Principal Security Engineer
SearchStax
AWSCloudOpen SourcePythonTerraform
Security Engineer
Modern Treasury
full-time
Posted on:
Location Type: Hybrid
Location: San Francisco • California, New York • 🇺🇸 United States
Visit company websiteSalary
💰 $180,000 - $240,000 per year
Job Level
SeniorLead
Tech Stack
AWSGraphQLJavaScriptRubyRuby on RailsTerraform
About the role
- 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 the company expands 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 systems resilient and trustworthy
- Shape how Modern Treasury manages risk at scale and design systems that make programmatic, compliant money movement possible
- Embed strong security practices into systems and culture and influence the future of financial infrastructure
Requirements
- 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
- Position is based in San Francisco or New York office
- Modern Treasury participates in E-Verify and will provide Form I-9 information to confirm U.S. work authorization
Benefits
- Offers Equity
- Generous benefits and company equity
ATS Keywords
Tip: use these terms in your resume and cover letter to boost ATS matches.
Hard skills
security engineeringAWS security servicesfull stack application code reviewfrontend securitysecure API designauthentication and authorizationapplied encryptionPCI DSS complianceinfrastructure as codeCI/CD security
Soft skills
clear communicationcollaborationdata-driven decision makingbalancing security and velocity
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