One year ago Marco De Leon embarked on a year long Brink fellowship in our London office. Today, after a year of progress and contributions, we’re happy to bring him on as a full-time Bitcoin Core engineer!
"The idea of diving into a codebase as critical and complex as Bitcoin Core’s was intimidating, and frankly, I was a bit worried I didn’t have enough experience to contribute meaningfully. The fellowship provided the perfect bridge..."

Marco
Marco De Leon recounts his experiences and accomplishments during his year long fellowship.
Marco, with guidance from his mentor Niklas Gögge, focused his fellowship on fuzz testing, a technique for catching subtle bugs and security vulnerabilities.

Niklas Gögge on Fuzz Testing
Niklas Gögge on Fuzz Testing.
His work took him from improving existing fuzz tests, to removing the longstanding mainnet checkpoints, to improving type safety in the Bitcoin Core codebase.
We are proud of Marco and Niklas for their efforts this past year. Bitcoin is more secure because of Marco's contributions and Bitcoin is stronger with another experienced engineer working on security into the future.
If you're interested in fuzzing and a career as an open source Bitcoin engineer, like Marco, we are pleased to offer, in addition to the fellowship, a new Bitcoin Core Fuzzing Internship at Brink
Join us and contribute to Bitcoin security through fuzzing!

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