Top Software Engineer Jobs in Toronto

The Senior Software Engineer will lead application development projects, enhance user-facing applications, and implement best software practices while collaborating on product direction.

Build and ship full‑stack, behavior-driven growth experiments and user experiences to increase activation, retention, and expansion. Implement end-to-end A/B tests and feature flags, instrument analytics, analyze results, and collaborate with Product, Design, Marketing, and PLG. May participate in on-call rotation to support production services.

As a Senior Software Developer, collaborate with teams to build scalable systems that improve healthcare outcomes, maintaining quality and fast iteration in development practices.

The Senior Software Engineer II will work on building highly available, secure, and scalable compute layers for Kora, a managed data streaming service, while addressing complex distributed systems challenges.

Design and implement high-performance native Android applications for courier logistics. Own modular architecture, location services, CI/CD, performance tuning, testing, and mentor peers while delivering reliable production releases.

Build and maintain scalable, cloud-native APIs using .NET. Enhance core platform components, lead architecture and testing discussions, optimize telemetry and performance, collaborate cross-functionally, conduct code reviews, and mentor team members.

Design, develop, and optimize data infrastructure, focusing on GCP, ETL/ELT workflows, and data governance, while collaborating with cross-functional teams.

The role involves developing and testing software stacks for networking devices, including embedded firmware and device drivers, for automotive applications.

Lead the Jane Developer Platform team, enhancing extensibility and integrations while fostering AI adoption and strong product focus.

Develop and enhance features for EnrollWise, contribute to a scalable software architecture, review code, collaborate on design and technical feasibility, and maintain software quality.

Develop and maintain backend services and database layers for a Password Safe product using C#/.NET. Design, implement, and review scalable, secure APIs and systems; write and review tests; collaborate with product and cross-functional teams; participate in research spikes and AI-driven design; ensure reliability, performance, and secure coding practices.

Design, build, and operate scalable backend services (primarily Python/Flask) for restaurant partners. Own projects end-to-end, identify high-impact opportunities, collaborate across product/design, ensure quality, monitoring, and performance at scale.

Design, build, and operate identity, authentication, and authorization platforms (user management, authN, authZ) at scale. Partner with security to ensure SOC2/GDPR-compliant, secure-by-design systems. Deliver APIs and self-service tooling (GraphQL/gRPC/REST), improve observability, testing, and reliability, and drive roadmap and execution across time zones.

Lead architecture and delivery of large, distributed telemetry database systems for Grafana Cloud. Own reliability, performance, cost, SLOs/SLIs, incident response, observability, automation, and cross-team alignment while mentoring engineers and driving technical strategy.

Design, build, test, and deploy scalable full‑stack web applications using a Java-based stack. Develop backend services and APIs, create responsive front-end components, optimize database performance, support CI/CD and automated testing, participate in code reviews, and mentor junior developers while collaborating with cross-functional teams.

The role involves testing embedded systems software and desktop applications, defining testing strategies, developing protocols, and ensuring quality adherence in regulated environments.

Lead architecture and evolution of scalable, fault-tolerant backend systems powering real-time AI agents and conversation intelligence. Design data storage and retrieval, partner with ML engineers to operationalize AI, drive production performance, cost efficiency, observability, and mentor senior engineers while owning production reliability.

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.

The role involves leading the design and development of core platform features, building scalable backend services, managing front-end features, and collaborating across teams to enhance the contract lifecycle management software.

Develop AI-powered features, design APIs, integrate AI/ML models, and enhance developer experience for ClickHouse's platform.

The Senior Software Engineer will enhance ClickHouse's cloud platform with Postgres capabilities, managing database clusters and contributing to operational tooling. Responsibilities include backend service design, API development, and collaborating with teams for performance and reliability.

Build and maintain full-stack marketplace features and support ML Ops infrastructure (model deployment, feature stores, real-time pipelines, monitoring) on Chalk and Vertex AI. Collaborate with data scientists to productionize models, write well-tested code, address performance/scalability issues, and contribute to technical planning.

Build and maintain backend and full-stack marketplace features while supporting ML Ops infrastructure (model deployment, feature stores, real-time pipelines, monitoring). Collaborate with data scientists to bring models to production, write well-tested code, address performance and scalability issues, and contribute to technical planning and cross-functional communication.

The Senior Software Developer will design and build fraud detection systems, improve internal tooling, and contribute to AML compliance, while collaborating with product and operations teams.

The Sr. Software Engineer II will design, develop and maintain distributed systems, ensuring scalability, reliability, and performance while leading and mentoring team members.