B4OS — Application

Apply to the program

Applications for cohort Q3 2025 are open. The process takes approximately 2 weeks from your application to the final decision.

Requirements

  • Strong experience in C++, Rust or Python (2+ years)
  • Basic familiarity with the Bitcoin protocol
  • Availability for full-time dedication (40h/week)
  • Genuine motivation to contribute to Bitcoin open source
  • Technical English level to read documentation and PRs

Selection process

  1. Complete the application form (15–20 min)
  2. Initial review by the team (1 week)
  3. Technical interview with a mentor (1h)
  4. Final decision and onboarding

Apply now

Open application form

Limited to 8 participants per cohort.