Track 01
Test Something Real
$2,000
In cash
Build an app and run a real A/B test on it with Flagsmith Experimentation.
Nov 26–29, 2026Online
TGGLEWARS
The Flagsmith Experimentation Hackathon
01 / The challenge
How a round is played
Build a project with Flagsmith. Use feature flags to ship it, and use Experimentation to find out which version wins.
Create a flag
A multivariate flag holds the versions you want to compare.
Pick a metric
Choose the event that counts as success, like a click or a sign-up.
Split the traffic
Decide how many users join the test and how they are split.
Ship the winner
Flagsmith shows the win probability for each version. Roll the winner out with the same flag.
Set it up with one prompt
Paste Flagsmith's setup prompt into Claude Code or any coding agent. It creates the flag, the metric and the experiment, and adds the code to your app after you approve it.
Get the promptSample experiment
Flag on
5.1%
Flag off
4.2%
94% chance that on wins
02 / Tracks & prizes
Three tracks, three prizes
Pick the track your idea fits. The best project in each one takes that track's prize.
Track 02
AI Agents and Feature Flags
$1,000
In cash
Build an agent or a tool that works with Flagsmith for you, like setting up experiments from a prompt.
Track 03
Build on Open Source Flagsmith
PS5 + GTA 6
The bundle
Run Flagsmith yourself and build around it: an integration, a dashboard, a plugin or a starter template.
Bonus prize
Star Flagsmith, win AirPods
One person who stars Flagsmith on GitHub is picked at random and wins a pair of AirPods.
03 / Judging
The scorecard
What the judges look at in every project, whichever track it's in.
Judge's scorecard
Use of Flagsmith
Is Flagsmith a core part of the project? Do the flags or the experiments do real work?
Impact
Does it solve a real problem? Would a developer or a team actually use it?
Creativity
Is the idea new, or does it take a familiar idea somewhere new?
Demo video
Does the video clearly show the problem, what you built and how Flagsmith fits in?
What the judges look for in each track
Track 01
Test Something Real
- A clear question to test
- Versions behind a flag
- A metric from real events
- Results you can explain
Track 02
AI Agents and Feature Flags
- Flagsmith CLI, API or MCP server
- Saves real time
- A human approves changes
- Clear output
Track 03
Build on Open Source Flagsmith
- Self-hosted Flagsmith
- Integrations and plugins
- Developer tools
- Easy for others to reuse
04 / Sponsor
Powered by Flagsmith
Flagsmith is an open-source feature flag platform. Turn features on and off without a redeploy, release them to the right users, and test them with Experimentation.
Main sponsor
Experimentation is Flagsmith's new A/B testing product. It runs on the feature flags you already use, collects your app's events, and works out which version wins with a built-in Bayesian stats engine.
Use Flagsmith Cloud, or self-host it with Docker. Use the managed data warehouse, or bring your own ClickHouse or Databricks.
SDKs that support Experimentation
- JavaScript
- React
- Python
- Java
- Node.js
- Go
- Flutter
New to A/B testing?
The Resources tab has the docs, a demo video, a full example and short guides to A/B testing.
05 / FAQ
Got questions?
When is the hackathon?
November 26 to 29, 2026. Hacking starts at 8 AM IST on November 26, and submissions close at 8 PM IST on November 29.
Who can take part?
Developers from anywhere in the world. The hackathon is online and free to enter.
Can I build on my own?
Yes. You can build solo or with a team.
Do I need to know Flagsmith already?
No. The Resources tab has the docs, a demo video and guides to get you started.
Do I have to use Flagsmith?
Yes. Flagsmith has to be a core part of your project.
Is Flagsmith free to use?
Flagsmith is open source, so you can self-host it for free. You can also start on Flagsmith Cloud for free.
Can I use AI coding tools?
Yes. Flagsmith even has a setup prompt for coding agents. You still need to understand and explain what you built.
What are the prizes?
Each track has its own prize for its best project. Track 01 wins $2,000 in cash, Track 02 wins $1,000 in cash, and Track 03 wins a PS5 + GTA 6 bundle. One person who stars Flagsmith on GitHub also wins AirPods.
Where do I register?
Right here. Sign in or create a free WeMakeDevs account, then click Register now on this page.
Where can I get help?
Ask in the Flagsmith Discord. The Flagsmith team is there to answer questions.