depthfirst, an applied AI lab shaping the future of software security, announced its $40M Series A round, led by Accel with participation from Alt Capital, BoxGroup, Liquid 2 Ventures, Mantis VC, SV Angel, and notable angel investors including Jeff Dean, Kirsten Green, Colin Evans, Logan Kilpatrick, and Julian Schrittwieser. depthfirst's novel AI platform, General Security Intelligence, is designed to detect, triage, and remediate vulnerabilities across every layer of software and infrastructure.