Developer Collaboration for the AI Era: Our Investment in Graphite

It’s a wild time in the world of software engineering. AI code-gen tools are proliferating rapidly, sending output skyrocketing amid warnings of carelessness, security flaws, and a lack of real code understanding. Collaboration is more important than ever before, yet teams remain distributed. Codebases are growing even larger and consolidating into monorepos, and a tumultuous macroeconomic environment provides constant pressure to do more with less.

We believe reimagining code review is key to mitigating many of these issues. Code review is the first collaborative moment in the development lifecycle and the “outer loop” that ensures that code functions effectively. Code review is often the biggest blocker to engineering productivity: every engineer knows the pain of waiting hours (or worse, days) for their code to be reviewed or trying to sift through PRs that are thousands of lines long with no context. Ever since GitHub pioneered the pull request two decades ago, code review has remained painfully the same. We think that’s overdue for a change. 

Today, we are thrilled to announce our investment in Graphite, the company that is building the collaboration layer for human developers and AI agents. Graphite’s magical moment starts from a simple yet mighty paradigm shift: “stacked pull requests” — a new way of organizing code changes pioneered at Meta via an internal tool called Phabricator. If you haven’t heard of stacking, you’re not alone… but ask any engineer in the know, and they will tell you: stacking unblocks review, incentivizes better pull requests, and drives much faster shipping cycles across an entire organization. Once you stack, you’ll never go back. 

As part of today’s news, Graphite is also launching Diamond: an AI code reviewer that adds an additional collaboration partner to every pull request. Diamond delivers instant and high-signal comments in seconds, summarizes changes, and self-heals failing CI, all with deep codebase-specific awareness and customizations. And this is just the beginning. We are excited to see how fast organizations can use a code collaboration platform re-imagined for the AI era.

Over the past year, Graphite has been organically adopted by the highest velocity engineering organizations in the world, including companies like Shopify, Figma, Snowflake, and Perplexity. When speaking to Graphite users across enterprises, we were struck by how frequently adoption begins bottoms-up: individual developers and engineering leaders will champion the platform’s impact, and usage will organically spread to a company-wide rollout. One IC made her team a whole deck to convince them to use Graphite. Another threatened to quit if his team didn’t make the switch. It is rare but powerful to see engineers so passionately evangelize a tool with paradigm shift implications across an entire engineering organization.

All of this would not have been possible without the vision of the exceptional co-founders—Merrill Lutsky, Tomas Reimers, and Greg Foster—who have a long relationship stemming back to their days as Harvard CS students. In a constantly shifting space with many distractions, they bring a relentless focus and long-term vision to the job that reminds us of our most outlier developer tools founders. They are leading a deeply talented in-person team in New York that is hiring across many roles. 

We’re thrilled to be in business with the Graphite team and support their mission to accelerate AI-powered software collaboration for all engineers, everywhere.