Jason Warner (@jasoncwarner) — Twitter Score 134 out of 1000

Jason Warner is an AI founder and angel investor who co-founded Poolside, an artificial intelligence company building foundation models for agentic software development. Jason Warner's Twitter Score is 134 out of 1000 (an Excellent rating) as of October 2026, ranking #4,537 (top 1%) among 493,607 tracked accounts.

Jason Warner co-founded Poolside and serves as its co-CEO, leading the company's work on AI models purpose-built for software engineering workflows. Poolside announced a $500 million fundraise in October 2024 to scale its training infrastructure to 10,000 GPUs. Beyond Poolside, Jason Warner serves as a Director at Atlassian and sits on the Operating Board of Directors at Bridgewater Associates.

Jason Warner previously served as Chief Technology Officer at GitHub, where he oversaw platform strategy and helped bring products including Actions, Packages, Advanced Security, Connect, and Codespaces to market. Before that, he was Vice President of Engineering at Heroku and formerly worked at Canonical. Between those engineering leadership roles and founding Poolside, Jason Warner was Managing Director at Redpoint Ventures from 2021 to 2023, where he invested across open-source technology, developer tools, infrastructure, fintech, and crypto, including co-authoring the firm's Series C announcement for Web3 infrastructure company Alchemy in October 2021.

As an angel investor, Jason Warner has backed Magic Labs, XMTP and Puma AI. Jason Warner's account has accumulated 39,999 followers as of October 2026 and 1,021 posts since joining in 2016. Jason Warner has been mentioned by 80 accounts a total of 160 times.

Who follows Jason Warner on X?

The accounts that follow Jason Warner include 650 founders, 207 angel investors, 66 influencers and 26 VCs. Among them are Marc Andreessen, Nikita Bier, jesse.base.eth, Laura Shin, Threadguy and Anthony Pompliano.