OpenAI Build Week Online Join a global week of building with Codex $100,000 in prizes Winners announced 46674 participants
Multiagents Hackathon Greater London, United Kingdom tokens& Hacks lands in London. Build something real with multi-agent systems and learn from the teams actually building the tools. £9,500 in prizes Jun 26, 2026 82 participants
HackUPC 2026 Barcelona, Spain BarcelonaTech student Hackathon. 700 hackers, 36 hours of coding. Dream it. Hack it. Ship it. Non-monetary prizes Apr 24 – 26, 2026 588 participants
HackSussex 2026 Falmer, United Kingdom An in-person hackathon taking place at the University of Sussex, UK. £200 in prizes Feb 28 – Mar 1, 2026 267 participants
HackEurope Ireland Europe's Largest Student Hackathon. €50,500 in prizes Feb 21 – 22, 2026 761 participants
Hackhub by Sparkhub 2025 Online Code for Change: Building Solutions for Minds, Futures, and Opportunity. $175 in prizes Winners announced 290 participants
