Backed by 500 Global.
About the role
Payment Interfaces builds and operates the APIs and services that power payment experiences across Block, including Square, Cash App, and Afterpay. Our systems process payment traffic worldwide, helping sellers accept payments and customers move money reliably and securely.
What they're looking for
- Experience building, maintaining, and scaling customer-facing financial or payment APIs, together with a strong understanding of payments. This is a requirement for the role
- Experience designing and operating high-volume, highly available distributed systems where correctness, security, and reliability matter
- An understanding of payment API concerns such as idempotency, retries, asynchronous processing, backward compatibility, and handling partial failures without compromising financial correctness
- A record of leading complex engineering projects from unclear requirements through production, making technical trade-offs, and coordinating work with partner teams
- Experience diagnosing production issues and improving systems through monitoring, incident response, and preventive engineering
- Fluency with AI-assisted engineering tools and the judgment to validate generated code, protect sensitive data, and recognize when deeper investigation is needed
More about this role
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.
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.
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,...
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