Senior Software Engineer, Payments

WonderschoolSan Francisco

seniorPosted 17 Oct 2026

About the role

<h1>Senior Software Engineer, Payments</h1>

<p><strong>Location:</strong> San Francisco (Rincon Hill)</p>

<hr>

<h2>Company Overview</h2>

<p><strong>Mission:</strong> Make high-quality early childhood education accessible to all by empowering childcare providers with tools and support while helping parents find quality learning environments.</p>

<p><strong>What We're Building:</strong> 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.</p>

<hr>

<h2>The Role</h2>

<p>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.</p>

<hr>

<h2>What You'll Do</h2>

<ul>

<li>Build alongside a dedicated payments team: consolidate and refactor a payments system assembled from many legacy system integrations</li>

<li>Build and maintain integrations across banking, debit cards, Stripe, SAP, partner advances, payroll, and our billing platform</li>

<li>Own the orchestration and tracking/reconciliation layer across our third-party fintech partners</li>

<li>Design for correctness first, because money movement demands it</li>

<li>Work directly with customers to understand real-world failure modes and edge cases</li>

<li>Partner daily with product to build, ship, measure, and iterate</li>

<li>Build within the laws and regulations governing payments and financial services</li>

</ul>

<hr>

<h2>Who You Are</h2>

<ul>

<li>Senior engineer with a strong payments background and real experience building payment systems and integrations (fintech a plus)</li>

<li>Exceptionally high attention to detail; strong finance background is a plus</li>

<li>Excited to be close to the build and close to customers</li>

<li>Likes working on a small team and moving fast; bias toward action</li>

<li>Comfortable with the regulatory landscape around payments, banking, and cards</li>

<li>Uses AI tools and figures things out independently</li>

</ul>

<hr>

<h2>Compensation & Benefits</h2>

<ul>

<li><strong>Base salary:</strong> Competitive market rate</li>

<li><strong>Equity:</strong> Significant, meaningful ownership</li>

<li>Full health coverage</li>

<li>Wellness stipend (gym and office)</li>

<li>Travel stipend for certain circumstances</li>

</ul>

<hr>

<h2>Application</h2>

<p>Apply with your resume and a short note on the most complex payments or integration system you have built.</p>

<p>This is a full-commitment, full-ownership role, based in our San Francisco office. You will work very closely with the CEO, in office five to six days a week.</p>

From Wonderschool's careers page on Greenhouse. See the original posting. OneProfile isn't the employer and doesn't take applications; you apply on their site.

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