DevDay Exchange Community: Paris

​Build online. Demo in Paris.
Join Paris builders for a community hackathon ahead of DevDay Exchange. Create a project with Codex or the OpenAI API, then join an evening of demos, judging, and conversation.

​Hosted by Hexa and Boris de Wit, your local Codex Ambassador. Supported by the North Star team and Oleksandr Tsepukh, Codex Ambassador from Belgium

​10 tickets to DevDay Exchange

​Compete for one of 10 tickets to the official DevDay Exchange in Paris on 28 October.

​How it works

​24–26 October · online build weekend

• ​Join the online kickoff on 24 October at 10:00 AM, Paris time, and meet fellow builders.

• ​Come with a team or work solo. There will be time to form teams at the kickoff. Teams can have up to 4 people.

• ​Build with Codex or the OpenAI API

​26 October · Demo night

• ​Present your project in a short demo with Q&A.

• ​Get feedback from judges and fellow builders.

• ​Celebrate the winners and meet the Paris community.

​Choose your ticket

• ​Hackathon participants: join the online build phase, kickoff, and demo night.

• ​Demo night visitors: come along on 26 October to watch the demos, meet builders, and celebrate the winners.

​Finale programme

• ​18:00 — Doors open, introductions, and final demo preparation

• ​18:30 — Welcome & learn what's new in Codex

• ​19:00 — Project demos and Q&A

• ​20:30 — Winners announced, celebrate with snacks and drinks 🤩

• ​22:00 — Event ends

​When

• ​Online kickoff: Saturday, 24 October 2026 at 10:00 AM, Paris time

• ​Online build phase: 24–26 October 2026

• ​In-person finale: Monday, 26 October · 18:00–22:00, Paris time

​The date and time at the top of this page refer to the in-person finale.

​Our host, Hexa, is a startup studio, partnering with founders to build ambitious companies from day zero.

​This community-led hackathon is separate from the official DevDay Exchange in Paris on 28 October. Registration does not include admission to the official event.