Senior AI AppSec Engineer — Build Secure LLM Systems

Anthropic; United States; Hybrid; USD 320,000 - 485,000; Full time

Job summary

Anthropic is hiring for an Applications Security Engineer on a senior team to design, build, and operate Claude-powered security systems and end-to-end security ownership across production services.

You’ll lead secure design reviews, drive threat modeling for novel AI systems, and evolve a scalable bug bounty program with automation while partnering with Product, Infra, and Research. Strong coding in Python/Go/TypeScript is expected.

Qualifications

• 7+ years in application security, security engineering, or security-focused software engineering.
• Already use LLMs as a core part of how you work, with opinions about where they help and where they don't.
• Experience securing agentic, code-execution, or LLM-integrated systems specifically.
• Prior ownership of a bug bounty program, vulnerability disclosure program, or vulnerability-management infrastructure at scale.
• Background building security automation or developer-facing security tooling.
• Offensive security or penetration testing experience.

Responsibilities

• Design, build, and operate Claude-powered security systems — LLM-driven code analysis, automated vulnerability remediation, AI-assisted threat modeling — and own one or more of them end-to-end.
• Lead secure design reviews and threat modeling for novel AI systems, identifying risks that don't map to existing frameworks.
• Evolve a public bug bounty program where automation handles routine triage and root-cause work, and engineers handle escalations and corner cases.
• Partner with Product, Infrastructure, and Research teams as an embedded security owner — consulting on launches, shaping architecture, and influencing decisions where security is the constraint.
• Share an operational on-run rotation with the rest of the team — bounty escalations, incident response, and launch consults on systems serving Claude in production.
• Hands-on application and infrastructure security experience, including cloud and containerized environments.
• Production-quality coding ability in at least one of Python, Go, Rust, or TypeScript, with a track record of building durable systems rather than one-off scripts.
• Practical threat-modeling and vulnerability-identification skills — you've found and reasoned about real bugs in real systems, even if breaking isn't your primary mode.
• Demonstrated ability to operate with high autonomy and ambiguity — comfortable being handed a problem and a lot of latitude rather than a spec
• Clear technical communication with both engineers and leadership

Skills

Threat modeling

LLM tooling

Code analysis

Cloud security

Python

Go

Rust

TypeScript

Education

Bachelor's degree

Job description

Anthropic is hiring for an Applications Security Engineer on a senior team to design, build, and operate Claude-powered security systems and end-to-end security ownership across production services.

You’ll lead secure design reviews, drive threat modeling for novel AI systems, and evolve a scalable bug bounty program with automation while partnering with Product, Infra, and Research. Strong coding in Python/Go/TypeScript is expected.