Daniel Fesenmeyer
Software Engineer at Bosch_IO
Görlitz, Saxony, Germany
Summary
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RockstarDaniel Fesenmeyer is a software engineer with 11 years of experience specializing in Java back-end development, based in Görlitz, Germany. He contributes to prominent open-source projects such as Keycloak and Eclipse Ditto, where he has improved identity search APIs, role handling, localization, and error reporting. Daniel's work shows attention to integration testing, package consistency, and practical interoperability between federated identity systems and services. He combines steady maintenance-oriented craftsmanship with targeted feature enhancements that reduce ambiguity for integrators and operators. Colleagues can expect a developer who values clear error semantics, Unicode-friendly localization, and durable API changes that improve real-world deployments.
11 years of coding experience
Github Skills (12)
keycloak10
javas10
test-integration10
rest-api10
oid10
refactoring10
exception-handling10
java10
integration-testing10
api-design9
saml9
maintainability9
Programming languages (6)
Github contributions (5)
eclipse-ditto/ditto
Oct 2017 - Mar 2019
Eclipse Ditto™: Digital Twin framework of Eclipse IoT - main repository
Role in this project:
Back-end Developer
Back-end DeveloperContributions:308 commits, 25 PRs, 11 pushes in 1 year 5 months
Contributions summary:Daniel's contributions focused on resolving exceptions in the aggregation query actor, and refactoring package naming for consistency with existing services. They aligned package naming with other Ditto services by ensuring that package names started with "org.eclipse.ditto.services" instead of "org.eclipse.services". They also added license headers and implemented the addition of a GatewayJwtIssuerNotSupportedException to provide a more descriptive error message.
eclipse-dittoeclipseiotiotinternet-of-thingsdigital-twin
keycloak/keycloak
Jul 2020 - Nov 2022
Open Source Identity and Access Management For Modern Applications and Services
Role in this project:Back-end Developer
Back-end DeveloperContributions:29 reviews, 10 commits, 34 PRs in 2 years 4 months
Contributions summary:Daniel contributed to the Keycloak project by extending the Admin REST API to support searching users by federated identity information. They added new parameters and attributes to facilitate this functionality and enhanced integration tests to validate the changes. They also made improvements to role creation, ensuring attributes are saved during the creation process and updated client and realm role mappings. The user further addressed localization issues by supporting Unicode characters for realm localization texts.
access-managementkeycloakoidcsaml
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