Abubakar Sadiq Ismail

Abubakar Sadiq Ismail contributes full-time to Bitcoin Core from 2140's Bitcoin protocol development office in Amsterdam, sponsored by Btrust and 2140. He grew up in Nigeria and earned a B.Tech in Computer Science from Modibbo Adama University in Yola. He worked as a backend developer before discovering Bitcoin development through the Btrust Builders Fellowship (formerly Qala). In 2023 he left his job to contribute to Bitcoin Core full-time. He has since worked on fee rate estimation, the mempool and other critical components, and he interned at Chaincode Labs in 2024. He mentors new contributors through Btrust Builders and Summer of Bitcoin, and sometimes hosts the Bitcoin Core PR Review Club.

Short version: Abubakar Sadiq Ismail is a full-time Bitcoin Core contributor at 2140 in Amsterdam, supported by Btrust. He works on fee estimation and the mempool, and he mentors new contributors through Btrust Builders and Summer of Bitcoin.