Leo D’Angelo is Chief Technology Officer at Sunstone Partners, where he leads technology and AI diagnostics across the firm’s portfolio. He partners with management teams to evaluate engineering organizations — spanning architecture, security, code quality, testing, and delivery — and to chart practical paths toward AI readiness and agentic-systems adoption. Leo brings more than 40 years of experience in technology, including the previous 12 as a partner with Fortium Partners, where he served as a fractional CTO for multiple sub-$100M ARR companies across a range of industries. He is focused on turning technical due diligence into measurable improvement — reducing risk, accelerating delivery, and building the foundations that let teams adopt AI safely and at scale.