Principal Security Engineer

Principal Security Engineer

The Principal Security Engineer serves as a trusted advisor and partner to developers, providing hands‑on support, coaching, and real‑time guidance to integrate security seamlessly into the development lifecycle. This role plays a critical part in shaping how security and threat modeling is taught, adopted, reviewed, and governed across Mastercard’s development lifecycle. The focus is on making security accessible, actionable, and aligned with how developers actually build software, driving adoption through collaboration, continuous feedback, and a strong developer experience.

This is a senior, hands‑on security leadership role focused first and foremost on developer enablement and engagement, responsible for driving security excellence at scale across Mastercard. The Principal Security Engineer blends deep individual‑contributor expertise with practice‑building leadership, including:

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• Creating scalable, developer‑friendly threat modeling collateral such as blueprints, threat libraries, and templates
  
• Implementing and evolving threat modeling methodologies
  
• Establishing review and governance practices that support consistent, high‑quality outcomes
  
• Designing and delivering formal learning and enablement programs that help engineers and architects confidently apply threat modeling in their day‑to‑day work
  

The role partners closely with development teams to embed security naturally into workflows, ensuring security enhances—not hinders—delivery.

You are a senior security practitioner with deep, hands‑on experience in threat modeling and secure software design. You are comfortable operating at scale, influencing across teams, and working directly with developers and architects. You combine technical depth with strong coaching and communication skills, and you are passionate about building practical, developer‑centric security practices. xcfaprz You thrive in environments where collaboration, continuous improvement, and strong developer experience are key to success.