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Senior Software Engineer, Payments

Wonderschool
San Francisco Posted Jul 12, 2026
Full-time

About this role

Senior Software Engineer, Payments

Location: San Francisco (Rincon Hill)

Company Overview Mission: Make high-quality early childhood education accessible to all by empowering childcare providers with tools and support while helping parents find quality learning environments. What We're Building: A category-defining platform at the intersection of marketplace, SaaS, and public sector systems, increasingly powered by AI. Series B backed by a16z, Goldman Sachs, and First Round.

The Role Own the engineering behind a payments platform that processes at least $3 billion through our platform, working alongside a small, dedicated team. We move money across banking, debit cards, Stripe, SAP, partner advances, and payroll, we run our own billing platform, and we lean on third-party partners for most of our fintech capabilities, so much of this is integration, orchestration, and tracking work. There is a lot to build here. You will consolidate and refactor a system built across many legacy integrations into something clean, reliable, and fast, and you will spend a lot of time directly with customers.

What You'll Do

  • Build alongside a dedicated payments team: consolidate and refactor a payments system assembled from many legacy system integrations

  • Build and maintain integrations across banking, debit cards, Stripe, SAP, partner advances, payroll, and our billing platform

  • Own the orchestration and tracking/reconciliation layer across our third-party fintech partners

  • Design for correctness first, because money movement demands it

  • Work directly with customers to understand real-world failure modes and edge cases

  • Partner daily with product to build, ship, measure, and iterate

  • Build within the laws and regulations governing payments and financial services

  • Who You Are

  • Senior engineer with a strong payments background and real experience building payment systems and integrations (fintech a plus)

  • Exceptionally high attention to detail; strong finance background is a plus

  • Excited to be close to the build and close to customers

  • Likes working on a small team and moving fast; bias toward action

  • Comfortable with the regulatory landscape around payments, banking, and cards

  • Uses AI tools and figures things out independently

  • Compensation & Benefits

  • Base salary: Competitive market rate

  • Equity: Significant, meaningful ownership

  • Full health coverage

  • Wellness stipend (gym and office)

  • Travel stipend for certain circumstances

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