthermore, the user updated the test suite to accommodate the new authentication method. In addition, the user made some changes to handle trailing slashes in the URL to provide a better user experience.
hashicorpjenkins-pluginvaultjenkinssecrets
adorsys/keycloak-config-cli
Jan 2022 - Jan 2022
Import YAML/JSON-formatted configuration files into Keycloak - Configuration as Code for Keycloak.
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 review, 9 commits, 2 PRs in 3 days
Contributions summary:Jan focused on improving the configuration and resilience of the Keycloak configuration CLI. They added the ability to configure timeouts for the REST client used to communicate with Keycloak, including connect and read timeouts. The user refactored the code to use `Duration` objects for timeout configurations and implemented integration tests to ensure the timeout settings are correctly applied and tested. These changes enhance the reliability and configurability of the CLI.
configuration-as-codekeycloakyamljbossautomation
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