Senior Site Reliability Engineer, MacOS CI

  • San Francisco, CA
  • Full-time

Company Description

When we launched the little white reader, we invented mobile, ubiquitous payments and enabled anyone to start, run, and grow a business. Ten years and billions of transactions later we’re reimagining commerce for businesses of all types and sizes—we’re enabling the independent electrician to send invoices, helping the beauty salon pay its employees, and giving the burgeoning coffee chain capital for a second, third, and fourth location. We’re working to find new and better ways to help businesses succeed on their own terms—and we’re looking for people like you to help shape tomorrow at Square.

Job Description

The Mac Compute Team (MCT) provides reliable Mac compute infrastructure and related services to support continuous integration (CI) for Square’s iOS applications.  Providing reliable compute infrastructure covers a broad set of responsibilities including: estimating capacity requirements, coordinating contractors to set up physical machines, installing the latest OS and software, building integration with other Square systems, gathering performance metrics to drive system improvements, and developing disaster recovery (DR) strategies.  MCT is also responsible for evaluating and developing MacOS virtualization strategies to support increased scale while keeping costs under control.

You will use your DevOps skills as part of a small, focused, but critical team responsible for keeping hundreds of Mac Minis and Pros running the latest operating systems, compilers, and related tools; as well as Linux-based Jenkins servers which schedule CI jobs onto those Macs. You will work closely with the iOS MDX (Mobile Developer Experience) team, which has in-depth knowledge of the iOS build pipeline and tools, to understand requirements and support CI infrastructure development efforts.

What will you do:

  • Own (as part of a team) the configuration code; work closely with internal customers to identify requirements and make the necessary changes to configuration code including tests; manage deployment of changes.
  • Gather and analyze system metrics to identify and address problematic machines.
  • Coordinate with vendors to build/upgrade racks to meet demand.  Remove/replace machines after their useful life has ended.
  • Monitor and improve DevOps tools and processes, automate mundane tasks, and improve system reliability by implementing self-healing.
  • Keep CI toolchain up to date and resolve problems as they arise.
  • Evaluate and potentially deploy a distributed artifact storage solution (ie: NAS, SAN) to improve CI throughput by sharing build artifacts.
  • Evaluate and potentially deploy CI services on a cloud provider such as MacStadium.


You have:

  • BA/BS degree or equivalent practical, working experience
  • Working DevOps knowledge including configuration management tools (e.g. Ansible, Chef, Puppet, etc.), and knowledge of MacOS.
  • Experience deploying changes to production environments
  • Ability to work independently to deliver on a schedule without sacrificing quality
  • Good organizational skills
  • Knowledge of iOS build toolchain a plus.

Additional Information

At Square, our purpose is to empower – within and outside of our walls. In order to build the best tools for the businesses and customers we support all over the world, we have to start at home with a workforce as diverse and empowered as our sellers. To this end, we take great care to evaluate all employees and job applicants equally, based on merit, competence, and qualifications. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability status, or any other characteristic protected by law. We encourage candidates from all backgrounds to apply and always consider qualified applicants with arrest and conviction records, in accordance with the San Francisco Fair Chance Ordinance. Applicants in need of special assistance or accommodation during the interview process or in accessing our website may contact us by sending an email to assistance(at) We will treat your request as confidentially as possible. In your email, please include your name and preferred method of contact, and we will respond as soon as possible. Perks At Square, we want you to be well and thrive. Our global benefits package includes: Healthcare coverage, Retirement Plans, Employee Stock Purchase Program, Meal reimbursements, Wellness perks, Paid parental leave, Flexible time off, Learning and Development resources