Principal Security Engineer
$319,000–$478,600 year
On-siteSan Francisco, California, United States
Job Summary
Principal Security Engineer at Block focused on Software Security Engineering. Lead technical direction for secure-by-design software solutions, champion security practices across engineering and InfoSec, drive multi-year security strategy, and oversee architecture and implementation of security solutions for Block’s core products and infrastructure. Responsibilities include defining technical strategy, leading cross-cutting security initiatives, guiding Secure SDLC and threat modeling for critical systems, mentoring engineers, and delivering secure, scalable security tooling and platforms across business units like Square and Cash App.
Required Qualifications
- Track record of exemplary technical leadership and decision-making at a Principal or equivalent level (L8+ technical capabilities preferred).
- 10+ years of experience developing and shipping production software and critical services, with a minimum of 5 years focused on establishing and scaling security practices in a large, modern technology environment.
- Mastery of system design and architecture, with demonstrable experience solving ambiguous, domain-heavy problems by structuring the approach, clarifying scope, and driving clarity among stakeholders.
- Deep technical understanding of security vulnerabilities, risks, countermeasures, and compensating controls, particularly in high-volume, real-time transaction processing environments.
- Exceptional collaboration and communication skills, with proven ability to influence executive leadership and direct engineering teams in prioritizing security roadmap items to balance security and business risks.
- Demonstrable ability to write production-quality code/script for security automation and tooling.
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