Staff+ Application Security Engineer - M&A

About the Role

Anthropic's Application Security team secures the systems that build, serve, and increasingly are Claude — and as Anthropic's footprint grows, that mandate now extends to companies and codebases we bring in from outside. This role establishes that function.

You'll own security due diligence and secure integration for Anthropic's acquisitions — assessing a target's security posture pre-close, writing the security risk readout for leadership, and after close, bringing acquired systems up to Anthropic's bar. You'll formalize the playbook, the risk model, and the tooling, and make them repeatable.

Key Responsibilities

• Lead pre-close security due diligence on prospective acquisitions — coordinate external penetration testing, threat-model the target's architecture, assess security controls, and deliver the security risk readout for leadership ahead of close and integration planning
• Drive post-close security integration — stand up static and dynamic analysis coverage on acquired codebases, track high- and critical-severity remediation to closure, fold acquired assets into bug bounty scope, and onboard repositories to Anthropic's automated vulnerability remediation and reporting systems
• Coordinate adjacent security engineering teams (supply chain, cloud, corporate security, detection & response) on their portions of each integration
• Work across a wide set of stakeholders on every deal — corporate development, legal, security leadership, and engineering teams
• Formalize and scale Anthropic's M&A security playbook — risk-scoring model, diligence runbook, integration checklist — and turn as much of it as possible into Claude-powered tooling
• Share the team's operational on-run rotation (bug bounty escalations, launch consults, incident response), swapping out during active deal work
• Contribute to core AppSec projects between deals — secure design reviews, threat modeling for agentic systems, and security automation

Qualifications

Minimum Qualifications

• Hands-on application and infrastructure security experience, including cloud and containerized environments
• Demonstrated ability to rapidly assess an unfamiliar codebase or architecture and produce a clear, prioritized risk assessment for a non-security audience
• Production-quality coding ability in at least one of Python, Go, Rust, or TypeScript
• Practical threat-modeling and vulnerability-identification skills
• Comfort operating with high autonomy, ambiguity, and tightly-held confidential context
• Clear written and verbal communication across varied audiences

Preferred Qualifications

• 7+ years in application security, security consulting, or security architecture
• Prior M&A security due diligence, third-party security assessment, or technical due diligence experience
• Experience standing up or scaling SAST/DAST, bug bounty, or vulnerability management coverage across multiple codebases
• Track record of building security automation or tooling rather than relying solely on manual review
• Familiarity with using LLMs as a core part of your security workflow
• Experience securing agentic, code-execution, or LLM-integrated systems