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Smile.io Logo Smile.io · IT - Software Development

Senior Software Engineer - APIs, Integrations, and External Developer Tooling

Canada 155000.00 - 165000.00 CAD / Year · Job Posted February 14, 2026
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Job Description

At Smile.io, we help brands build loyalty programs that turn customers into lifelong fans. Behind that mission is a growing ecosystem of developers, agencies, and partners building on top of Smile — and the Solutions Squad exists to make that experience exceptional. We’re looking for a fully remote Senior Software Engineer to join our small, highly autonomous team and help us build a world-class platform for developers integrating with Smile.

Job Responsibility

  • Designing, building, and evolving public APIs used by external developers and partners
  • Improving the security, consistency, and usability of Smile’s API surface
  • Building and maintaining Ruby on Rails services that power integrations and developer tooling
  • Developing and evolving Smile’s JavaScript SDKs and frontend libraries
  • Crafting thoughtful developer experiences — from API ergonomics to documentation
  • Iterating on existing and building new in-house integrations
  • Partnering with internal teams to help solve for novel merchant use cases
  • Championing technical discussions, decisions, and trade-offs
  • Identifying opportunities to raise the bar in areas like architecture, performance, and security
  • Sharing context, feedback, and knowledge within and across teams

Requirements

  • Experience with Ruby on Rails in a professional settings for at least 5 years
  • Experience designing, consuming, or evolving APIs
  • Be comfortable working across the stack, with experience in React and TypeScript
  • Experience using AI tools to solve real-world engineering problems
  • Be based in Canada and able to work hours that significantly overlap with 9 AM - 3 PM PT

Nice to have

  • Knowledge of API design and API security best practices
  • Experience building or using developer tooling (APIs, SDKs, SDKs, CLIs)
  • Experience interfacing with external developers or partners

What we offer

  • flexible vacation
  • a remote work allowance
  • a monthly credit to use at any of the store 100,000+ stores that uses our software
Smile.io - All Job Offers

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