Modern Treasury-posted 3 months ago
San Francisco, CA
101-250 employees

This position is based in our San Francisco or New York office. Modern Treasury’s mission is to build the most trusted financial infrastructure for global money movement. We’re looking for a Security Engineer to design and strengthen the controls that protect our payment infrastructure. You’ll enable teams to build secure, compliant financial products without slowing down development. Modern Treasury is expanding deeper into money movement. We’re building new products that will let customers move funds across both traditional rails and emerging technologies, including stablecoins. You’ll help design and operate the security controls that make this possible and set the foundation for compliant, programmable money movement at scale.

  • Strengthen the security foundation of Modern Treasury’s payments infrastructure to protect money movement at scale
  • Help reduce fraud, prevent abuse, and safeguard customer data as we expand into new rails and stablecoins
  • Shape how engineering teams build secure, compliant products without slowing down development
  • Design automation, monitoring, and remediation practices that keep our systems resilient and trustworthy
  • Influence the future of financial infrastructure by embedding strong security practices into our systems and culture
  • 7+ years of security engineering experience, including 2+ years in the payments industry
  • Hands-on expertise with AWS security services
  • Strong background reviewing and securing full stack application code (frontend, backend, and APIs)
  • Frontend security knowledge (JavaScript, modern web frameworks, browser security models)
  • Proficiency in secure API design, authentication and authorization, applied encryption, and PCI DSS compliance
  • Experience with infrastructure as code (Terraform) and CI/CD security (SAST/DAST scanning)
  • Payments experience, ideally including fraud prevention, NACHA rules, and risk controls in money movement systems
  • Deep understanding of payment processing security across ACH, wires, card networks, and emerging rails
  • Experience building controls for fraud detection, chargeback prevention, and abuse mitigation in payments systems
  • Familiarity with NACHA operating rules and regulatory standards for money movement
  • Proven experience securing high-throughput systems (>10K TPS) and multi-tenant architectures
  • Knowledge of application security for Ruby on Rails, GraphQL, and containerized environments
  • Familiarity with SIEM tools, vulnerability scanning, and incident response procedures
  • Track record of balancing strong security requirements with engineering velocity
  • Clear communication skills to collaborate across Product, Platform, Infrastructure, and Compliance teams
  • Data-driven approach to prioritizing security investments and mitigating risk
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