Applications open for Ethereum Protocol Fellowship Cohort 6 (EPF6)

Hey folks,

Applications are now open for Cohort 6 of the Ethereum Protocol Fellowship (EPF), running June–November 2025.

If you’ve ever thought “I’d like to contribute to Ethereum core, but where do I even start?” — this is a great starting point.

Each cohort brings together a group of engineers, researchers, and curious protocol nerds to work on real projects with mentorship from client and research teams. Past fellows have contributed to things like:

• ePBS (EIP-4844 follow-up)
• Verkle trees
• PeerDAS
• Light clients
• SSZ optimizations
• Testing and tooling across the stack

This year, we have the target set on seasoned engineers ready to make meaningful contributions. You don’t need to be a “protocol wizard.” But you should be comfortable in large codebases, ready to write tests, debug weird edge cases, and iterate with feedback.

Past fellows have ended up on teams like Lighthouse, Nethermind, Prysm, or the EF R&D teams.

🧠 If you’re not ready for a full cohort, epf.wiki has resources from the Study Group — free and open to anyone.

📅 Deadline to apply: April 30

📺 We hosted a town hall where you can see some more details

More info:

• Program guide & structure: https://github.com/eth-protocol-fellows/cohort-six
• Application form: https://efdn.notion.site/1d0d98955541805481b6da8786883bb3?pvs=105
• Past projects: https://github.com/eth-protocol-fellows/cohort-five

Drop any questions below and we hope to see some of you in the cohort!