CALL-E: Your Code Is Calling Online Turn your code into an AI agent that makes real phone calls. $10,000 in prizes Sep 14, 2026 11:45 AM EDT to submit 2486 participants
Build with DataHub: The Agent Hackathon Online Build AI agents with DataHub's open-source Context Platform. $20,500 in prizes Winners TBD 3074 participants
OpenAI Build Week Online Join a global week of building with Codex $100,000 in prizes Winners announced 46726 participants
Slack Agent Builder Challenge Online Whether it's your first agent or your fiftieth - Slack is where it ships. $42,000 in prizes Winners announced 4425 participants
GitLab AI Hackathon Online You Orchestrate. AI Accelerates. $65,000 in prizes Winners announced 6936 participants
Dev Season of Code Online Build. Learn. Ship. Scale. Non-monetary prizes Winners announced 1003 participants
Elasticsearch Agent Builder Hackathon Online Build context-driven agents fast with Elasticsearch $20,000 in prizes Winners announced 2097 participants
Datathon 2026: Data4Good Santa Barbara, CA, USA Collaborate, innovate, and build data-driven solutions to tackle real-world challenges and shape the future of technology. $3,500 in prizes Feb 21 – 22, 2026 100 participants
RevenueCat Shipyard: Creator Contest Online Collaborate with creators to build their app in 1 month $165,000 in prizes Winners announced 7058 participants
The Reddit Daily Games Hackathon Online Join Reddit and GameMaker to build incredible daily games for the Reddit community! $40,000 in prizes Winners announced 2982 participants
PROMPT. TRAIN. PARTY — Hack Days (MLH) Online An overnight online hackathon where students build fast, experiment with AI, and turn ideas into prototypes using Google Gemini. Non-monetary prizes Winners announced 92 participants
DeveloperWeek 2025 Hackathon Santa Clara, CA, USA Join the nation's largest challenge-driven in-person and online hackathon @ DeveloperWeek 2025! $24,400 in prizes Jan 27 – Feb 13, 2025 1376 participants
Tableau DataDev 2024-2025 Hackathon Online Get ready! Get set! HACK and customize Tableau! $1,800 in prizes Winners announced 1228 participants