Product Security Engineer

Greenlight is a family technology company on a mission to help families raise financially smart kids and navigate life together. Its suite of products — including the Greenlight app, debit card, Safe Family GPS trackers, and Family Hub — brings together financial tools, safety features, and everyday family management in one connected experience. Designed for busy families who want convenience without compromise, Greenlight continues to innovate alongside the evolving needs of modern life. Today, more than 6.5 million family members trust Greenlight to stay in sync.

At Greenlight, we're here to make the day-to-day easier and futures brighter, so families can spend less time managing life, and more time living it. That's why we get out of bed every morning.

We are seeking an experienced and motivated Staff Product Security Engineer to join our growing Security team. This individual will be responsible for the end-to-end security of our consumer products, digital platform and an emerging hardware device line. The Staff Product Security Engineer will drive security review, threat modeling programs, lead penetration testing, manage PSIRT operations, champion secure AI adoption and establish security guardrails for AI powered products and AI assisted development workflows within a highly regulated financial services environment.   This role reports to the Senior Manager of Product Security.

Your day-to-day:

• Lead security architecture/design review and threat modeling sessions with product and engineering teams using STRIDE, PASTA and attack tree methodologies. 
• Translate threats into actionable, risk-rated engineering remediations prioritized by severity.
• Conduct hands-on penetration testing and security assessments across our full product stack producing actionable reports for engineering and leadership.
• Red-Team our AI powered products and development tools to test for prompt injection, data exfiltration,  MCP server exploitation, and tool misuse. Probe AI guardrails to ensure they hold. Experience with product security tools such as Burp Suite, Metasploit, Kali Linux, Postman, etc.
• Drive PSIRT Operations by triaging incoming vulnerability reports, leading technical investigations, coordinating remediation with engineering, scoring severity (CVSS), managing coordinated disclosure with external researchers and on-call incidents. This includes managing zero day findings, driving remediation, collaborating with engineering to patch or mitigate with compensating controls.
• Shape the posture of our AI assisted development environment defining and enforcing enterprise policies for claude and cursor. 
• Partner across the organization, sitting in design review with architects, advising product managers and engineering teams on security and compliance implications of new features, briefing executives on emerging AI threats, mentoring junior security engineers and collaborating with the AI team on securing ML pipelines.