Senior Android Engineer, Square Banking

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.

The Role

The Banking Mobile team is a mobile development team focused on delivering high quality and seamless banking experiences. The team is responsible for both the mobile product surface for all of Square’s banking products, and also a backend service that orchestrates service APIs to power our banking products. You will design, develop, and maintain functionality for Square’s entire Banking product ecosystem. You will collaborate with other mobile and backend engineers plus our product and design teams to ensure that millions of merchants have a remarkable and reliable experience banking with Square. Mobile is a high priority for the Square Banking organization.

You Will

• Lead the architecture, design, and implementation of critical features within our Banking product suite.
• Represent the team in architectural discussions and stakeholder conversations, serving as a bridge between our team and the broader organization.
• Help shape the future of our codebase by building flexible, extendable, and reusable components.
• Foster a culture of engineering excellence and mentor engineers of all experience levels.
• Hold yourself and your teammates to the highest standard of engineering excellence, with unwavering attention to product reliability.
• Work with product managers, designers, and data scientists to shape the future of Banking at Square.
• Help contribute to a culture of positivity, psychological safety, and inclusivity within the team.
• Mentor other engineers on Android best practices and architectural patterns
• Contribute to the technical direction of our Android codebase
• Use AI tools to accelerate the impact of yourself and your team.

You Have

• Relevant Bachelor's degree (or equivalent practical experience) plus 8+ years experience in Android software development. 
• Strong technical problem-solving skills with a proven track record of debugging and resolving complex technical issues
• Experience building and shipping substantial features in production Android applications
• Deep understanding of Android architecture patterns, lifecycle management, and performance optimization
• Track record of mentoring other engineers and providing technical leadership within a team
• Understanding of payment systems and point of sale workflows is valuable but not required
• (optionally) Backend service engineering experience

Technologies We Use and Teach

• Kotlin for mobile and backend development, leveraging Square’s modern open source library, Workflow
• Espresso and Snapshot for testing
• Vendor SDKs, Service APIs, and Protocol Buffers
• Gradle for our build environment
• AI tools including Goose and Cursor
• We also use LeakCanary, RXJava, Dagger, Mortar, and Okhttp among others