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Principal Security Engineer

Block· 10404 Engineering - Information Security
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Bay Area, CA$319k - $478.6kfull-timePosted 3mo ago

About the role

Senior technical leader focused on software security engineering at Block, responsible for setting the bar for security excellence, driving innovative software solutions, and shaping the Secure by Design culture across Block’s product and infrastructure teams.

Responsibilities

  • Software Security Innovation: Deliver world-class and innovative software solutions to security problems, tackling top risks such as technology fragmentation and security after-the-fact.
  • Technical Strategy & Architecture: Define the multi-year technical strategy for software security and guide architectural decisions.
  • Cross-Cutting Solution Leadership: Lead development of common, high-leverage security solutions across Block’s business units to combat data sprawl and overpermissioning.
  • Drive engineering excellence for critical systems like tokenization platforms, ensuring integrity, performance, and scalability.
  • Spearhead security strategy and engineering excellence for mobile software and platforms.
  • Champion security reliability engineering (SecRelEng) practices to improve resilience and availability of security services and infrastructure.
  • Execution Excellence: Lead technical planning and implementation for high-priority security initiatives and act as a technical decision maker.
  • Consultation & Guidance: Integrate security practices early in SDLC and provide security architecture review and threat modeling for critical systems.
  • Mentorship & Enablement: Mentor engineers on technical execution, system design, and technology choices; drive knowledge sharing and documentation.

Qualifications

  • Track record of exemplary technical leadership and decision-making at a Principal or equivalent level (L8+ preferred).
  • 10+ years of experience developing and shipping production software and critical services, with at least 5 years in establishing and scaling security practices in a large, modern tech environment.
  • Mastery of system design and architecture with experience solving ambiguous, domain-heavy problems.
  • Deep technical understanding of security vulnerabilities, risks, countermeasures, and compensating controls in high-volume, real-time transaction processing environments.
  • Exceptional collaboration and communication skills with ability to influence executive leadership and direct engineering teams on security roadmaps.
  • Demonstrable ability to write production-quality code/script for security automation and tooling.

Skills

Required:Technical leadershipSecurity architecture & designSecure SDLC / security integration into development lifecycleSecurity tooling & automation

Benefits

  • Remote work
  • Medical insurance
  • Flexible time off
  • Retirement savings plans
  • Modern family planning
Last updated Jul 8, 2026. Interested? Apply on the company site.
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About Block

Block builds technology to increase access to the global economy.

Made up of Square, Cash App, Afterpay, TIDAL, Bitkey, and Proto, Block, Inc. builds technology to increase access to the global economy.

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