Jellyfish is a Boston-based Engineering Management Platform that turns the signals from engineering tools - Git, Jira, CI/CD, and now AI coding assistants - into business-readable insight. It helps engineering leaders see where their teams spend time, tie that work to company strategy, automate R&D cost capitalization, and measure the real ROI of tools like GitHub Copilot. Founded by veterans of Endeca, Jellyfish has raised roughly $117M and serves hundreds of enterprises including Mastercard, Priceline, and PagerDuty.
Eric Bailey is a Boston-based accessibility advocate, designer, writer, developer, and speaker. As a staff designer on GitHub's Primer design system, he works to make component libraries genuinely usable for people relying on assistive technologies. He is the longtime lead redesigner and maintainer of The A11Y Project, has published more than 200 articles across publications like CSS-Tricks, Smashing Magazine, and the GitHub Blog, and is a fixture on the conference circuit. His guiding line: if it's inaccessible, it is neither radical nor revolutionary.
CodeRabbit is an AI-powered code review platform that reads every pull request, leaves line-by-line feedback, and helps engineering teams keep up with code now being written largely by other AIs. Founded in 2023 and headquartered in San Francisco, it serves more than 10,000 organizations including Chegg, Groupon, and Mercury.
Jason Warner is the co-founder and CEO of Poolside, a San Francisco-based frontier AI lab building proprietary foundation models for software development with $626M raised and a $3B+ valuation. Before Poolside, he was CTO of GitHub - where he launched Actions, Packages, Codespaces, and incubated what became GitHub Copilot - and then a Managing Director at Redpoint Ventures. A self-described 'average developer but excellent architect,' Warner is betting that reinforcement learning from code execution will make software the first domain where AI surpasses human-level intelligence.
Bito is a San Francisco-based AI developer tools company building agents that review pull requests and ground code generation in deep codebase context. Its AI Code Review agent plugs into GitHub, GitLab, and Bitbucket to flag bugs, security issues, and style problems before humans burn a single brain cell on them - and it speeds up PR merges by 89%, according to the company.
Joshua Levy is the Co-Founder and CEO of Holloway, a San Francisco-based digital publishing platform that produces comprehensive expert-reviewed guides on professional and entrepreneurial topics. A mathematician-turned-engineer, Levy previously served as a founding engineer at BloomReach and held infrastructure roles at Viv Labs (acquired by Samsung) and SRI International where he worked alongside the original Siri team. He is perhaps best known in technical circles as the creator of 'The Art of Command Line' on GitHub - a guide with over 150,000 stars translated into 14 languages and read by more than 2 million people. At Holloway, he has pioneered a new model of expert-driven digital publishing, raising $4.6M in seed funding from NEA, the New York Times Company, and South Park Commons, and co-authoring guides on equity compensation and technical recruiting that have collectively reached millions of readers.
Kakul Srivastava is the CEO of Splice, the cloud-based music creation platform powering millions of producers worldwide with sample libraries, plugins, and AI-powered tools. A mechanical engineer turned product visionary, she grew Flickr from 37,000 to 60 million users, led product at GitHub and Adobe's Creative Cloud, and co-founded the enterprise app studio Tomfoolery. Named to TIME's 100 Most Influential People in AI in 2025 and Billboard's Women in Music Executives list three years running, she champions a philosophy that technology should empower artists — not replace them.
Grey Baker is a Cambridge-educated mathematician turned software entrepreneur best known for bootstrapping Dependabot to $14k MRR before selling it to GitHub in 2019, then growing GitHub Advanced Security to $140M ARR. A former McKinsey consultant who taught himself to code in six months, cycled 30,000km around the world between startups, and co-founded YC S23 company Pincites (AI contract negotiation, acquired by Filevine in 2025), he now serves as a Visiting Partner at Y Combinator.
Stephanie Zinn is Editorial Partner at Andreessen Horowitz (a16z), where she leads editorial strategy and audience growth across Substack, X, YouTube, and search. With over a decade in tech editorial, she previously built editorial teams from scratch at Coinbase and GitHub - generating 15M newsletter subscribers at Coinbase and launching GitHub's influential ReadME Project. She is one of the rare operators who treats clear writing not as a nice-to-have but as a core business asset.
Tom Preston-Werner co-founded GitHub in 2008 and turned it into the world's largest developer platform before Microsoft acquired it for $7.5 billion. Beyond GitHub, he created Gravatar, Jekyll, TOML, and the Semantic Versioning spec — tools used by tens of millions of developers daily. He dropped out of Harvey Mudd College, declined a $300,000 Microsoft bonus to bet on GitHub, angel-invested in over 175 startups including early checks in Stripe and Cursor, and in 2025 launched Preston-Werner Ventures (PWV) targeting a $100M fund. He and his wife signed The Giving Pledge in 2023.
Peter Levine is an advisor at Andreessen Horowitz, where he focuses on enterprise investing with a track record of backing transformative developer tools and infrastructure companies. An engineer turned executive turned investor, he scaled Veritas Software to $1.5 billion in revenue as EVP, sold XenSource to Citrix for $500 million as CEO, and led a16z's investments in GitHub (acquired by Microsoft for $7.5B), Figma (IPO 2025), and DigitalOcean (IPO 2021). He brings an unusual combination of deep technical expertise and business acumen, teaching management at Stanford GSB while serving on the boards of Apollo GraphQL, PlanetScale, Shield AI, Mixpanel, and Udacity.
Nat Friedman is a serial founder, investor, and tech executive best known for co-founding Xamarin and serving as CEO of GitHub, where he launched Copilot. After leaving GitHub in 2021, he co-founded NFDG, a $1.1B AI venture fund with Daniel Gross, launched the Vesuvius Challenge to decode ancient scrolls using machine learning, and joined Meta's Superintelligence Labs as VP of Product and Applied Research in 2025.
Cassidy Williams is a Chicago-based software engineer, Senior Director of Developer Advocacy at GitHub, and one of the most recognizable voices in the frontend developer community. Known online as @cassidoo, she runs the widely-read weekly newsletter 'rendezvous with cassidoo,' builds mechanical keyboards, mentors early-career engineers, and has spoken everywhere from TED stages to the United Nations. She's a Glamour '35 Women Under 35 Changing the Tech Industry' honoree, a LinkedIn Top Professional, and a firm believer that you get a lot by giving.
Weave is a YC-backed engineering intelligence platform that uses LLMs to analyze pull requests and measure real engineering output. It helps teams distinguish between human and AI-generated code, introducing the 'Weave Hour' as a metric for actual work completed.