Security Engineer

engineering San Francisco, CA | Hybrid full-time

We are seeking a highly skilled Security Engineer to join our Series A team as we scale from early product traction to broader customer adoption. You will play a foundational role in owning security engineering at Schemata — the architecture, controls, tooling and compliance posture that let a small startup handle sensitive customer and government data credibly.

At Schemata, we build spatial AI-powered products for blue collar and mission critical work. We combine state-of-the-art applied research in LLMs and spatial reasoning to power AI-enabled workflows used in regulated industries with high standards of accuracy and compliance.

This is a high‑impact, cross‑functional role: security here is both a product requirement and a sales requirement. You will build the technical controls that protect customer data and the evidence base that gets us through federal authorization, vendor security reviews and customer audits.

• Own the security architecture: define and implement how identity, authorization, tenancy isolation, encryption and audit logging work across our platform, and review designs before they become expensive to change
• Red team our AI systems: probe the LLM and spatial reasoning surfaces the way an adversary would — prompt injection, jailbreaks, tool-use and agent abuse, retrieval and training data poisoning, model extraction, and the failure modes specific to grounding models in customer documents and 3D scenes..
• Keep the attack surface clean: own the security pipeline (SAST/DAST, dependency and container scanning, secrets detection, IaC policy checks) and the vulnerability management that follows from it: an accurate picture of what we run, what's actually exploitable, and remediation driven to closure on real timelines.
• Run detection and response: own the security monitoring pipeline day to day. Triage, investigation, containment and post‑incident review. Be the person who gets paged, and make each incident produce a durable change: a new detection, a closed gap, a corrected runbook.
• Carry the compliance load: implement and evidence NIST SP 800‑53 and SOC 2 controls, support FedRAMP and ATO efforts, and manage POA&M tracking and remediation.
• 4+ years in security engineering, application security or cloud security with hands‑on implementation ownership, not purely policy or GRC.
• Deep AWS security expertise: IAM design, VPC and network controls, KMS, Guard Duty/Security Hub, and least‑privilege at scale.
• Strong applied knowledge of application security — authN/authZ design, common vulnerability classes, secure code review, threat modeling.
• Ability to write real code (Python) to automate controls, evidence collection and tooling.
• Working knowledge of at least one major compliance framework — NIST 800‑53/RMF, FedRAMP, SOC 2, or ISO 27001 — and the practical work of evidencing controls.
• Container and Kubernetes security experience: image hardening, runtime policy, supply chain integrity.
• Enough backend or infrastructure ability to be a genuine extra pair of hands outside security: shipping a service, writing a Terraform module, fixing a CI pipeline.
• Clear communication with non‑security engineers and with customer security teams alike.

• Federal authorization experience — running or supporting an ATO, working with AOs and ISSOs, FISMA continuous monitoring.
• Certifications such as CISSP, OSCP, CCSP, CAP, or GIAC equivalents.
• Experience securing ML/AI systems — model supply chain, data governance, prompt injection and inference abuse.
• Familiarity with DISA STIGs, NIST 800‑171, CMMC or CUI handling requirements.
• Experience being the first security hire at a startup and building the function from zero.
• Defense, aerospace, energy or other regulated‑industry experience; active or ability to obtain U.S. security clearance.

• Own & shape the spatial‑intelligence function at the frontier of multimodal AI and 3D simulation.
• Tackle cutting‑edge problems combining 3D perception, graphics and neural rendering to save lives and billions of dollars.
• Work with world‑class researchers and engineers in a fast‑paced, high‑ownership environment where your innovations ship directly to mission‑critical users.
• Competitive upside, meaningful equity, top‑tier benefits and whatever gear you need to excel, with an in‑person culture in San Francisco and flexibility for extraordinary talent.

Experience the future of spatial intelligence