START HACK
Vienna ’26

24 hours. 4 real cases. 100 builders.
One weekend that hits.

Backed by builders, for builders

The cases

Pick a case partner. Build something they actually want.
More cases announcing soon.

fonio.ai

Real-time voice agents that hold a conversation, retrieve context, and act — without latency that breaks the illusion.

What you’ll build: A working voice-AI feature on top of fonio’s infra: a use case, a demo, and a pitch on why their voice stack should power it.

Four case partners bring problems they actually want solved. Pick your case, get matched with a team, build for 24 hours.

Engineers and founders from each case partner are on-site to help you make decisions and unblock your build.

Track Winners, Overall Winner, and a crowd-voted Community Award. Plus an MIT-licensed GitHub project to take with you.

Builders, students, engineers, designers, PMs, founders, operators.

Teams of 2–4. Solo? We'll match you on-site. No solo builds.

Yes. Free food, drinks, and tool credits. Just bring your laptop.

Starts Saturday, ends Sunday. Four Track Winners, one Overall Winner.

10,000+ EUR total, trophies, Community Award, and an MIT project.

English. Vienna is international (so are you).

Step 01
Apply
Request to Join on Luma. Approval-based, rolling. Apply early, hear back fast.
Step 02
Get matched
Bring a team of 2–4 or come solo and we’ll match you on-site. Pick your case, meet your partner.
Step 03
Build for 24 hours
Code, design, ship. Mentors from each case partner stay in the room. Catering, food truck, coffee on the house.
Step 04
Pitch to the jury
Code freezes Sunday at 14:00. Each case partner picks their Track Winner. The four winners then pitch to an external jury of VCs and founders.
Step 05
Win
Track Winners, an Overall Winner trophy, and a crowd-voted Community Award. Plus a public MIT-licensed GitHub project for everyone.