Sebastian Barriga is the founder and managing partner of Milemark Capital (also Milemark Diffraqtion SPV LLC). See contact routes.
Sebastian Barriga is the founder and managing partner of Milemark Capital (also Milemark Diffraqtion SPV LLC), a Boston-based venture firm where he leverages nine years of private equity experience from Carlyle South America’s $358M Fund and prior investment banking roles at Citigroup. His investment thesis targets early-stage startups, specifically pre-seed and seed rounds, that deploy deep, proprietary AI models rooted in scientific research and are led by diverse teams from MIT and Harvard. Barriga typically invests in pre-seed and seed stages with a focus on the AI sector and the Cambridge/Boston geography, often acting as an angel investor or board member rather than a traditional lead. Notable portfolio companies include Diffraqtion, where he participated in a $4.2M pre-seed round in January 2026, as well as Praava Health, Piction Health, Empallo, and Central Casting AI. He distinguishes his approach by prioritizing teams building scalable businesses defended by proprietary AI systems, data, and models, a view he has articulated in public interviews regarding early-stage investing. Additionally, Barriga serves as an MIT Assistant Lecturer
This profile is part of the StartupFundraising investor database: focus, portfolio history, disclosed location and contact routes, refreshed as new filings and rounds are ingested. Founders use it to check fit before reaching out and to find investors in Cambridge.
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