Depthfirst, an applied AI lab dedicated to shaping the future of software security, announced that it has closed a $40 million Series A funding round. Accel led the round, with participation from Alt Capital, BoxGroup, Liquid 2 Ventures, Mantis VC, SV Angel, and prominent angel investors including Jeff Dean, Kirsten Green, Colin Evans, Logan Kilpatrick, and Julian Schrittwieser. The company’s innovative AI platform, General Security Intelligence, is designed to detect, triage, and remediate vulnerabilities across every layer of software and infrastructure.
As AI-powered coding tools flood the software ecosystem, security vulnerabilities are growing at an unprecedented pace. Businesses now face threats that extend beyond traditional human-scale exploits to automated, autonomous, and constantly active adversaries. Depthfirst builds General Security Intelligence with agents capable of understanding company systems end-to-end, responding with the speed and intelligence of AI-empowered attackers. By fortifying the global software stack, the company enables not only resilient businesses but also safe and controllable AI adoption.
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“We’ve entered an era where software is written faster than it can be secured,” said Qasim Mithani, co-founder and CEO of depthfirst. “AI has already changed how attackers work. Defense has to evolve just as fundamentally.”
Since its product launch four months ago, depthfirst has deployed agents that uncover eight times more true-positive vulnerabilities than traditional static analysis tools while reducing false positives by 85%. The platform also achieved state-of-the-art results on CyberGym, a leading cybersecurity evaluation framework, delivering a 90% performance improvement over prior benchmarks. Following general availability, the company has signed industry leaders including Lovable, Supabase, Moveworks, and AngelList as customers.
“depthfirst felt like adding an autonomous senior product-security engineer to our team at AngelList,” said Alberto Martinez, Head of Security at AngelList. “It quickly surfaced our top issues and got smarter over time by tracking context across scans, eliminating false positives, and opening ready-to-merge fixes our developers immediately understand. It’s doubled the efficiency of our security-engineering team.”
Traditional security tools focus on yesterday’s threats, but they are insufficient in the AI era, where offensive techniques outpace defenses. In contrast, depthfirst’s platform adopts an AI-first defense approach, going beyond surface scans to fully comprehend code, context, and threat models catching vulnerabilities before attackers can exploit them.
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“depthfirst has fundamentally changed how we think about code security and quality at Moveworks,” said Damian Hasse, CISO at Moveworks. “They not only find code defects and complex threats like backdoors and malware, but also proactively offer fixes. The result is stronger security and a measurable lift in code quality and review efficiency across the board.”
Founded in 2024, depthfirst aims to secure the world’s software, acknowledging that vulnerabilities threaten the integrity, security, and resilience of modern digital infrastructure. The founding team draws on technical expertise from Google DeepMind, Databricks, and Faire, combining deep AI knowledge with security research to tackle the toughest challenges with AI-native architecture. The Series A funds will accelerate research and development, GTM initiatives, and hiring in applied research, engineering, product, and sales.
“Software security is plagued by claims of ‘better signal to noise’ and legacy tools that are generally ill-equipped to meet the heightened risks of modern day threats,” said Sara Ittelson, Partner at Accel. “depthfirst has the industry background and team best poised to transform this $400B corner of the enterprise market, and just in time as AI and agentic tools become widely adopted.”
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