Security Engineer, AI Infrastructure

The role

You will secure the platform layer including cloud infrastructure, Kubernetes, identity, networking, and AI systems. You will build security foundations, harden infrastructure, and implement Zero Trust principles.

What you will do

• Build security foundations for the AI platform including identity, isolation, secrets management, and access control.
• Harden infrastructure from cloud networking and service meshes to CI/CD pipelines and data and model pipelines.
• Implement Zero Trust principles and machine identity across workloads.
• Protect customer data and agent workloads by designing secure execution environments and data access pathways.
• Build security guardrails into infrastructure and deployment workflows using Infrastructure-as-Code.
• Own threat modeling across infrastructure layers.
• Own security for forward-deployed infrastructure including bespoke VPCs and customer-environment deployments.
• Partner with platform, infra, product, and ML teams to ship code and infrastructure.

Required qualifications

• 5+ years of experience in security engineering, infrastructure, or SRE with hands-on experience building or securing production systems at scale.
• Fluent in cloud security fundamentals (IAM, networking, KMS, secrets, isolation) across AWS, GCP, or Azure.
• Designed and implemented secure systems end-to-end.
• Hands-on experience with Kubernetes, container security, and Linux systems.
• Ability to think in terms of threat models, trust boundaries, and failure modes.
• Experience building guardrails using Infrastructure-as-Code.
• Experience with authentication and authorization systems, secrets management, and cryptography basics.
• Hands-on builder energized by writing code, shipping infrastructure, and partnering with engineers.
• Ability to thrive in ambiguous, high-agency environments.

Nice to have

• Terraform preferred
• Experience with ML systems or multi-tenant platform isolation
• Familiarity with service mesh and zero-trust architectures
• Proficiency in Go, Python, or a similar language for automation and tooling

Benefits

• Competitive salary plus equity
• Daily lunches
• Commuter benefits
• 401(k)
• Medical, Dental, and Vision
• Unlimited PTO

About the company

Brain Co. builds AI-native operating systems for large, regulated institutions. Their proprietary platform is called Atlas.