Bountys for developers
3 open bounty opportunities for software developers, each checked against the organizer's official page.

Bounty
Rolling
Microsoft Open Source Bounty Program
Microsoft pays $750 to $15,000 USD for qualifying security vulnerabilities in open source projects such as Visual Studio Code, TypeScript, PowerShell 7 and the Azure SDKs. Submissions are accepted on a rolling basis.
AmountBounty awards from $750 to $15,000 USD
DeadlineRolling
ByMicrosoft Security Response Center

Bounty
Rolling
ProjectDiscovery OSS Bounty Program
ProjectDiscovery pays bounties for bug fixes, features, performance work and docs in its open source security tools. Each issue shows its reward. Open to anyone, no deadline.
AmountNot stated
DeadlineRolling
ByProjectDiscovery

Bounty
Rolling
GitHub Bug Bounty Program
GitHub pays $250 to $10,000 per valid report in its public bug bounty and $30,000 or more for critical findings in the invite only VIP tier. Open year round on HackerOne.
Amount$250 to $10,000 per report in the public program, $30,000 or more for critical vulnerabilities in the VIP program
DeadlineRolling
ByGitHub