Stephan Renatus
Software Engineer at Apple
Berlin Metropolitan Area Germany
Summary
🤩
Rockstar🎓
Top SchoolStephan Renatus is a seasoned software engineer with 13 years of experience building reliable backend systems, security-sensitive auth flows, and automation for cloud-native environments. He has driven authentication and authorization work across microservices and Kubernetes at Chef and advanced policy and runtime efficiency at Styra, contributing to the Open Policy Agent core. An active open-source contributor, Stephan has improved build and release tooling (Habitat, Omnibus), stream processing integrations (Redpanda), and gRPC error handling, showing a rare blend of DevOps, backend engineering, and documentation skills. Now based in Berlin and recently joining Apple, he pairs a master's in mathematics and computer science with practical experience fixing low-level bugs, improving compilers, and hardening distributed systems. Notably, his contributions span both developer tooling and policy engines, reflecting deep expertise in making complex infrastructure both correct and operable.
13 years of coding experience
10 years of employment as a software developer
Master's degree Mathematics and Computer Science, Master's degree Mathematics and Computer Science at Johannes Gutenberg University Mainz
English, German
Github Skills (82)
gitlab-omnibus10
package-management10
compiler-development10
testing10
oid10
rust-wasm10
ruby10
chef-client10
rego10
build-automation10
rest-api10
pony10
backend10
markdown10
debian-packaging10
Programming languages (49)
Github contributions (5)
open-policy-agent/opa
Jan 2018 - Jan 2023
Open Policy Agent (OPA) is an open source, general-purpose policy engine.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3018 reviews, 568 commits, 1550 PRs in 5 years
Contributions summary:Stephan primarily contributed to the core functionality of the Open Policy Agent (OPA) project. Their work involved implementing improvements to the Rego language and its evaluation process. The user's contributions were centered around enhancing the efficiency and reliability of the query compiler, and improving the runtime with changes focused on memoization and code generation.
policycompliancedogepoliciescloud-native
dexidp/dex
Apr 2016 - Dec 2020
OpenID Connect (OIDC) identity and OAuth 2.0 provider with pluggable connectors
Role in this project:Back-end Developer
Back-end DeveloperContributions:7 releases, 127 commits, 120 PRs in 4 years 8 months
Contributions summary:Stephan primarily contributed to the back-end logic of the `dexidp/dex` repository. Their work focused on enhancing password connector functionality, allowing for custom username prompts and improved handling of login flow. They implemented improvements to the SAML connector by adding tests, and handled LDAP integration. Additionally, the user addressed issues with the API and made general improvements to the code base.
openidoidcprovideridpoauth-2
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