Senior Security Engineer: Threat Modeling & Developer Enablement

Mastercard; Maynooth; On-site; EUR 120,000 - 170,000; Full time

Job summary

Mastercard is seeking a Principal Security Engineer to serve as a trusted advisor to developers, coaching them to integrate security into the lifecycle. This senior, hands-on role focuses on enabling threat modeling at scale and shaping security practices across Mastercard’s development lifecycle.

You will drive adoption through collaboration, continuous feedback, and a strong developer experience, partnering closely with engineering teams and architects to embed security naturally into

Qualifications

• Senior security practitioner with hands-on experience in threat modeling and secure software design.
• Comfortable operating at scale and influencing across teams.
• Strong coaching and communication skills.
• Passionate about practical, developer-centric security practices.

Responsibilities

• Create scalable, developer-friendly threat modeling collateral (blueprints, libraries, templates).
• Implement and evolve threat modeling methodologies.
• Establish governance practices to ensure high-quality outcomes.
• Design and deliver learning programs to help engineers apply threat modeling daily.

Skills

Threat modeling

Secure software design

Developer enablement

Coaching

Communication

Job description

Mastercard is seeking a Principal Security Engineer to serve as a trusted advisor to developers, coaching them to integrate security into the lifecycle. This senior, hands-on role focuses on enabling threat modeling at scale and shaping security practices across Mastercard’s development lifecycle.

You will drive adoption through collaboration, continuous feedback, and a strong developer experience, partnering closely with engineering teams and architects to embed security naturally into