Senior Software Engineer, Payments

AtoB
San Francisco, Montreal
Workplace: OnsiteFull time150,000 - 190,000 annuallyFunction: Software EngineeringExperience: 5+ yearsSkills: ["Communication","Ownership","Collaboration","Problem-solving","Documentation"]

Senior Software Engineer focused on payments at a high-growth fintech, building scalable backend systems for multi-provider reconciliation, general ledger infrastructure, and money movement across diverse rails. You’ll own backend projects end-to-end, collaborate with product and GTM teams, and help scale systems to billions in annual payment volume while ensuring accuracy and reliability.

Loading

Loading job details...

Preparing the role view and application actions.

FursaFursa
AtoB
AtoB
1 year ago

Senior Software Engineer, Payments

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 20 hours agoStatus: Live

Job Summary

Senior Software Engineer focused on payments at a high-growth fintech, building scalable backend systems for multi-provider reconciliation, general ledger infrastructure, and money movement across diverse rails. You’ll own backend projects end-to-end, collaborate with product and GTM teams, and help scale systems to billions in annual payment volume while ensuring accuracy and reliability.
Location: San Francisco, Montreal
Workplace: Onsite
Employment Type: Full time
Job Function: Software Engineering
Seniority: Sr. Manager level

Key Responsibilities

  • •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

Pay and Benefits

Salary: 150,000 - 190,000 annually
Equity and Bonus:Equity
Schedule:4-Day Week
Perks:EquityAnnual Bonus

Key Requirements

  • •5+ years of professional experience building B2B or B2C SaaS products (FinTech, payments, or marketplace a plus)
  • •Experience with React, Ruby, and PostgreSQL (demonstrated deep coding skills)
  • •Prior payments or back-office fintech experience is a plus
  • •Role requires in-office work 4 days/week (Mon-Thurs) in the San Francisco Bay Area or Montreal
  • •Strong ownership mindset, ability to balance speed with rigor, automated tests, clean abstractions, and clear documentation
Experience:5+ yearsFinTechPaymentsSaaS
Skills:CommunicationOwnershipCollaborationProblem-solvingDocumentation
Tech Stack:ReactRubyPostgreSQLStripeJPMorganCheckbookHighnoteFragment

Company Brief

AtoB
Provides payments and working-capital solutions tailored to fleets and the trucking industry, including fuel and spend cards, instant payments, and fraud protections to modernize transportation finance operations.
Industry: Fintech Infrastructure
Company Size: Medium (51 to 250 employees)
Growth: Growth Stage Startup
Funding: Series C
Headquarters: San Francisco, United States
Founded: 2019
Glassdoor
Glassdoor: 4.0
WebsiteLinkedInGlassdoor