Senior Android Engineer, App Platform

  • Toronto, Canada
  • Full-time

Company Description

We believe the economy is better when everyone has access. When everyone has room to grow. No one should be left out because the cost is too great or the technology too complex. We started with a little white credit card reader but haven’t stopped there. 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. 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 Android 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:

  • Java and Kotlin for mobile development.

  • Workflow, Dagger, RxJava, Mortar, Flow, Retrofit, and OkHttp mobile libraries.

  • JSON and Protocol Buffers for network transport.

  • Bazel for many of our build environments.

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

  • SQLite, MySQL, and Redis for data persistence.

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. 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.