Lead Security Engineer

About the role

Alembic is the pioneering Causal AI platform. We help the world's largest enterprises move past correlation to prove what actually drives business outcomes - the question marketing and growth teams have never been able to answer with confidence. Fortune 100 companies including Nvidia, Delta Air Lines, and Mars use Alembic to make multimillion-dollar decisions on trusted, causal evidence. We're backed by a $145M Series B from WndrCo (founded by Jeffrey Katzenberg), Jensen Huang, Joe Montana, Prysm Capital, and Accenture. Our models run on our own NVIDIA DGX SuperPOD built on Grace Blackwell infrastructure - one of the fastest private supercomputers in the world. (We've melted GPUs getting here.) We're looking for a lead-level Security Engineer and Architect to own system, network, and host security end-to-end for a rapidly growing on-prem, Kubernetes-based AI factory. This is a hands-on, high-impact role reporting directly to our CTO/CISO and working side-by-side with Technical Operations, Corp IT, Platform Engineering, and our scientific teams. It's not a compliance seat that exists to satisfy published controls - it's the chance to shape our security posture from the ground up, secure high-value client data, and build the team and tooling to do it. Two things make this role distinctive. First, Alembic is "Default to Open" by design: security here must respect that maximum information sharing is basic to how we operate, while still protecting customer data and the IP - patents and trade secrets - our applied-science work generates. Balancing those is the core intellectual challenge of the job. Second, we're an AI-first company that uses many kinds of AI across everything we do; deciding which AIs operate in which containers is one of the more interesting problems you'll own.

Responsibilities

• Design and implement security controls across all environments - network segmentation and firewalling, IDS/IPS, and traffic analysis on our on-prem Kubernetes platform.
• Build and enforce host security: EDR, kernel telemetry, hardening, and baseline implementation across the fleet.
• Own identity and access - AuthN/AuthZ, RBAC, and service identity - grounded in OIDC, SAML, and mTLS.
• Stand up incident-detection pipelines (SIEM, metrics, endpoint telemetry) tuned to surface high-signal threats over noise, and lead incident response end to end: triage, containment, recovery, root-cause analysis, and forensics.
• Keep the focus on enablement over restriction - effective security, not compliance for its own sake - while balancing IP protection, customer-data protection, and broad internal information sharing.
• Partner with Legal and the CISO to obtain the compliance certifications we need and to answer customer questions about the security of our systems; hire and mentor as the security function grows.
• What Will Help You Succeed
• 8+ years in security engineering, infrastructure, or related roles.
• Strong Linux system security and networking (SSH certificates, directory-based authentication) and strong Kubernetes security (RBAC, tenant isolation, admission control).
• Real experience securing on-prem environments, not only public cloud.
• A proven track record leading real-world incidents, with familiarity with attacker techniques (lateral movement, persistence, exfiltration) and hands-on depth in EDR, IDS/IPS, and SIEM.
• Strong command of OIDC, SAML, mTLS, and cryptography-based storage security.
• Comfort writing code, automation, and tooling in Python or similar, plus configuration management via IaC (Terraform, Ansible).
• The judgment to distinguish high-signal threats from noise, make pragmatic tradeoffs in a fast-moving company, and communicate effectively with technical stakeholders.
• The role is right for you if:
• You want to shape a security posture from first principles rather than administer someone else's control framework - and you see "Default to Open" as a design constraint worth solving, not a threat to route around.
• You'd rather be in the terminal doing root-cause analysis and building detection pipelines than managing them from a slide deck, and you want to build the team around you as scope grows.
• Why You Might Be Excited About Alembic
• Hard problems with real impact: You'll secure a one-of-a-kind on-prem AI factory and protect the high-value data behind multimillion-dollar decisions at Fortune 100 companies.
• Technical autonomy: Direct access to the CTO/CISO and decision-makers, ownership over the security architecture, and the freedom to solve problems your way.
• Cutting-edge environment: Secure

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