Staff Software Engineer, Payments Acquiring

About the Role

<p>Since we opened our doors in 2009, the world of commerce has evolved immensely, and so has Square. After enabling anyone to take payments and never miss a sale, we saw sellers stymied by disparate, outmoded products and tools that wouldn’t work together.<br><br>So we expanded into software and started building integrated, omnichannel solutions – to help sellers sell online, manage inventory, offer buy now, pay later functionality, book appointments, engage loyal buyers, and hire and pay staff. Across it all, we’ve embedded financial services tools at the point of sale, so merchants can access a business loan and manage their cash flow in one place. Afterpay furthers our goal to provide omnichannel tools that unlock meaningful value and growth, enabling sellers to capture the next generation shopper, increase order sizes, and compete at a larger scale.<br><br>Today, we are a partner to sellers of all sizes – large, enterprise-scale businesses with complex operations, sellers just starting, as well as merchants who began selling with Square and have grown larger over time. As our sellers grow, so do our solutions. There is a massive opportunity in front of us. We’re building a significant, meaningful, and lasting business, and we are helping sellers worldwide do the same.</p> <h4><strong>The Role</strong></h4> <p>At Block, we strive to build the best financial products in the world. The Financial Platform Acquiring team owns the acquiring side of card payments for Square, Cash App, and Afterpay. When someone pays with a card at a Square seller, through Afterpay, or uses a card to move money in or out of Cash App, our systems make sure that payment happens correctly, every time.</p> <p>We take in and tokenize card data from chip, tap, digital wallets, and online checkout, route each payment, and get it authorized over our direct network connections and acquiring partners. Then we capture, clear, and settle it, in the US and internationally. Across Square and Cash App, Block processed nearly $260 billion in payment volume in 2025, and we run our own direct connections to card networks in several countries alongside our acquiring partners. When a customer taps their card at a register, our systems route the authorization and bring back the issuer's answer in under a second, around the clock, in partnership with card networks and bank partners.</p> <p>As a Staff Software Engineer on the Acquiring team, you will bring deep card payments experience to some of the most complex technical work on our roadmap. That work includes expanding our direct network and acquirer connections, delivering network mandates, and making it cheaper and more reliable to accept cards. You will lead one or two of these projects at a time. If you have worked deep in the card payment stack, at a payments company, a card network, or a large merchant, and want to own hard problems at Block's scale, this role is built for you.</p> <p>This is a hands-on role. You will build systems and tooling, debug at the message level, and turn your payments expertise into durable capabilities that other engineers can use. Much of the team built its payments depth here at Block. You will bring a view of how other companies solve the same problems, and learn our systems from a team that knows them deeply.</p> <p>In your first year, you will ship at least one of those projects to production, leave behind standards and tooling that make the next one easier, and share what you learned elsewhere so the whole team goes deeper. You will report to the engineering manager for Acquiring.</p> <p>This role works US West Coast hours, from our Bay Area or Seattle offices or remotely within the Pacific time zone. The team is mostly in US Eastern and Australian time zones, and Pacific hours overlap with US Eastern in the morning and with Melbourne in the late afternoon.</p> <h4><strong>You Will</strong></h4> <ul> <li>Bring deep card acceptance expertise to the team, reading network specifi