Senior Software Engineer, Payments

- Lead efforts to reconcile transactions across multiple financial providers, including Stripe, Highnote, Checkbook, and JPMorgan, ensuring accuracy and consistency across systems.

- Ensure full alignment between internal records and customer-facing balances-what's in the bank should precisely match what the customer sees.

- Contribute to the development and ongoing scalability of our general ledger infrastructure, supporting accuracy, resilience, and growth.

- Partner with our external ledger provider, Fragment, to build a reliable system capable of powering billions of transactions with speed and integrity.

- Design and implement new money movement flows across a variety of payment rails-including push-to-card and wire transfers-optimizing for cost, speed, and reliability.

- Own critical backend & platform projects end-to-end-from design to production ops.

- Push architecture that scales to billions in annual payment volume and real-time risk controls.

- Work closely with product and GTM leads to turn ambiguous problems into elegant code.

- Have 5+ years of professional experience building B2B or B2C SaaS products (FinTech, payments, or marketplace a plus).

- Prior payments or back office fintech experience is a plus

- Balance speed with rigor-automated tests, clean abstractions, clear docs.

- Can dive deep into code (we use React, Ruby, Postgres-but great engineers pick up tools fast).

- This role is required to be in office 4 days/week (Mon-Thurs) either in San Francisco Bay Area or Montreal