Accel Leads depthfirst’s Series A: Securing the World’s Software

Bolstered by AI tools, teams are shipping software faster than ever. Adversaries are keeping pace, using those same tools to probe and exploit vulnerabilities. In a new era of agentic, always-on threats, the old approach to cybersecurity is showing its cracks.

Enter depthfirst, an applied AI lab developing security solutions for businesses facing AI threats. Its autonomous agents understand a company's code, business logic, and infrastructure end-to-end, continuously surfacing vulnerabilities and suggesting concrete fixes. (Picture an elite in-house security team that can work around the clock.)

depthfirst's Early Security Successes

In the three months since launching its product, depthfirst has developed agents that reveal 8x more true-positive vulnerabilities than traditional static analysis tools. It has also reduced false positives by 85%. On CyberGym, a leading benchmark for AI cybersecurity agents, depthfirst achieved roughly a 90% improvement over comparable systems.

During this time, depthfirst has signed at least one new enterprise customer deal per week. Early clients like Lovable, AngelList, Persona, and Moveworks are already seeing results. AngelList's head of security reported that depthfirst felt "like adding an autonomous senior product-security engineer" and credited it with cutting their security engineering load by 70%. Moveworks reported a measurable lift in code quality and review efficiency, citing that it fundamentally changed the way they think about code security.

A Veteran Team of Technical Leaders

depthfirst's founders have spent their careers building and securing complex, large-scale software systems. Qasim Mithani led infrastructure and enterprise platform teams as Head of Infra at Databricks and held senior engineering roles at AWS. Daniele Perito co-founded Faire, was part of the founding team at Cash App, and was a postdoctoral security researcher at UC Berkeley. Andrea Michi was a research engineering lead at Google DeepMind, where he worked on reinforcement learning for Gemini.

By leading depthfirst's Series A, Accel is partnering with a team that has both the technical expertise and conviction to tackle this next generation of security challenges. We share their belief that security shouldn't be an afterthought, but a core part of our infrastructure and an engine of societal resilience. Welcome to the Accel family, depthfirst!