Steven Sinofsky (@stevesi) — Twitter Score 251 out of 1000

Steven Sinofsky is a technology investor and writer who serves as a board partner at Andreessen Horowitz, with affiliations extending to a16z crypto. Steven Sinofsky's Twitter Score is 251 out of 1000 (an Excellent rating) as of September 2026, ranking #1,517 (top 0.5%) among 486,860 tracked accounts.

Steven Sinofsky previously worked at Microsoft as president of the Windows Division, where he was responsible for engineering and marketing functions across Windows, Windows Live, and Internet Explorer. He joined Andreessen Horowitz as a board partner following his departure from Microsoft, representing the firm on portfolio-company boards rather than serving as a full-time partner.

Steven Sinofsky maintains an active writing practice through his Substack, Hardcore Software by Steven Sinofsky, where he has continued publishing into 2026. His seed investing activity and board partner role at Andreessen Horowitz give him indirect exposure to crypto and blockchain through the firm's affiliation with a16z crypto. Steven Sinofsky has accumulated 211,361 followers as of September 2026 and has published 1,687 posts on the platform. He has been mentioned by 443 accounts, with 1,346 total mentions.

Who follows Steven Sinofsky on X?

The accounts that follow Steven Sinofsky include 1,109 founders, 348 angel investors, 137 influencers and 41 VCs, among them Balaji, Brian Armstrong, Chris Dixon, Marc Andreessen, Nikita Bier and Sam Altman.