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Poseidon Aerospace
Poseidon Aerospace is a San Francisco startup building unmanned cargo aircraft designed to move heavy loads to places without runways. Founded in 2024 by ex-Amazon engineer David Zagaynov and ex-Lockheed Martin engineer Parker Tenney, the company is developing two purpose-built autonomous platforms - Egret, a short takeoff and landing aircraft, and Heron, an amphibious seaplane - each engineered to carry up to two tons roughly 1,500 miles. Backed by an $11M seed round led by Tamarack Global, Poseidon aims to slash the cost-per-ton-mile of air logistics for both commercial feeder routes and contested military supply missions, with first full-scale flight tests targeted for mid-2026.
David Zagaynov
David Zagaynov is the CEO and co-founder of Poseidon Aerospace, a San Francisco aerospace startup building unmanned, runway-independent cargo aircraft. A UC Berkeley computer science graduate and former Amazon software engineer, he co-founded the company in 2023 with Parker Tenney and Isaac Baumstark around a shared obsession with the ekranoplan, a Soviet Cold War boat-plane that skimmed just above the water. Poseidon is developing the Heron seaplane and the Egret short-takeoff aircraft, each designed to haul up to two tons of cargo over 1,500 miles. The company raised an $11 million seed round in November 2025 led by Tamarack Global, after a $1.4 million pre-seed led by Starship Ventures.