Software Engineer (Ruby), Mobile Performance & Reliability

  • Toronto, ON, Canada
  • Employees can work remotely
  • Full-time

Company Description

Since we opened our doors in 2009, the world of commerce has evolved immensely, and so has Square. After enabling anyone to take payments and never miss a sale, we saw sellers stymied by disparate, outmoded products and tools that wouldn’t work together.

To solve this problem, we expanded into software and built integrated solutions to help sellers sell online, manage inventory, book appointments, engage loyal buyers, and hire and pay staff. 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 in one place. Afterpay furthers our goal to provide omnichannel tools that unlock meaningful value and growth, enabling sellers to capture the next generation shopper, increase order sizes, and compete at a larger scale.

Today, we are a partner to sellers of all sizes – large, enterprise-scale businesses with complex operations, sellers just starting, as well as merchants who began selling with Square and have grown larger over time. As our sellers grow, so do our solutions. There is a massive opportunity in front of us. We’re building a significant, meaningful, and lasting business, and we are helping sellers worldwide do the same.

Job Description

Square's mobile applications continue to rapidly scale and diversify as each new opportunity is tackled by teams of passionate engineers. Mobile Performance & Reliability endeavors to amplify the efficiency of developing, building, testing, and releasing high-quality mobile apps.

Within Mobile Performance & Reliability, you will join a team focused on mobile performance, reliability, and observability. We instrument mobile applications to collect performance metrics, debug logs, analytics, & crash reports. As a software engineer (Ruby), you'll deliver full-stack systems that enable engineering, product, and leadership to measure and assess the impact of their work on our customers's experience.

Our team reports to the Developer Empowerment organization which ensures software development at Square is not only fast and efficient, but delightful.

You Will: 

  • Translate functional and technical requirements into detailed architecture and design
  • Operate and enhance highly scalable microservices consumed by millions of devices across several international markets
  • Collaborate with multiple stakeholders across the company including product, design, legal, support, and other engineering teams
  • Provide design reviews for engineering teams across Square working with our frameworks


  • An eagerness to share your ideas, and openness to those of others.
  • Demonstrated collaboration with co-workers on cross-functional teams and in other locations
  • Demonstrated experience mentoring engineers.
  • Strong familiarity with Ruby and/or Rails.
  • 5+ years of professional software development experience

Technologies we use and teach: 

  • Java, Ruby, Go

  • gRPC, Protocol Buffers, JSON

  • MySQL, DynamoDB, Redis

  • Kubernetes, YAML, Terraform

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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