This position can be based out of San Francisco, New York, or remote (we accept candidates from the following states: AZ, CA, CO, CT, FL, GA, HI, IL, MA, MI, MN, MT, NC, NJ, NV, NY, OH, OK, OR, PA, TN, TX, UT, WA, WI).
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 as well as build secure, compliant financial products while contributing directly to the reliability and automation of our security and infrastructure systems.
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, deploy and operate the security controls that make this possible and set the foundation for compliant, programmable money movement at scale.
This role is hands-on security engineering with heavy focus on automation.
ABOUT THE ROLE
This role focuses on application, product, and infrastructure security, and sits at the intersection of security, platform, payments engineering, and infrastructure. You’ll shape how Modern Treasury manages risk at scale and design the systems that make programmatic, compliant money movement possible. We are looking for someone who can influence security strategy, drive DevSecOps automation and contribute to architectural design.
Your work will ensure that as we grow into new products and payment rails, we continue to move fast while keeping trust, compliance, and safety at the core of our platform.
WHAT YOU’LL DO
Lead application security across our payment platform, including secure code review, threat modeling, and security architecture for new products
Own product security for new payment rails, including FBO account structures, stablecoin integration, and enhanced compliance features
Design and implement DevSecOps tooling and automation to improve security posture across CI/CD and infrastructure
Partner with engineering teams to embed security into the development lifecycle through automation, secure design patterns, and security champions
Drive security architecture decisions for customer-facing APIs, authentication systems, and data protection controls
Build monitoring and detection capabilities for application-layer threats, API abuse, and fraud patterns
Design infrastructure monitoring, automation, and remediation practices that keep our systems resilient and trustworthy
Collaborate with Compliance and Legal to ensure product features meet regulatory requirements (BSA/AML, KYC/KYB, state money transmission)
Influence technical strategy across Product, Platform, and Infrastructure teams on security and risk management
WHAT YOU SHOULD HAVE
Required Experience
6+ years in security engineering, with 3+ years focused on application and product security
Strong experience with:
Full-stack application security (frontend, backend, APIs)
Authentication and authorization systems and identity management
Infrastructure automation related to security (AWS, Docker, CI/CD pipelines)
Fraud detection, prevention, and abuse mitigation in payment or financial products
Secure SDLC practices and developer security tooling
Experience with incident response and security monitoring
Knowledge and experience with application security for Ruby on Rails, GraphQL, JavaScript, React, and containerized environments
Payments engineering experience, ideally including fraud prevention and risk controls in money movement systems
What Sets You Apart
2+ years in payments or fintech, with a deep understanding of money movement security challenges
Familiarity with compliance and regulatory standards for money movement, such as PCI DSS, BSA/AML, and KYC/KYB
Experience with payment processing security across ACH, wires, card networks, and emerging rails
Experience building controls for fraud detection, chargeback prevention, and abuse mitigation in payment systems
Experience integrating security into DevOps workflows (e.g., Buildkite, IaC, AWS security automation)
Experience with stablecoin security, blockchain integrations, or crypto payment rails
Track record of balancing pragmatic risk management with business velocity
Demonstrated ability to lead security initiatives across multiple teams without direct authority
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
Buildkite for continuous integration
RegTech 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, full data visibility.
Modern Treasury is committed to equal employment opportunity and does not discriminate in any employment opportunities or practices based on an individual's race, color, creed, gender (including gender identity and gender expression), religion (all aspects of religious beliefs, observance or practice, including religious dress or grooming practices), marital status, registered domestic partner status, age, national origin or ancestry (including language use restrictions and possession of a driver’s license issued under California Vehicle Code section 12801.9), natural hair, physical or mental disability, political affiliation, medical condition (including cancer or a record or history of cancer, and genetic characteristics), sex (including pregnancy, childbirth, breastfeeding or related 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.
Modern Treasury is the operating system for the new era of payments, helping companies unlock growth, enhance customer experiences, and drive efficiency. The payment operations platform and best-in-class developer tools move companies forward with faster payments, effective workflows, full data visibility, and seamless bank integrations. Founded in 2018, San Francisco-based Modern Treasury serves leading companies across broad sectors of the economy like ClassPass, gusto, Marqeta, Procore, Navan, and more and is backed by investors Altimeter Capital, Benchmark, and Y Combinator.
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Our Why
We strive to become one of the best companies in the world by:
Helping our customers build their own best companies. We build products to support our customers’ goals. We deliver on time and provide exceptional service. We aspire to do things right the first time, and if something goes wrong, we rectify it.
Creating the conditions for personal and professional growth. We design our work environment to be uplifting and enriching, a place to engage in meaningful work, constantly learn, and pursue our long-term career journeys. Together, we create a space of psychological safety. We embrace diversity of thought, respectful debate, and intellectual curiosity.
Making decisions for longevity. We focus on profitability, which protects our employees’ livelihoods and ensures our continued ability to serve customers. We do so with decency, dignity, and truthfulness, earning us the right and privilege to remain in business.
We will sometimes fall short, but we are unapologetic about striving. We commit to the never-ending work it takes to build one of the world’s best companies.
