Senior Product Security Engineer

The role

The Senior Product Security Engineer will lead security architecture and design reviews for high-priority products. You will conduct threat modeling, assess security implications of new technologies, and partner with engineering teams to identify and mitigate risks.

What you will do

• Lead security architecture and design reviews for high-priority Plaid products.
• Conduct threat modeling and technical security assessments of complex applications, APIs, distributed systems, and product workflows.
• Evaluate authentication, authorization, trust boundaries, sensitive data flows, and business logic.
• Review application code, investigate security weaknesses, and validate fixes.
• Assess security implications of new technologies and product capabilities, including AI-powered applications and agentic workflows.
• Partner with engineering leadership to prioritize material security risks and agree on mitigations.
• Identify recurring security weaknesses and define reusable security requirements and secure design patterns.
• Leverage AI-assisted security analysis and testing to improve security assessments.

Required qualifications

• 5+ years of experience in product or application security, with strong expertise in secure architecture, application security fundamentals, and technical risk assessment.
• Experience leading security design reviews and threat modeling for complex applications, APIs, or distributed systems.
• Deep understanding of authentication, authorization, trust boundaries, sensitive data protection, and common application security vulnerabilities.
• Strong software engineering fundamentals, including the ability to read application code, analyze vulnerability paths, and evaluate security fixes.
• Experience assessing security risks in cloud-native applications and understanding the security implications of system architecture and implementation decisions.
• Ability to communicate complex security risks, recommend practical mitigations, and influence engineering and product leadership.
• Ability to operate independently in ambiguous environments and collaborate effectively across teams.

Nice to have

• Experience securing AI-powered applications or agentic systems.
• Experience with penetration testing, vulnerability research, or security testing of complex business logic.
• Experience securing financial technology products or systems handling sensitive or regulated data.

Benefits

• Medical
• Dental
• Vision
• 401(k)

About the company

Plaid builds tools and experiences that thousands of developers use to create products. The company's network covers 12,000 financial institutions across the US, Canada, UK and Europe.