Top Tech Jobs & Startup Jobs in Toronto

Lead backend development and own services end-to-end: design, deploy, operate, monitor, and troubleshoot production systems. Collaborate with frontend, CloudEng, product, and design teams; participate in on-call rotations, code reviews, security/privacy reviews, and mentoring. Use observability tooling and cloud infrastructure to maintain reliability and ship high-quality features.

Lead and mentor a software engineering team building privacy-respecting Ads (Firefox Suggest) backend services, partner integrations, experimentation, and product-facing systems. Partner with Product, Data, Privacy, and Revenue stakeholders to deliver reliable, maintainable production software, hire and onboard engineers, and foster an inclusive, distributed team culture while balancing privacy, policy, and business constraints.

Build and own backend services end-to-end: design, implement, deploy, operate, and monitor production systems. Collaborate with frontend, CloudEng, product, and design; participate in on-call rotations, incident response, security/privacy reviews, code reviews, and mentor junior engineers while improving reliability and cloud infrastructure.

Build, maintain, and evolve Mozilla’s Internal Developer Infrastructure Platform: CI/CD, observability, Kubernetes optimization, environment bootstrapping, and cost optimization. Lead technical decisions, create Claude skills and agentic workflows to boost developer productivity, mentor teammates, write proposals, and deliver cross-functional platform features while ensuring usability, maintainability, and safe production paths.

Lead hands-on engineering execution and people management for Thunderbolt, defining production readiness, release discipline, and engineering practices for an enterprise-ready open-source AI product across desktop, web, and mobile.

Design, build, and operate AI platform services for model training and inference at scale. Own reliability, Kubernetes/GKE deployments, GitOps pipelines, Terraform provisioning, observability, packaging and deployment automation, and incident response while collaborating with product, infrastructure, security, and data teams.

Execute digital marketing activities to grow Thunderbird's brand and users: create and publish social, blog, and email content; manage campaign calendars; track and report metrics; support email automation, surveys, and cross-functional campaign execution; and ensure consistent brand messaging.

The Staff Data Scientist will own the analytical strategy for Firefox, driving data-informed decisions through measurement frameworks, experiments, and user growth analysis, while mentoring other data scientists.

The Staff Data Scientist will lead analytical strategies for Firefox, focusing on product growth, measurement frameworks, and mentoring data scientists while guiding data-driven decisions.

Work on Firefox's accessibility engine (Gecko) to improve architecture, stability, performance, and platform integration. Debug multi-process, multi-threaded and OS-specific issues, build tests and prototypes, collaborate with cross-functional teams, influence web accessibility standards, and engage with the open-source community to make web content accessible to all users.