# Staff Software Security Engineer

**Company:** [Anthropic](https://hotfix.jobs/companies/anthropic)
**Location:** London, United Kingdom
**Role:** Security Engineering
**Salary:** £255k – £325k/yr
**Experience:** 8+ years
**Skills:** Python, Go, Rust, C, C++, Infrastructure As Code, GitOps, Kubernetes, Kubernetes Security, Network Security, IAM, Vpc, Mtls, Network Segmentation, Threat Modeling
**Posted:** 2026-09-03

> The Staff Software Security Engineer will secure large-scale AI clusters and multicloud infrastructure through network controls, identity management, secure development workflows, and threat modeling. The role requires 8+ years of software engineering experience, strong systems programming skills, and deep cloud and Kubernetes security expertise.

## Job Description

## Responsibilities
- Build security for large-scale AI clusters across multiple clouds and bare-metal data centers, including IAM, network segmentation, and encryption controls.
- Design and implement network security controls, including default-deny ingress and egress, segmentation across research, training, and production environments, private connectivity across clouds and data centers, cloud firewall policy, and mTLS with service identity.
- Ship security controls as secure defaults using infrastructure as code and GitOps workflows so new clusters, VPCs, and data center links inherit appropriate boundaries.
- Build visibility into network traffic and boundary drift, including detection of exfiltration paths and safe automated remediation.
- Design secure-by-default development workflows and CI/CD pipelines across services, with Kubernetes security, container orchestration, and identity management.
- Threat model and assess risk for complex multicloud and networked environments.
- Partner with infrastructure networking, cluster, and data center teams during design to incorporate security requirements into topology, routing, and firewall decisions.
- Mentor engineers and contribute to Security team hiring and growth.

## Requirements
- 8–15+ years of software engineering experience implementing and maintaining critical systems at scale.
- Strong software engineering skills in Python or a systems language such as Go, Rust, C, or C++.
- Experience operating critical systems at scale using DevOps and cloud automation practices, including infrastructure as code.
- Hands-on network security engineering in cloud or on-premises environments, including VPC design, cloud firewall policy, egress control, private service connectivity, or network segmentation.
- Working knowledge of Kubernetes security and networking, including network policy, service identity, and container hardening.
- Experience with threat modeling and risk assessment for networked and multicloud systems.
- Track record of engineering excellence through high standards, constructive code reviews, and mentorship.
- Clear communication skills and ability to translate technical concepts across organizational levels.
- Experience supporting fast-paced startup engineering teams.
- Bachelor’s degree or equivalent combination of education, training, and experience in a relevant field.

## Nice-to-haves
- Secured Kubernetes networking at scale, including CNI, network policy, service mesh, or mTLS rollouts.
- Experience in high-assurance environments where security controls must be evidenced.
- Experience with interconnects and private connectivity between cloud providers and physical data centers.
- Management-plane and out-of-band network security experience.
- Experience building network traffic visibility or exfiltration detection systems.
- Exposure to large-scale distributed training and its networking requirements.
- Experience leading cross-functional security initiatives.
- Experience managing infrastructure through automated configuration and policy enforcement.
- Experience hardening containerized applications and enforcing security policies.

## Compensation
- Annual salary: £255,000–£325,000 GBP.

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