Top Security Engineer Jobs in San Francisco, CA

Build and scale backend security platform services, including authentication, authorization, identity infrastructure, permission systems, and data models. Lead cross-team technical initiatives, standardize security solutions, collaborate with compliance and mission stakeholders, and influence architecture and engineering standards. The role requires strong system design, backend development, security expertise, technical leadership, and the ability to operate in sensitive environments.

Design, implement, and improve security controls for operational technology (OT) networks in datacenter environments. Identify and remediate risks, create inventories and risk registers, coordinate penetration testing and vulnerability mitigation, embed security into OT systems, develop recovery and response playbooks, and present technical findings to stakeholders while partnering with engineering and third parties to reduce risk.

This role involves owning the security architecture for AI platforms on GCP, designing guardrails, and integrating security into CI/CD pipelines. Candidates should have extensive experience in cloud security, specifically with GCP services, Kubernetes security, and AI/ML security practices.

Lead end-to-end red team and adversary emulation operations across cloud, identity, network, endpoint, hardware, and operational security environments. Develop offensive tooling, implants, and AI-driven autonomous agents for reconnaissance, exploitation, and post-exploitation. Serve as a technical lead for customer engagements, brief security executives, collaborate with blue teams and threat intelligence organizations, establish operational standards, and mentor senior operators.

Lead product security architecture and offensive testing, including threat modeling, architecture reviews, penetration testing across web applications, APIs, mobile clients, and cloud infrastructure, secure design definition, code reviews, and remediation validation. Partner with engineering teams on authentication, authorization, data protection, trust boundaries, and cloud-native security while communicating risks and leading cross-functional security initiatives.

Perform offensive security research and engineering for Windows: discover vulnerabilities, develop PoC mitigations and tools (fuzzers/agents), conduct code and design reviews, partner with product teams, and engage external researchers to improve OS security.

Lead Prelim’s security program across secure SDLC, application and cloud security, IAM, incident response, endpoint management, vendor risk, security reviews, and SOC 2 Type II compliance. Partner with DevOps and engineering, coordinate penetration testing, develop policies and risk roadmaps, manage audits and customer questionnaires, and improve detection and access controls. The role is the company’s first dedicated security hire and requires strong judgment, communication, and hands-on technical skills.

Secure Windows products and devices through offensive security research, code and design reviews, penetration testing, vulnerability discovery, fuzzing, and mitigation development. Build reusable security review tools, identify vulnerabilities in operating system features and native applications, collaborate with Windows engineering teams on durable defenses, engage security researchers, and communicate the business value of security investments.

Lead end-to-end red team and adversary emulation operations across cloud, identity, network, endpoint, hardware, and operational environments. Develop offensive tooling, implants, and tradecraft; direct AI-driven autonomous agents; discover and exploit vulnerabilities; brief executive customers; provide defensive guidance; collaborate with threat intelligence and blue teams; establish operational standards; and mentor security operators.

Build and operate automated security infrastructure across AWS and Kubernetes, including cryptographic-material lifecycles, security telemetry, compliance automation, policy-as-code, threat modeling, and CI/CD security controls. Develop agentic AI workflows using tools such as Claude Code and MCP integrations. Support incident response, review security architecture, automate evidence collection, and partner with engineering, audit, risk, vendors, and clients to improve security posture at scale.

Build, integrate, and operate cloud-native security controls across infrastructure, data platforms, applications, CI/CD pipelines, and enterprise services. Develop CSPM and DLP capabilities, detection logic, automation, and incident-response mechanisms. Integrate controls with SIEM platforms, apply infrastructure-as-code and automated testing practices, and support reliable production operations. Collaborate with platform, application, and product teams to improve cloud security effectiveness and developer adoption.

Lead and develop the Security team while owning the company-wide security and compliance program. Responsibilities include managing SOC 2, PCI DSS, GDPR/CCPA, audits, policies, vendor risk, security awareness, and customer security communications. The role also provides technical direction for security tooling, cloud security, identity and access management, application security, vulnerability management, architecture reviews, and threat modeling.

Lead product security initiatives for cloud, AI, and enterprise platforms. Responsibilities include threat modeling, security architecture reviews, identifying systemic weaknesses, developing secure-by-design guidance and reference architectures, advising engineering and product leaders, leveraging AI and automation for scalable security assessments, investigating emerging attack paths, mentoring teams, and improving security review methodologies and tooling.

Secure CrowdStrike’s software supply chain and code-hosting environments by assessing GitHub organizations, open-source integrations, repositories, dependencies, and third-party packages. Implement repository guardrails, secret scanning, access controls, and automation; investigate supply-chain threats such as typosquatting and dependency confusion; promote secure coding and open-source compliance; and collaborate with engineering teams on security initiatives.

Build and maintain custom security tools, middleware, automation, APIs, integrations, dashboards, and security workflows. Integrate identity, endpoint, SIEM, SaaS, and other security platforms using APIs, cloud services, containers, and CI/CD. Translate security policies into secure, code-driven solutions while supporting SOAR, continuous monitoring, compliance, and cross-functional collaboration.

Security Engineer responsible for application security, vulnerability and threat management, cloud and Kubernetes security, DevSecOps tooling, incident response, forensic analysis, and secure system architecture. The role integrates security testing into CI/CD pipelines, automates security tasks, supports IAM and cryptographic key management, and collaborates with engineering teams to strengthen security processes and tooling.

Detect, investigate, and prevent threats across corporate IT by performing incident response, digital forensics, threat hunting, designing security controls and alerts, and deploying and operating security tooling across identity, endpoints, networks and cloud.

Design, build, and operationalise product and infrastructure security controls; develop detection and incident response workflows; leverage endpoint, network, and cloud telemetry for threat hunting; conduct forensic analysis and remediation; embed security across engineering teams and improve resilience and secure scale of services.

Lead and execute Grow Therapy's multi-year Security Engineering roadmap. Build secure-by-default infrastructure (auth, authZ, logging, egress), drive data security and systematic data tagging, develop org-wide security scorecards, enable automated least-privilege and vulnerability management, and influence AI-native security and security culture across product, platform, and compliance teams.

Build and lead WRITER’s application security program for enterprise AI systems. Responsibilities include threat modeling, secure architecture reviews, SAST/DAST integration, security code reviews, secure coding standards, penetration testing, vulnerability remediation, and designing controls for AI agents, data pipelines, and model-training environments. The role partners closely with engineering teams, automates security processes, researches emerging LLM threats, and enables secure product development at scale.

Own corporate IT operations and security: onboarding/offboarding, device and endpoint management, identity and access, networking, SaaS administration, vulnerability management, incident response, and GRC/compliance programs while scaling processes and tooling.

Lead assessment and mitigation of security risks in the virtualization stack. Build threat models, rubrics, and defenses; partner with kernel, virtualization, and provisioning teams to design and implement mitigations; mentor engineers, manage vulnerability backlog, and promote security best practices across product teams.

Design, implement, and maintain scalable cloud security controls for Vercel's platform. Harden infrastructure using infrastructure-as-code and policy enforcement, secure CI/CD pipelines, perform threat modeling and risk analysis, improve monitoring and incident response, and build platform-level security tooling in collaboration with platform and infrastructure teams.

Oversee the security of firm applications, networks, systems, hardware, and mobile devices throughout their lifecycles. Develop security requirements and architecture, manage controls and configurations, perform certification and accreditation, maintain asset inventories, and ensure secure development and acquisition practices. Collaborate across departments and mentor team members while serving as a primary technical security contact. The role requires independent judgment, strong analytical ability, knowledge of security frameworks and technologies, and at least seven years of related experience.

Provides security engineering and compliance expertise for FedRAMP Cloud Service Providers. Reviews cloud architectures, authorization packages, security controls, system security plans, assessment reports, vulnerability scans, and penetration tests. Leads architecture interviews, identifies technical and documentation gaps, advises government stakeholders on risk and compliance, supports continuous monitoring, and guides vendors on FedRAMP, NIST, FISMA, RMF, and agency requirements.