Tim Beiko is a Canadian software developer and angel investor best known for his central role in coordinating Ethereum protocol development at the Ethereum Foundation. He served as the primary facilitator of the All Core Developers (ACD) calls – the main technical coordination forum for Ethereum client teams – and played a pivotal part in shipping some of the network's most consequential upgrades, including The Merge in September 2022, which transitioned Ethereum from proof-of-work to proof-of-stake.
Before joining the Ethereum Foundation, Beiko worked at ConsenSys, giving him early exposure to Ethereum's developer tooling and application ecosystem. His engineering background and deep network within Ethereum's core protocol community inform his investing perspective. He operates as an individual angel investor rather than through a formal fund, with no disclosed AUM. His investments number around five known deals, all concentrated in the Ethereum ecosystem.
Notable investments
Beiko's portfolio is small and focused. Public information about the specific names of all five investments is limited; he has not published a comprehensive portfolio list. His known or reported angel activity spans early-stage infrastructure and developer tooling projects building on Ethereum. Given his background coordinating protocol upgrades across client teams, his deal flow is understood to come primarily through direct relationships with Ethereum core contributors and researchers rather than through traditional pitch processes.
Team
Tim Beiko invests independently. There are no managing partners, associates, or formal fund structure. He makes investment decisions individually, drawing on his technical expertise in Ethereum protocol design, EIPs (Ethereum Improvement Proposals), and client interoperability. He is active on X (formerly Twitter), where he regularly comments on Ethereum development and occasionally signals interest in ecosystem projects.
Recent activity
In 2024 and into 2025, Beiko remained closely involved in Ethereum's upgrade roadmap, helping coordinate the Cancun-Deneb (Dencun) upgrade shipped in March 2024, which introduced proto-danksharding (EIP-4844) and significantly cut Layer 2 transaction costs. His public focus during this period shifted toward Ethereum's longer-term scaling and censorship-resistance roadmap. No new angel investment announcements were made publicly in this window, consistent with his low-profile approach to private investing.
As an investor, Beiko's edge is access rather than capital – his proximity to Ethereum's core development pipeline gives him early visibility into promising infrastructure teams. His portfolio remains deliberately small. Investors and founders seeking insight into Ethereum's technical direction watch his public commentary closely. Public information about his investment returns or any portfolio exits is not available.
