Staff iOS Software Engineer, Bitcoin

Bitcoin at Block builds products and platforms that help make bitcoin, stablecoins, and non-custodial wallets accessible to people around the world. We work across Cash App, Square, and Bitkey to create secure, reliable, high-quality mobile and hardware experiences used by millions of people.

We’re looking for an iOS engineer who loves building products and can move quickly through unfamiliar problems. You’ll work closely with product, design, and engineering partners to turn complex financial capabilities into clear, reliable customer experiences.

As a Staff iOS Engineer on Bitcoin, you will own the technical direction and delivery of a critical area of our iOS product experience with bitcoin and stablecoin. This is a hands-on role: you’ll prototype new ideas, make architectural decisions, write production code, and lead work through launch and ongoing improvement.

The work extends beyond the client. You’ll align product requirements with backend capabilities, resolve dependencies with partner teams, and make tradeoffs across customer experience, delivery speed, security, and reliability. You’ll personally tackle the hardest design and implementation problems while helping other engineers contribute effectively.

Your impact will come from shipping valuable products and making the next release better: fewer recurring problems, clearer interfaces, stronger testing, and practices the team can use independently.

• Build products in iOS related to bitcoin, stablecoin and non custodial wallets.
• Work across interfaces in Cash App, Square and Bitkey.
• Own complex features end to end, including client architecture, service integration, testing, rollout, and post-launch improvements.
• Work with product and design to shape customer journeys, prototype new interactions, and turn open questions into delivery plans.
• Build prototypes, reference implementations, and critical paths that prove a direction before broader adoption.
• Contribute bitcoin and stablecoin technology to open source when it creates value for the broader community.
• Influence the technical direction within the product area, making explicit tradeoffs and sequencing dependencies with adjacent teams.
• Improve architecture and shared components where they make product development faster, safer, or more consistent.
• Build automated testing, observability, and safe rollout practices into delivery, with security, privacy, and compliance safeguards appropriate to the risks.

• Integrate AI-assisted development tools into daily workflows to drive leverage across bitcoin engineering.
• Evaluate emerging tools and practices, building durable, AI-powered capabilities where they add clear value.
• Verify AI-assisted outputs and ensure high standards for software quality, security, and reliability.
• Contribute to codebases beyond your iOS specialty.

• Operate beyond your immediate team to identify and address cross-cutting technical problems.
• Lead architecture and design reviews across team boundaries.
• Surface systemic risks before they become customer, seller, or engineering problems.
• Mentor engineers through design discussions, code reviews, and structured guidance that helps them take on greater ownership.
• Help set technical standards that improve the quality and velocity of iOS development over time.

• Partner with engineers, product managers, designers, and engineering leaders to align technical investments with product needs.
• Work with Android, web, and backend engineers to improve shared product foundations and cross-platform experiences.
• Represent bitcoin iOS in cross-team and company-wide technical discussions.
• Communicate complex technical decisions clearly to technical and nontechnical audiences.

• Swift, Objective-C, SwiftUI, and UIKit
• Swift Concurrency and Combine
• Xcode and Instruments
• Bazel and other build and dependency-management systems
• Protocol Buffers and shared client-server interfaces
• Unit, snapshot, integration, and user interface testing
• Performance, observability, and release-safety tooling
• 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.

Block takes a market-based approach to pay, and pay may vary depending on your location. U.S. locations are categorized into one of four zones based on a cost of labor index for that geographic area. The successful candidate’s starting pay will be determined based on job-related skills, experience, qualifications, work location, and market conditions. These ranges may be modified in the future.

To find a location’s zone designation, please refer to this resource. If a location of interest is not listed, please speak with a recruiter for additional information.

Application Guidelines

Candidates may submit up to 9 active applications within a 60-day period. Reapplications to the same role are accepted 90 days after a previous application has been reviewed.

Use of AI in Our Hiring Process

We may use automated AI tools to evaluate job applications for efficiency and consistency. These tools comply with local regulations, including bias audits, and we handle all personal data in accordance with state and local privacy laws.

Contact us here with hiring practice or data usage questions.

Every benefit we offer is designed with one goal: empowering you to do the best work of your career while building the life you want. Remote work, medical insurance, flexible time off, retirement savings plans, and modern family planning are just some of our offering. Check out our other benefits at Block.

Block, Inc. (NYSE: XYZ) builds technology to increase access to the global economy. Each of our brands unlocks different aspects of the economy for more people. Square makes commerce and financial services accessible to sellers. Cash App is the easy way to spend, send, and store money. Afterpay is transforming the way customers manage their spending over time. TIDAL is a music platform that empowers artists to thrive as entrepreneurs. Bitkey is a simple self-custody wallet built for bitcoin. Proto is a suite of bitcoin mining products and services. Together, we’re helping build a financial system that is open to everyone.

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You have:

• 12+ years of professional software engineering experience, including 4+ years building native iOS products.
• Deep experience building, shipping, and maintaining native iOS products using Swift and Apple frameworks.
• Experience creating foundational systems, shared frameworks and tooling used widely on your team.
• A record of leading strategic initiatives with broad adoption and durable impact.
• Strong systems thinking, technical communication, mentoring, and organizational influence.

Ideally, you also have:

• Experience working in large, modular iOS applications, including existing UIKit or Objective-C codebases.
• Experience with build systems, continuous integration and delivery, testing infrastructure, observability, or mobile performance.
• Experience supporting customer-facing or seller-facing products in financial services, commerce, or another high-trust environment.
• Experience with experimentation infrastructure, feature flags, or large-scale product delivery.
• Experience working with bitcoin, stablecoin and non custodial technologies.
• A record of identifying and leading work that was not already on a team's roadmap.