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Featured
Coding Contest

ARC Prize 2026 — ARC-AGI-2

by ARC Prize Foundation

$700K
Mar 25 - Nov 2, 2026
Deadline in 5 days
Advanced
Online

Browse by Category

From CTFs to hackathons, find the perfect challenge for your skill level.

342 events

Capture The Flag

Security competitions with puzzles in web, crypto, pwn, and reversing.

528 events

Bug Bounty

Find vulnerabilities in real applications and earn rewards.

285 events

Hackathons

Build innovative projects in intense 24-48 hour sprints.

892 events

Coding Contests

Algorithmic programming challenges to test your skills.

156 events

Conferences

Talks, workshops, and networking with the community.

89 events

Grants & Fellowships

Funding and mentorship for open source maintainers.

124 events

OSS Bounties

Contribute to open source and earn bounties.

Happening Soon

Bug Bounty

Optimism Bug Bounty Program

by Immunefi

$2.0M
Ongoing
No deadline
Advanced
Online
Bug Bounty

Usual Labs Bug Bounty

by Sherlock

$16.0M
Ongoing
No deadline
Advanced
Online
Grant

Ethereum Foundation Ecosystem Support Program (ESP)

by Ethereum Foundation

Ongoing
No deadline
Advanced
Online
Grant

Solana Foundation Grants

by Solana Foundation

Ongoing
No deadline
Open
Online
Featured
Coding Contest

ARC Prize 2026 — ARC-AGI-2

by ARC Prize Foundation

$700K
Mar 25 - Nov 2, 2026
Deadline in 5 days
Advanced
Online
Hackathon

Nebius x NVIDIA Global AI Hackathon

by nebius

$50K
Aug 26 - Oct 30, 2026
Deadline in 9 days
Open
Online
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