SAN FRANCISCO—depthfirst, an applied AI lab focused on transforming software security, has announced a $40 million Series A funding round. The investment was led by Accel, with additional 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 flagship product, General Security Intelligence, is an AI-powered platform designed to detect, prioritize, and remediate software vulnerabilities at scale across entire codebases and infrastructure. Unlike traditional security tools that rely on rule-based systems, depthfirst’s platform uses advanced machine learning to understand context, identify root causes, and recommend precise fixes—enabling teams to respond faster and more effectively to emerging threats. The funding will support the expansion of depthfirst’s engineering and research teams, accelerate product development, and scale customer adoption across enterprise and high-growth technology organizations. The company aims to become a foundational layer in modern software development pipelines, helping organizations build more secure systems from the ground up. With cyberattacks growing in frequency and sophistication, depthfirst is addressing a critical gap in the security landscape: the overwhelming volume of vulnerabilities and the lack of intelligent tools to manage them. By applying AI to security workflows, the company seeks to shift from reactive patching to proactive defense. The investment reflects growing confidence in AI-driven security solutions as organizations face increasing pressure to secure complex, rapidly evolving software environments. depthfirst’s approach combines deep technical expertise with real-world engineering insights, positioning it at the forefront of the next generation of cybersecurity innovation.