Security Engineer Job at Modern Treasury in San Francisco

Overview

Modern Treasury is the operating system for 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. This role is based in San Francisco or New York.

Modern Treasury’s mission is to build the most trusted financial infrastructure for global money movement. We’re expanding deeper into money movement and building new products that move funds across 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.

What You’ll Do: this role sits at the intersection of security, infrastructure, platform, and payments engineering. You’ll shape how Modern Treasury manages risk at scale and design systems that enable programmatic, compliant money movement while keeping trust, compliance, and safety at the core of our platform.

Responsibilities

• 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

Required Experience

• 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

What Sets You Apart

• 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

Technologies We Use

• Ruby on Rails for our backend framework
• React, GraphQL, and Tailwind CSS on the front end
• Postgres for our database
• AWS for infrastructure and hosting
• Docker for containerization
• GitHub for source code management
• Buildkite for continuous integration
• Reg tech and anti-fraud platforms

About Modern Treasury

Modern Treasury is the operating system for money movement. Our payments platform combines a suite of APIs and dashboards to help companies unlock new payments revenue, strengthen customer experiences, and drive efficiency through their business. Our end-to-end platform moves enterprises forward with faster payments, efficient workflows, and full data visibility.

Modern Treasury is committed to equal employment opportunity and does not discriminate in any employment opportunities or practices based on race, color, creed, gender (including gender identity and gender expression), religion, marital status, national origin or ancestry, age, physical or mental disability, political affiliation, medical condition, genetic information, sexual orientation, military and veteran status or any other consideration made unlawful by federal, state, or local laws. It also prohibits unlawful discrimination based on the perception that anyone has any of those characteristics, or is associated with a person who has or is perceived as having any of those characteristics.

Modern Treasury participates in E-Verify and will provide the federal government with your Form I-9 information to confirm that you are authorized to work in the U.S.

Compensation Range: $180K - $240K

Details

• Seniority level: Mid-Senior level
• Employment type: Full-time
• Job function: Information Technology
• Industries: Technology, Information and Internet

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