September 29, 2025
Not specified
On-site/Hybrid
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, meaningful, and lasting business, and we are helping sellers worldwide do the same.
Foundation iOS builds, maintains, and enables platform-level capabilities, architectural foundations, and developer tools that keep Square's iOS apps performant, reliable, observable, and scalable. This includes our flagship product Point of Sale and all of Square's seller-facing iOS applications.
We're the backbone that enables Square's 150+ iOS engineers to build and ship features efficiently and reliably. Our mandate spans the core infrastructure that powers Square's mobile ecosystem: from state management and dependency injection to networking primitives, data persistence, testing frameworks, and the modular architecture that enables distributed development across multiple teams.
Why? Building reliable, performance mobile applications at Square's scale requires robust foundational systems. Foundation iOS ensures that product engineers have the architectural primitives, tools, and frameworks they need to deliver high-quality experiences to Square's sellers without reinventing the wheel.
Our core systems includes:
We work closely with peer teams like UI Systems, Release Engineering, Mobile Developer Experience, and all product engineering teams.
As a staff engineer on Foundation iOS, you'll work closely with Foundation leads and technical leads across Square to set technical direction, drive architectural decisions, and evangelize foundational improvements that benefit the entire iOS organization. You'll be expected to identify system issues that span team boundaries and drive cross-functional solutions to completion.