Juho Saarinen
Test & DevOps Architect at Witted Mavericks
Helsinki, Finland
Summary
🤩
Rockstar🎓
Top SchoolJuho Saarinen is a Test & DevOps Architect with 13 years of experience designing resilient testing and CI/CD platforms across cloud providers (AWS, GCP, Azure) and agile teams in Helsinki. He combines a strong grounding in test automation, performance testing and Scrum with hands-on DevOps engineering—contributing to notable open-source projects like the GitHub Actions runner controller (DinD support, GHE configuration, token handling) and projen (release/versioning automation). His background in theoretical physics (MSc) informs a methodical, measurement-driven approach to system reliability and optimization. At Witted Mavericks he architects testable, cloud-native delivery pipelines while earlier roles at Eficode and Sogeti emphasize leadership in testing transformation and automation. Colleagues describe him as someone who bridges deep technical detail and pragmatic delivery, improving developer workflows and release hygiene behind the scenes.
13 years of coding experience
Master of Science (M.Sc.), Physics, mathematics, theoretical physics, Master of Science (M.Sc.), Physics, mathematics, theoretical physics at University of Helsinki
Stackoverflow
1reputation
294reached
1answer
1question
Github Skills (30)
kubernetes10
github-ci10
javascript10
docker10
typescript10
dockers10
cicd10
go10
typescript-types10
kubernetes-pods10
nodejs10
typescripts10
githubaction-workflow10
repos9
apidoc8
Programming languages (14)
Github contributions (5)
projen/projen
Nov 2021 - Sep 2022
Rapidly build modern applications with advanced configuration management
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:20 reviews, 5 commits, 5 PRs in 10 months
Contributions summary:Juho's contributions primarily focused on enhancing the repository's build and release processes. They implemented features for customizing versioning configurations, excluding packages from upgrade tasks, and configuring Renovatebot. The user also worked on improving the project's test suite and resolving dependencies, demonstrating a focus on maintainability and automation. These changes streamlined the project's release workflow and dependency management.
scaffoldingrepository-toolstemplatesgeneratorsrepository-management
actions/actions-runner-controller
Oct 2020 - Dec 2020
Kubernetes controller for GitHub Actions self-hosted runners
Role in this project:DevOps Engineer & Backend Developer
DevOps Engineer & Backend DeveloperContributions:7 reviews, 10 commits, 12 PRs in 1 month
Contributions summary:Juho primarily focused on enhancing the functionality and flexibility of the GitHub Actions runner controller. They implemented features to support Docker-in-Docker (DinD) within the runner, enabling more complex build scenarios. Additionally, the user addressed issues related to restarting pods upon completion and added support for configuring GitHub Enterprise (GHE) URLs. They also made improvements to token handling.
controllerhostedrunnersoperatorself-hosted-actions
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