Top Tech Jobs & Startup Jobs in Toronto

Build and maintain scalable web platform frameworks, tooling, CI/CD, and testing to improve developer productivity and site quality. Lead cross-team initiatives, mentor engineers, set architectural direction, improve performance and accessibility, and use AI thoughtfully to accelerate prototyping, documentation, and testing.

Build and launch user-facing Desktop and Mobile Web features using React/Redux. Own projects end-to-end from prototyping and A/B testing to architecture, scaling, and automated testing. Collaborate with product, design, and backend teams, mentor engineers, lead code reviews, and apply AI thoughtfully to accelerate workflows while validating outputs and protecting sensitive data.

Lead the API engineering team to build and maintain highly available backend services for Pinterest clients. Provide technical direction, architect solutions with stakeholders, manage priorities and delivery, mentor engineers, ensure production readiness, and hire to grow the team.

As a Machine Learning Engineer II, you will build advanced ML models and systems, collaborate with teams, and improve personalized experiences on Pinterest.

Design and deploy large-scale recommender and personalization systems using modern deep learning and ML techniques. Build end-to-end data pipelines and collaborate across product teams to experiment, evaluate, and improve retrieval and ranking models for shopping and other surfaces.

Build and lead development of Pinner-facing iOS features from ideation through release. Collaborate with product, design, and backend teams, prototype and run A/B tests, architect scalable solutions, employ automated testing, and leverage AI to accelerate and improve engineering outputs while ensuring quality and verification of AI-assisted work.

Lead multi-year strategy and roadmap for Pinterest's cross-surface client platform and quality stack (iOS, Android, Web). Own build systems, CI/CD, release tooling, and test infrastructure; drive reliability metrics (CFUR, release health, code coverage, performance/app-size). Define agentic/LLM tooling, lead large migrations, partner across engineering and product, and mentor PM peers.

The Senior Software Engineer will build backend features for user-facing products, lead development processes, and collaborate across teams to enhance Pinterest's services.

Build full‑stack Pinner‑facing features, lead product development from ideation through release, partner with design/product/backend teams, prototype and run A/B tests, employ automated testing, and architect scalable solutions used by millions.

Design, implement, and release scalable iOS features and frameworks working with product, design, and backend teams. Prototype, run A/B tests, apply automated testing, and use AI responsibly to speed workflows while ensuring quality, data protection, and maintainability for millions of users.