Modern Treasury

Payment operations tools for money movement.

Software Engineer - Data Storage at Modern Treasury

San Francisco, New York or Remote / Remote
Job Type
Apply to Modern Treasury and hundreds of other fast-growing YC startups with a single profile.
Apply to role ›

About the role


We're looking for a data storage-focused software engineer to join our Engineering team. In this role, you will be the architect of the data storage layer for several of Modern Treasury's products such as payments and ledgers. Our payments product is the core of our platform that helps businesses move and track money, reconciling over $2B+ in volume per month. The ledgers product is a novel managed database product that helps customers maintain a source of truth for high-volume financial transactions and is already tracking hundreds of millions of customer dollars for customers.

Each of our products involve complex data management — storage and retrieval with critical concurrency and integrity requirements. We are looking for a storage expert who can inform key architectural decisions during development. Specifically, this part of our team might be right for you if:

  • You have designed and built distributed data architectures for payments and related systems, solving problems like optimal models, transactions, queries, caching or quickly computing important calculations. You're comfortable diving into cache strategies, database query plans, and investigating slow queries.

  • You know how to guarantee reliability, concurrency, integrity and security of data at scale, implementing optimizations and load testing for a high-throughput API

  • You have a keen product sense and have built customer interfaces for hosted data management products such as transaction ledgers or other cataloging, bookkeeping products

Our API is often the most critical piece of infrastructure that our customers use. We place a premium on building robust, scalable systems that can sustain a high volume of API calls and exceed the reliability requirements to move money at scale. We complement this with well-thought out interfaces for our users and pride in writing quality API docs.

We believe in using the best tool for the job, rather than always using open source or building things ourselves. We actively embrace open source in parts of our system but aren't afraid to roll our own solution for things like writing and parsing bank files. We also contribute to open source (for example,

In addition to our API, we have had a web platform since day 1 that is used by accountants, controllers, and engineers. They use our platform to do things like manage payment workflows and monitor their business. As an engineer, you will work with our product team to build products and features for these users.


Modern Treasury is payment operations software for businesses with a high volume of transactions or complex payment flows. Modern Treasury automates the full cycle of money movement — from payment initiation, through approvals, to reconciliation and tracking.

Our mission is to transform the way businesses move and track money, driving toward a world where payments are real-time, reconciliation is instant, and accounting is continuous.


During your first week you will:

  • Get to know our leadership, culture, and values

  • Onboard with the engineering team

  • Ship your first commit on day 1

  • Take on 1-2 small tickets to address bugs or make minor improvements

  • Read our favorite industry primers

During your first six weeks you will:

During your first six months you will:

  • Work with our product team to scope and ship products for both our engineering and finance users

  • Help grow our team by mentoring new engineers, writing internal tooling and documentation, and interviewing new hires


  • Experience building web applications professionally for 2+ years

  • Experience working with SQL/Relational databases


  • Ruby on Rails for our backend framework

  • React, GraphQL, and Tailwind CSS on the front end

  • Postgres for our database

  • Redis for caching

  • AWS for infrastructure and hosting

  • Docker for containerization

  • GitHub for source code management

  • Buildkite for continuous integration


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.

Why you should join Modern Treasury

Modern Treasury builds payments operations solutions. We believe that payment operations is at the core of every business. Our tools automate the full cycle of money movement—from payment initiation, through approvals, to reconciliation—and are accessible through web application or API.

We’re a lean team and we work hard to build outstanding products for our customers. When we succeed, our customers grow.