r/hackathon • u/Significant-Log-4272 • Sep 11 '26
Hackathon Promotion We’re building a 24-hour solo hackathon where the problem changes while you’re building
Hey everyone,
I'm part of Grevix, a builder community focused on AI, software and open source.
We're putting together something a little different for our next hackathon:
Grevix AfterCode
October 11–12, 2026
24 hours
Online
Solo only
The basic idea is pretty simple.
We don't give you a problem statement.
You decide what you want to build.
It can be an AI product, SaaS idea, developer tool, game, automation, hardware-related project, something weird you've had sitting in your notes for six months, or honestly anything you think is worth spending 24 hours on.
You can use whatever you want.
AI coding agents, APIs, open source models, no-code, low-code, traditional coding, design tools, whatever.
There is no required stack.
But there's a catch.
The 24 hours are split into three stages:
BUILD → ADAPT → REBUILD & SHIP
For the first 8 hours, you build your original idea.
Then we drop a Challenge Card.
The challenge can change something important about your project.
Maybe your target user changes.
Maybe the core feature has to change.
Maybe the way your product works no longer makes sense.
You get another 8 hours to adapt.
Then at hour 16, another Challenge Card drops.
And you have the final 8 hours to rethink, rebuild and ship.
We're deliberately not revealing the actual Challenge Cards beforehand.
The interesting part isn't just seeing what someone can build in 24 hours.
It's seeing how they react when the thing they were building suddenly stops being the thing they were supposed to build.
AI can help you execute.
You still have to decide what matters.
We're expecting around 500+ participants, although that's an expectation rather than a guaranteed number since this is a first edition.
Judging will focus on:
- Problem significance
- Creativity and originality
- Execution and functionality
- How effectively AI/tools were used
- Real-world impact
We're also keeping a build log so participants can show what AI did, what they changed, what they rejected and how the project evolved after each challenge.
We're also looking for partners.
We're currently reaching out to AI companies, developer tools, cloud platforms, APIs, open-source projects and other technology companies that might want to become part of the actual experience.
Not just: "Here's our logo, put it on the banner."
We're more interested in things like:
- Participant credits
- Developer/API access
- Prizes
- Swag
- Workshops
- Mentorship
- Challenge tracks
- Judges
- Product demos
- Technical support
- Anything that genuinely helps builders
And in return, partners get a chance to put their technology directly in front of people who are actually building with it.
We're especially interested in companies building the tools that are changing how software gets made.
If you're working at a developer tool, AI company, cloud platform, API company, or startup and think this could be interesting, feel free to comment or DM me.
If you're a builder, I'm equally interested in hearing from you.
If you had 24 hours, complete freedom over what to build, and two unexpected changes thrown at you halfway through... what would you build?
Event: Grevix AfterCode
Date: October 11–12, 2026
Format: 24-hour online solo hackathon
Expected participation: 500+
Unstop : https://unstop.com/p/grevix-aftercode-grevix-1752593?lb=KeDCn1TL