Open Source Challenges
Each adventure focuses on one open source technology, with challenges at different difficulty levels. Pick your adventure, work through real-world scenarios hands-on, and share what you learn with the community.
All Challenges
6 adventures · 17 challenges
Dead Reckoning
The Grand Fleet's commission office is buried in complaints. Manifests are filed but nothing comes of them. Vessels that do sail arrive at port with the wrong cargo, and no one along the route can explain why. As the fleet's engineer, your mission is to restore order from keel to quayside and find out what the records are hiding.
Lex Imperfecta
The Roman Republic has built a sophisticated legal system to protect its citizens — but the laws were written in haste, and the exceptions were written too generously. Policies go unenforced, the wrong citizens are exempt, and something has slipped through the gates unnoticed. As a newly appointed Praetor, your mission is to restore order before chaos takes hold.
Blind by Design
Three levels of OpenFeature with flagd as the provider, in a Java + Spring Boot service. Wire the SDK against a flagd sidecar (Beginner), layer evaluation context to target by cohort (Intermediate), then instrument flag evaluations with OpenTelemetry and roll back a misbehaving fractional rollout (Expert). All without redeploying.
The AI Observatory
Investigate a mysterious bandwidth anomaly at a remote research station by instrumenting its AI system with OpenTelemetry, OpenLLMetry, and Jaeger.
Building CloudHaven
Join the Infrastructure Guild and modernize CloudHaven's infrastructure from manual provisioning to a self-service platform using Infrastructure as Code. A hands-on journey through infrastructure as code with OpenTofu and GitHub Actions.
Echoes Lost in Orbit
Restore interstellar communications by fixing broken GitOps setups, progressive delivery systems, and observability pipelines across three galactic missions.
Challenge Builders
Adventures don't build themselves. A heartfelt thank you to everyone who has put in the time and care to create them.
DevRel at Dynatrace and co-organizer of Cloud Native Linz. Passionate about building user-friendly Cloud Native and Kubernetes solutions, with a background in mobile and backend development. Found in tech and sports communities, inline skating rinks, and quiz nights across Europe.
adventures created
CNCF Ambassador and maintainer of OpenFeature and JUnit Pioneer. Helps teams release faster and with more confidence through open standards, feature flagging, and the communities that make both possible. A familiar face at KubeCon EU, Devoxx, ContainerDays, and meetups across Europe.
adventures created
Community Leaders
Top Challenge Solvers
- theharithsa9
- gsigmund8
- iw4p8
- justinrand6
- enri-kapaj6
Challenge Grand Builders
- KatharinaSick14
Challenge Builders
- simon.schrottner3
Start Curious.Break Things.Learn Together.Glow Brighter.
You bring your questions, your fixes, your ideas. We bring the challenges, the tooling, and the practitioners who care about the same problems you do.
Every spark starts with one person. Like Nyx, our firefly, together we brighten the whole open source ecosystem.
That's OffOn. always On. always Open. always Learning.
