Ali Altaf co-founded Relentless, a New York seed-stage venture firm launched in 2026 by former Index Ventures partner Damir Becirovic and his brother Dino Becirovic. Altaf spent five years at Pinterest, moving from engineering into product management, then co-founded PinAngels, an internal angel syndicate for Pinterest employees and alumni that grew past 200 members. Relentless writes concentrated seed checks up to ten million dollars within about ten days. Its first two disclosed investments are DiligenceSquared, an AI due diligence platform, and Advocacy, an AI litigation platform.