Top Software Engineer Jobs in Toronto

Work across the full stack to build and maintain features for Toast's restaurant platform, including Android (Kotlin), backend services (Kotlin/Java), and frontend SPAs (React/TypeScript). Write automated tests, participate in code reviews, collaborate with product and QA, complete onboarding codelabs, and learn CI/CD and feature flag management (LaunchDarkly). Use AI-assisted tools to improve development workflows and deliver reliable, production-ready software.

Contribute to modernization and technical-debt reduction efforts, implement and test features, participate in code reviews, follow CI/CD and Agile practices, and collaborate with senior engineers while learning cloud and security practices.

As a Software Engineer at Opendoor, you will build crucial production systems, own features from design to deployment, and mentor teammates while leveraging AI tools.

Design, implement, and maintain backend software for Atlas Search, focusing on scalability and system architecture improvements while collaborating with a team.

Build and operate ML training and serving infrastructure: design, develop, and launch backend systems, support availability and on-call, collaborate cross-functionally, and improve developer velocity.

Build and evolve core AI platform capabilities: design shared execution patterns, APIs, and backend services to support multi-step GenAI workflows, model integrations, and scalable production systems. Collaborate with AI engineers, data scientists, and product partners to turn emerging AI use cases into reliable, extensible platform features.

The Software Engineer will enhance Lending products for Cash App, focusing on building complex systems, APIs, and collaborating with multiple teams to support economic empowerment through accessible credit.

As a Software Engineer, you will design and build backend services and integrations for financial operations, focusing on scalable technology solutions and AI enablement, while collaborating with cross-functional teams to ensure compliance and data integrity.

Build and maintain scalable integration and end-to-end test automation frameworks and CI pipelines. Optimize test execution, improve stability and reporting, support engineering teams with triage and best practices, write technical specs/ADRs, participate in on-call rotation, and collaborate across regions to evolve the companys test strategy and developer productivity tooling.

Build end-to-end full-stack AI features on a Ruby on Rails backend and React frontend, design and run experiments (A/B tests and AI evaluations), implement AI infrastructure for reliable LLM inference, and iterate quickly to scale production-ready LLM-powered products.

The Software Engineer II will ship features to enhance Affirm's marketplace, supporting product development and collaborating with design and analytics teams while ensuring operational stability.

As a Staff Fullstack Software Engineer, you'll optimize user monetization systems at Dropbox, leading technical strategies for checkout and subscriptions while mentoring engineers.

Design, develop, and maintain a cross-platform, high-performance graphics rendering engine for Bitmoji. Build artist tools, profile and optimize performance, perform code reviews, evaluate technical tradeoffs, and deliver scalable, production-quality graphics features for millions of users.

As a Software Engineer in Tools & Services, you will design testing frameworks, contribute to code quality, and work with a dynamic team on high-quality software solutions.

As a Software Engineer II, you'll implement critical features, collaborate with teams, maintain full stack systems, and ensure high-quality code in a dynamic environment.

You will design, develop, and launch backend systems, APIs, and collaborate with cross-functional teams to support product development and operations.

Lead development of iOS features using Swift and SwiftUI with reactive programming. Collaborate with engineers, UX, and product to deliver high-quality mobile experiences, mentor junior engineers, own major components, review code, promote best practices, and engage across platforms (Android, APIs, Web).

The Senior Infrastructure Software Engineer will build and manage a scalable, in-house search platform, ensuring seamless user experiences and expanding capabilities for a global user base.

Design, build, and operate large-scale distributed storage systems ensuring durability, availability, and performance. Implement replication, erasure coding, and lifecycle management; write high-quality Go and Rust code; participate in on-call rotations; troubleshoot production issues; collaborate across networking, hardware, and capacity teams; own scoped projects and drive infrastructure architecture and reliability improvements.

Develop software solutions as part of Agile teams, focusing on user experience, CI/CD pipelines, and maintaining software quality. Engage in continuous learning and collaboration.

The Senior Infrastructure Software Engineer will re-architect Identity systems, focusing on large-scale distributed systems design, API design, and collaborate with teams to implement wide-ranging use cases while mentoring junior engineers.

Build and maintain backend systems for money movement and card ledger features. Design, develop, and launch scalable APIs and services (Python or Kotlin) using AWS, MySQL, and Kubernetes. Collaborate with product, design, data science, and cross-functional teams, support operations and on-call, create and monitor metrics, participate in code reviews and hiring, and deliver well-tested, extensible solutions.

Lead full-stack design and development for Capital One's travel platform, owning architecture, implementing front-end and back-end features, improving engineering tools and practices, mentoring junior engineers, and integrating with partners like Brex while leveraging cloud services and databases.

The role involves designing and expanding the platform's backend to enhance merchant lifecycle orchestration, executing technical strategy, and improving engineering standards.

The Staff Software Engineer will own user-facing product areas, lead initiatives across frontend and backend, and mentor team members to enhance product quality and engineering standards.