Staff Product Security Engineer

Senior Staff Product Security Engineer at Phantom, remote. Lead security reviews, secure SDLC, AI-assisted code review, supply chain security, incident response.

Product Security Ownership: Partner with engineering teams to identify and address security risks across Phantom’s mobile applications, web products, APIs, and backend services. Architecture and Threat Modeling: Lead security reviews for new products and major architectural changes, with particular attention to authorization boundaries, sensitive data, transaction integrity, key material, and third-party integrations. Secure Product Development: Embed practical security controls into the software development lifecycle, from design and implementation through testing, release, and production operation. Code Review and Security Testing: Perform AI assisted security code reviews and targeted testing of high-risk features. Build repeatable approaches that help find vulnerabilities before they reach production. Security Tooling: Develop and improve tooling that gives engineers fast, actionable security feedback without creating unnecessary friction. Use automation and AI-assisted workflows where they materially improve coverage or speed. Software Supply Chain Security: Harden CI/CD, build, and release systems against supply chain threats, including dependency risk, secrets exposure, build provenance, artifact integrity, and compromised developer or automation workflows. Vulnerability Management: Triage findings from internal testing, researchers, bug bounty submissions, and third-party assessments. Work with owners to determine real-world impact and drive issues through verified remediation. Incident Response: Support the investigation of product security incidents and suspicious activity. Turn lessons from incidents into durable improvements to product architecture, detection, and engineering standards. Technical Leadership: Establish product security patterns and expectations across engineering. At the Staff level, lead ambiguous, cross-functional initiatives and influence architecture beyond any single product team.

5+ years of experience in product security, application security, security engineering, or software engineering, including experience operating at a senior or staff level. Strong understanding of web, mobile, API, and distributed-system security, including authentication, authorization, session management, cryptography, and common vulnerability classes. Hands-on experience building or applying AI-assisted security tooling to test applications and APIs, combining automated analysis with source-code review and manual validation. Demonstrated ability to review production code in one or more languages such as TypeScript, JavaScript, Rust, Python and Go. Experience securing software supply chains and CI/CD systems, including dependencies, build infrastructure, secrets, artifacts, signing, and release integrity. Experience threat modeling complex products and translating security risks into concrete engineering requirements. Strong judgment when evaluating exploitability, business impact, and appropriate remediation. Track record of partnering effectively with engineering and product teams while maintaining a high security bar. Clear written and verbal communication, including the ability to explain technical risk to both engineers and non-security stakeholders.