Senior Staff iOS Engineer

It all started with an idea at Block in 2013. Initially built to take the pain out of peer-to-peer payments, Cash App has gone from a simple product with a single purpose to a dynamic ecosystem, developing unique financial products, including Afterpay/Clearpay, to provide a better way to send, spend, invest, borrow and save to our 50+ million monthly active customers. We want to redefine the world’s relationship with money to make it more relatable, instantly available, and universally accessible.

Today, Cash App has thousands of employees working globally across office and remote locations, with a culture geared toward innovation, collaboration and impact. We’ve been a distributed team since day one, and many of our roles can be done remotely from the countries where Cash App operates. No matter the location, we tailor our experience to ensure our employees are creative, productive, and happy.

The role

We build native foundations that support seller-facing software across multiple teams. You will set direction for iOS architecture, performance, reliability, security, and developer experience. You can start from an important, unowned problem, prove a direction through hands-on work, and create a program other teams can join. You may begin as the sole expert, but your goal is to create leverage through clear interfaces, documentation, and new technical leaders.

You will

• Find and frame systemic iOS problems that do not yet have clear ownership.
• Define strategy, architecture, standards, and measures of success across teams and applications.
• Build prototypes, reference implementations, and the critical path needed to prove the direction.
• Lead multi-quarter migrations and foundational initiatives through broad adoption.
• Establish durable practices for quality, testing, observability, release safety, and maintainability.
• Develop senior engineers and create an ownership model that does not depend on you as a permanent bottleneck.

How you work

• You are self-directed and actively gather the context, data, and domain expertise needed to make sound decisions.
• You move independently within your scope and seek alignment when decisions affect other teams or create long-term commitments.
• You use AI tools to investigate and deliver at greater scale. You verify the work and remain accountable for security, reliability, and customer trust.
• You measure success through adoption and seller or customer outcomes, not the production of frameworks or documents.

Qualifications

• 12+ years of professional software engineering experience.
• 8+ years in roles where mobile engineering was a primary responsibility, including 4+ years building native iOS products.
• Deep expertise across modern and legacy iOS frameworks, Swift, and Objective-C.
• Experience creating foundational systems, shared frameworks, or developer tooling used across multiple teams.
• A record of leading strategic, multi-quarter initiatives with broad adoption and durable impact.
• Experience connecting platform strategy to customer-facing and multi-tenant SaaS products that support business operations.
• Strong systems thinking, technical communication, mentoring, and organizational influence.

Technologies we use and teach

Swift, Objective-C, SwiftUI, UIKit, Swift Concurrency, Combine, Xcode, Instruments, Protocol Buffers, Bazel, testing infrastructure, observability tools, and AI-assisted development tools.

 

We’re working to build a more inclusive economy where our customers have equal access to opportunity, and we strive to live by these same values in building our workplace. Block is an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We will consider qualified applicants with arrest or conviction records for employment in accordance with state and local laws and “fair chance” ordinances.

We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations to disabled applicants throughout the recruitment process. We encourage applicants to share any needed accommodations with their recruiter, who will treat these requests as confidentially as possible. Want to learn more about what we’re doing to build a workplace that is fair and square? Check out our I+D page.

While there is no specific deadline to apply for this role, U.S. roles are typically open for an average of 55 days before being filled by a successful candidate. Please refer to the date listed at the top of this job page for when this role was first posted.