B4OS · Schedule

B4OS timeline

Learn about the important dates of the B4OS 2025-2026 program

1. Aug. 11 to Oct. 15, 2025Completed

   Open registration

   Registration of participants for the B4OS 2025-2026 program.

2. Sept. 15, 2025Completed

   Code challenges begin

   Let's see your programming level and Bitcoin knowledge. This stage is an asynchronous phase on Discord without classes or mentoring, but with community support.

   The best developers move on to the next stage.

   Rookie award: $300 USD for the best code from new developers who have never participated in B4OS, BOSS, or other programs.

3. Oct. 20, 2025Completed

   First phase of code challenges ends

   Selection of developers.

4. Oct. 30, 2025Completed

   Division into tracks

   From October 30, 2025 to February 2026: portfolio building and FOSS contribution. Seminars, working groups, bitdevs and meetups (5 months online).

   Paths

   • Bitcoin Core protocol developer
   • Lightning Network protocol developer
   • Application developer
5. Dec. 2025Completed

   South America residency selection

   Evaluation based on Proof of Work in Open Source projects and course participation. Both routes merge and continue working on projects.

   In exceptional cases, developers may also be selected in January.

6. Feb.-Mar. 2026Completed

   South America in-person residency

   2-week immersive experience in Florianópolis, Brazil. Direct work with mentors and peers on high-impact projects.

7. Apr. 2026Completed

   Assignment of new fellows

   Allocation of funding for new program fellows. In exceptional cases, fellowships could be awarded at any time before April 2026.

Cohorts