Principal Product Security Engineer

Obsidian Security is the leading SaaS security platform, trusted by global enterprises like Snowflake, T-Mobile, and Algolia. We protect 200+ organizations across North America, Europe, the Middle East, Southeast Asia, Australia, and New Zealand, including many of the world’s largest Fortune 1000 and Global 2000 companies. Founded in 2017 and backed by top investors like Greylock, Obsidian was built to close a critical gap: securing SaaS apps where business happens—Microsoft 365, Salesforce, and hundreds more. The company does this by offering a complete SaaS security platform to reduce risk, detect and respond to threats, and prevent breaches at the source. Obsidian was built by leaders who redefined endpoint and identity security at CrowdStrike, Okta, Cylance, and Carbon Black. Now, they’re transforming how SaaS is secured. With AI driving rapid SaaS growth and complexity, agentic AI tools gain privileged access to sensitive data through integrations, creating new risks most security tools miss. Obsidian uniquely detects anomalous OAuth token activity and manages integration risks. Major announcements are on the horizon. Recognizing that SaaS security needs to evolve, Obsidian enables growing organizations to start with a lightweight, prevention-focused browser extension and expand coverage over time. With global momentum, a growing partner ecosystem including SentinelOne, Databricks, and Google Cloud, and a major fundraise ahead, Obsidian is scaling rapidly toward long-term growth and IPO readiness. Principal Product Security Engineer Position Overview We’re looking for a Principal Product Security Engineer to lead and scale Obsidian’s product security program across our SaaS product, cloud infrastructure, CI/CD pipelines, and related services. This is a senior, highly technical role for someone who can combine deep security engineering expertise with strong ownership, judgment, and cross-functional leadership. You’ll partner closely with Engineering, Product, GRC, IT, DevOps, SRE, and Platform teams to embed security throughout the SDLC, strengthen cloud and infrastructure security, mature threat modeling and secure design practices, and drive automation across detection, response, vulnerability management, and security testing. This role reports to the Head of Security and is ideal for a seasoned product security leader who thrives in a fast-moving, high-growth cybersecurity startup and wants to make a meaningful impact on the security of our product, customers, and organization. Key Responsibilities Lead and evolve Obsidian’s product security program, including standards, runbooks, technical documentation, and operational practices. Provide technical leadership, mentorship, and secure design guidance to security and engineering teams. Drive security architecture reviews, threat modeling, secure coding practices, and scalable security design reviews. Integrate security deeply into the SDLC through code review, SAST/DAST, fuzzing, SBOMs, dependency scanning, and CI/CD security controls. Partner with infrastructure teams to harden AWS, GCP, Kubernetes, GitLab, Terraform, data pipelines, secrets management, and service-to-service access controls. Improve security automation, monitoring, metrics, dashboards, and reporting. Lead technical response for product security incidents, vulnerability remediation, penetration testing, and red team findings. Support customer and prospect security reviews as a senior technical security expert. What We’re Looking For 10+ years of product security and/or engineering experience in cloud-native environments, ideally in cybersecurity, financial services, or another high-security industry. Strong software engineering skills, especially in Python. Hands-on expertise with Terraform, Kubernetes, AWS, GCP, GitLab, security automation, and security metrics. Deep knowledge across application security, cloud security, detection and response, vulnerability management, and secure SDLC practices. Experi