Maxim Sirenko brings a distinctly hands-on operating background to his investing, shaped by his time at Starlink where he owned the critical path by sending daily emails naming the top blockers and assigning someone to fix each one, and by SpaceX's Responsible Engineer approach, where one person owns a problem without passing blame. He applies lessons like questioning every requirement to cut complexity, believes you can't fix what you don't understand, which is why he backed Goodfire's interpretability work, and tends to back operators he's seen perform firsthand, such as Benjamin Longmier and Sara Spangelo from his time at SpaceX.
About their Fund
DFJ Growth was founded in 2005 on the idea that strong tech companies would stay private longer and need a new kind of investor between venture capital and public markets, and it has grown independently from DFJ's earlier-stage arm, typically investing $10M–$25M in companies already growing over 100% a year with real product-market fit. The firm pairs capital with hands-on operating help from people who have scaled companies themselves, and it looks for founders solving big problems in areas like hardware, robotics, government and commercial dual-use, life tech, and consumer—not just enterprise software—often backing categories like electric vehicles, space, and crypto before they were widely popular, with early examples including Tesla, SpaceX, Coinbase, Unity, and Twitter.

















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