iOS Software Engineer, Mobile Developer Experience

  • Atlanta, GA, USA
  • Employees can work remotely
  • Full-time

Company Description

Since we first opened our doors in 2009, the world of commerce has evolved immensely – and so has Square. After enabling anyone to take a payment 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, run a busy kitchen, book appointments, engage loyal buyers, and hire and pay staff. And 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 all in one place.

Today, we’re a partner to sellers of all sizes – large, enterprise-scale businesses with complex commerce operations, sellers just starting out, as well as merchants who began selling with Square and have grown larger over time. As our sellers scale, so do our solutions. We all grow together.

There is a massive opportunity in front of us. We’re building a business that is big, meaningful, and lasting. And we are helping sellers around the world do the same.

Job Description

Mobile Developer Experience (MDX) builds all necessary infrastructure and tools to ensure Square's mobile development can continue to be fast and efficient at scale. This is a high force multiplier team aiming to enhance the developer experience for all iOS developers at Square. Our focus is on improving both the local IDE and CI experience when working within our massive and modularized monorepo codebase. We're betting heavily on the future of Bazel. We've already made a 4x improvement on compilation speed and 2x improvement in CI turnaround, but there is still a lot more room for improvement. We do our work in the open, on GitHub, and progress can be seen in the bazel-ios project on GitHub. You'll be part of a team that contributes fixes and improvements to Bazel, maintains Xcode integration, delivers Bazel Remote Execution, and maintains a CDN based remote caching system.

You Will: 

  • Accelerate our delivery of a fast and efficient developer experience with Bazel.
  • Amplify the efficiency of our mobile developers to develop, test, and release apps to our merchants.
  • Identify and fix performance bottlenecks in the development experience
  • Debug and fix issues in large C++ and Java projects like clang, llvm, swift, lldb and Bazel.
  • Help determine the scope and the priorities of the team by identifying opportunities to decrease build times, reduce system complexity, and improve the developer experience.
  • Optimize the performance, and usability of our build tooling.
  • Oversee the success of our team's projects, and achieve quantifiable results.


  • Passionate about accelerating the development velocity of other engineers and improving their developer experience

  • Knowledge of build systems (preferably Bazel/Blaze/Buck)

  • Knowledge of the roles that tools such as xcodebuild, clang, swift, ld, actool, ibtool, and codesign play in the process of generating build/test artifacts

  • Experience supporting build and CI systems infrastructure at scale

  • First hand experience building Apple apps in Swift or Objective-C (preferably both)

  • Excellent software engineering knowledge and the ability to provide technical mentorship and guidance

  • Experience with reverse engineering Xcode, macOS, or iOS software

Technologies we use and teach:

  • Languages: Ruby, Starlark, Typescript, Swift, Objective-C
  • Operating Systems: acOS, Linux

  • Other: AWS, Google Cloud, Kubernetes, Docker

Additional Information

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 a proud equal opportunity employer. We work hard to evaluate all employees and job applicants consistently, without regard to race, color, religion, gender, national origin, age, disability, pregnancy, gender expression or identity, sexual orientation, citizenship, or any other legally protected class. 

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

Additionally, we consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis.


We want you to be well and thrive. Our global benefits package includes:

  • Healthcare coverage
  • Retirement Plans
  • Employee Stock Purchase Program
  • Wellness perks
  • Paid parental leave
  • Paid time off
  • Learning and Development resources

Block, Inc. (NYSE: SQ) is a global technology company with a focus on financial services. Made up of Square, Cash App, Spiral, TIDAL, and TBD, we build tools to help more people access the economy. Square helps sellers run and grow their businesses with its integrated ecosystem of commerce solutions, business software, and banking services. With Cash App, anyone can easily send, spend, or invest their money in stocks or Bitcoin. Spiral (formerly Square Crypto) builds and funds free, open-source Bitcoin projects. Artists use TIDAL to help them succeed as entrepreneurs and connect more deeply with fans. TBD is building an open developer platform to make it easier to access Bitcoin and other blockchain technologies without having to go through an institution.

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