# Staff+ Application Security Engineer at Anthropic

- Company: Anthropic (anthropic.com)
- Location: Remote-Friendly (Travel-Required) | San Francisco, CA | Seattle, WA | New York City, NY (remote)
- Places: San Francisco, Seattle, New York
- Posted: 2025-01-22
- Apply: https://job-boards.greenhouse.io/anthropic/jobs/4502508008
- Page: https://ye.saranatour.dev/jobs/staff-application-security-engineer-anthropic-kn70rtnzqwsdnzeek05tb3g5xn8hdsbd

## The posting

Staff+ Application Security Engineer
Anthropic · Remote-Friendly (Travel-Required) | San Francisco, CA | Seattle, WA | New York City, NY

## **About Anthropic**

Anthropic’s mission is to create reliable, interpretable, and steerable AI systems. We want AI to be safe and beneficial for our users and for society as a whole. Our team is a quickly growing group of committed researchers, engineers, policy experts, and business leaders working together to build beneficial AI systems.

## About the role:

Anthropic's Application Security team secures the systems that build, serve, and increasingly _are_ Claude. The attack surface is unlike most AppSec work: multi-agent orchestration, sandboxed code execution, agents holding delegated credentials, untrusted tool output crossing trust boundaries — problems with little prior art and no off-the-shelf playbook.

The way the team works is also different. We use Claude as our primary tool across every part of the job: it drives our static analysis, drafts and fixes vulnerabilities as pull requests, performs first-line bug bounty triage, and assists threat modeling for design reviews. The human work is the judgment layer — system-level reasoning, deciding what matters, and building the next thing the model can't do yet.

This is a builder's role on a senior team. We hire engineers who ship production systems _and_ clear a hands-on threat-modeling bar — people who can find the vulnerability but would rather build the system that finds them all. Every engineer owns a system end-to-end, and the team's work has shaped customer-facing product security — including Claude Code's security review tooling, its security guidance plugin, sandboxing, and auto mode.

## Key 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, including the cross-functional relationships that come with it
- 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

## Minimum qualifications:

- 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

## Preferred qualifications:

- 7+ years in application security, security engineering, or security-focused software engineering
- Already use LLMs as a core part of how you