AI Infrastructure Security Engineer

About the Role:

As our Security Engineer, Infrastructure, you'll secure the platform layer end-to-end including cloud infrastructure, Kubernetes, identity, networking, and the systems that AI runs on. This is a hands-on builder role. You'll write code, ship infrastructure, and work shoulder-to-shoulder with our infra team as a true engineering partner, not a reviewer.

It's a high-ownership role for someone who wants to build secure-by-default infrastructure from first principles, and grow the function as the company scales. You'll also be thinking a step ahead about security in an AI-native environment, where agents write code and operate inside developer and production workflows, while staying grounded in the core work of cloud, Kubernetes, identity, and networking.

What You’ll Work On:

• Build the security foundations of our AI platform: identity, isolation, secrets management, and access control across cloud and Kubernetes environments.
• Harden infrastructure end-to-end from cloud networking and service meshes to CI/CD pipelines and the data and model pipelines powering Brain Co's AI capabilities work.
• Implement Zero Trust principles and machine identity across workloads; short-lived credentials, least-privilege access, and encrypted service communication.
• Protect customer data and the agent workloads running on our platform. Design secure execution environments and data access pathways for code and actions taken by agents on our systems.
• Build security guardrails directly into infrastructure and deployment workflows using Infrastructure-as-Code (Terraform) so security scales with the platform.
• Own threat modeling across infrastructure layers—identifying and remediating risks before they become incidents.
• Own security for Brain Co's forward-deployed infrastructure — designing and hardening bespoke VPCs and customer-environment deployments where every engagement brings its own unique attack surface.
• Partner with platform, infra, product, and ML teams to ship code and infrastructure together as a true partner so engineers move fast with secure-by-default systems.

You Might Be a Great Fit If You:

• Have 5+ years of experience in security engineering, infrastructure, or SRE with hands-on experience building or securing production systems at scale.
• Are fluent in cloud security fundamentals (IAM, networking, KMS, secrets, isolation) across AWS, GCP, or Azure.
• Have designed and implemented secure systems end-to-end not just reviewed them after the fact.
• Have hands-on experience with Kubernetes, container security, and Linux systems.
• Think in terms of threat models, trust boundaries, and failure modes and can translate that into concrete controls.
• Enjoy building paved roads and guardrails using Infrastructure-as-Code (Terraform preferred) so the whole team moves faster safely.
• Have experience with authentication and authorization systems, secrets management, and cryptography basics.
• Are a hands-on builder who is energized by writing code, shipping infrastructure, and partnering directly with infra and platform engineers rather than advising from the sidelines.
• Thrive in ambiguous, high-agency environments and want ownership of the infrastructure security function as it grows.

Bonus Points For:

• 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.

Why Join Us:

• Secure an AI platform operating at the frontier; deployed in governments, hospitals, and critical industries worldwide.
• Work on infrastructure security where the attack surface is still being defined — protecting systems built to push AI capabilities forward.
• Work alongside senior engineers from Tesla, DeepMind, Databricks, and other top engineering orgs.
• Shape how infrastructure security is done from the ground up with real ownership and scope to grow.
• Ship fast, learn constantly, and see your work protect production systems used by millions.
• Earn competitive compensation and meaningful equity in a high-growth company.

Benefits

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