Senior iOS Engineer, App Platform

  • Toronto, ON, Canada
  • Full-time
  • Current Square Employee?: Apply via go/jobs

Company Description

We believe everyone should be able to participate and thrive in the economy. So we’re building tools that make commerce easier and more accessible to all. We started with a little white credit card reader but haven’t stopped there. Our new reader helps our sellers accept chip cards and NFC payments, and our Cash app lets people pay each other back instantly. We’re empowering the independent electrician to send invoices, setting up the favorite food truck with a delivery option, helping the ice cream shop pay its employees, and giving the burgeoning coffee chain capital for a second, third, and fourth location. Let’s shorten the distance between having an idea and making a living from it. We’re here to help sellers of all sizes start, run, and grow their business—and helping them grow their business is good business for everyone.

Job Description

Square’s mobile applications continue to rapidly scale and diversify as each new opportunity is tackled by teams of passionate engineers. App Platform endeavors to amplify the efficiency of developing, building, testing, and releasing high quality mobile apps.

Our team’s mission includes building services and frameworks for connecting mobile applications to Square’s core services. Together we’ll focus on designing scalable solutions for push notifications, A/B testing, feature flags, synchronizing configuration, mobile networking, performance, and reliability.

We are seeking individuals with prior mobile development experience to deliver full-stack, end-to-end solutions which solve complex challenges faced by multiple teams at Square. You will ship open source libraries, mobile frameworks, micro-services, and data pipelines while working amongst team members possessing a diverse set of skills and experience.

Are you interested in helping us grow in Toronto? You will collaborate with us to expand our existing team, based out of San Francisco and Toronto, and grow Square’s engineering presence in the city.


You will:

  • Foster a strong culture with team members in both Toronto and San Francisco.

  • Collaborate with colleagues across engineering, product, design and operations to deliver end-to-end solutions.

  • Design high availability, resilient systems which can operate no matter the network or device conditions.

  • Capture and analyze metrics to drive informed decisions.

  • Contribute to the direction of the team and selection of projects on our roadmap.

You have:

  • At least 5 years of relevant industry experience developing iOS applications.

  • Interest in working full-stack, from mobile application libraries to backend web services.

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

  • An eagerness to share your ideas, and openness to those of others.

  • BA/BS degree or equivalent working experience.

Technologies we use and teach:

  • Objective-C and Swift for mobile development.

  • JSON and Protocol Buffers for network transport.

  • Java, Guice, Envoy, gRPC, Jersey, and OkHttp for server development.

  • SQLite, MySQL, and Redis for data persistence.

Additional Information

At Square, we value diversity and always treat all employees and job applicants based on merit, qualifications, competence, and talent. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. We will consider for employment qualified applicants with criminal histories in a manner consistent with the requirements of the San Francisco Fair Chance Ordinance.