always On.always Open.
A welcoming community for open source enthusiasts. Learn through hands-on challenges, share your knowledge, and grow alongside people who love open source as much as you do.
Choose Your Adventure
5 adventures · 14 challenges
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.
Learn by Doing
Real-world, hands-on challenges. Broken pipelines, misconfigured systems, and more. All running in your browser via GitHub Codespaces, no setup needed.
Build Real Skills
Build practical, hands-on experience with every challenge. Earn Credly badges and leaderboard points along the way.
Open Source First
Everything runs on open source tools. Vendor-neutral and free from proprietary lock-in. Open, transparent, and reproducible by anyone.
Got an Ideafor an Adventure?
Shape what the community learns next. Submit a scenario and help it become the next adventure.
Get Involved
The community is where open source comes alive. Share what you know, ask for help, meet the people behind the projects, and find events near you.
Community Voices
Share tutorials, showcase projects, post open source news, and write about what you have learned. The home for community-created content.
Share Something (opens in new tab)Q&A
Stuck on a technical problem or not sure where to start? Post a question and get answers from the community. No question is too basic.
Ask a Question (opens in new tab)Introduce Yourself
New here? Tell us about yourself. Share your role, what you're building or learning, and one thing you want to get out of the community.
Say Hello (opens in new tab)Events & Meetups
Find upcoming events, add local meetups to the community calendar, and connect with members in your city.
See Upcoming Events (opens in new tab)Community Leaders
Top Contributors
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Top Challenge Solvers
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Most Liked
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That's OffOn. always On. always Open. always Learning.
