Top Software Engineer Jobs in Toronto

Design, develop, and maintain embedded firmware for optical networking products. Implement new features, resolve legacy bugs, collaborate with hardware, validation, and test teams, and ensure accurate firmware documentation. Coach junior engineers, lead code reviews, support pre/post sales and field engineers, and apply Agile/CI/CD/DevOps practices for product delivery.

Design and build scalable, shared platform systems and libraries used across product teams. Partner with product teams to define clean APIs, drive architecture and engineering standards, participate in code reviews and design discussions, document systems, and improve developer experience and platform reliability.

Design, build, and maintain ClearCheck .NET/WPF desktop software for radiotherapy plan checking. Implement DICOM integration, 3D image/dose/plan visualization and DVH evaluation, collaborate with physicists to translate clinical requirements, contribute to architecture, testing and code reviews, and mentor teammates to deliver performant, reliable medical imaging solutions.

Design, build, and operate a cloud-native data platform and ML infrastructure at scale. Own end-to-end pipelines from CDC to feature stores, model training/serving, monitoring, and data product SLAs. Apply distributed systems and MLOps practices, leverage LLMs/agentic systems, and translate technical issues to business impact.

Lead test strategy and design, build and maintain automated test suites for enterprise regulated software, troubleshoot failures using SQL and logs, test across platforms including mobile, and mentor junior QA while integrating automation into DevOps workflows.

As a Senior Developer, you'll design, develop, and maintain software systems, mentor juniors, ensure code quality, and collaborate with teams for scalable solutions.

Lead architecture and development of an internal agentic AI research platform and automation systems. Build scalable, reliable pipelines, SDKs, APIs, and developer-facing tools; enforce engineering standards, mentor engineers, and partner with researchers to translate needs into production-ready developer tools and services.

Design and implement scalable ETL/data pipelines using Python and Airflow; collaborate with technical and non-technical stakeholders to define requirements; build internal tools; mentor and lead small engineering pods; ensure reliable integration architecture and database schema/performance optimization; explore and apply AI technologies to enhance the platform.

As a Senior Software Engineer, you will lead team initiatives, enhance mobile app performance, mentor junior members, and ensure quality in software delivery.

Design, architect, and ship full‑stack monetization and ad-creation UI features. Build scalable React/TypeScript frontends, integrate with GraphQL/REST backends, run prototypes/A-B tests, ensure automated testing and code quality, and collaborate with product, design, and backend teams.

Design and develop platform capabilities, optimize performance, and improve deployment processes. Collaborate on engineering quality and foster an innovative culture.

As a Staff Frontend Software Engineer, you'll develop critical infrastructure and user-facing features for a secure AI platform targeted at legal firms, collaborating across teams to ensure reliability and innovative solutions.

Lead frontend engineering to build polished, high-performance React+TypeScript interfaces for enterprise AI collaboration. Own end-to-end UI features, design system components, optimize performance, and collaborate with design and backend teams to deliver secure, reliable experiences for lawyers and organizations.

Design and build foundational backend infrastructure (authentication, permissions, feature flags, notifications, document integrations), evolve an internal product platform, lead enterprise-facing features for multi-party collaboration, and ensure security, privacy, and reliability for sensitive legal data while collaborating cross-functionally.

As a Staff Backend Software Engineer, you'll design and build backend infrastructure, lead development of enterprise features, and ensure system reliability processes for Harvey's AI-powered tools.

The Senior Software Engineer will lead the technical roadmap for AI initiatives, architect LLM systems, and mentor engineers while collaborating with product teams to design technical solutions.

Design, develop, and maintain scalable backend services for eBay's authentication platform. Lead architecture for distributed systems, build REST/GraphQL APIs, deploy on GCP, improve reliability and observability, troubleshoot production incidents, and mentor engineers while driving DevOps and IaC practices.

Design, build, and deploy complex distributed microservices and cloud-based systems. Implement RESTful APIs, third-party integrations using SDKs, and manage package release cycles (CI/CD). Work with AWS/GCP, NoSQL (MongoDB/Elasticsearch) and SQL databases while providing technical leadership and strong cross-team communication.

The Software Engineer will develop Link's investment analytics platform, design application infrastructure, and work directly with business teams on solutions and feedback.

Design and deliver full-stack features across notebook services, container runtimes, and UI (Go/Python backend, TypeScript/React frontend). Own medium-to-large projects end-to-end, improve runtime management, reproducibility, security/compliance, and observability, ensure reliability in regulated or air-gapped environments, participate in on-call rotation, and mentor junior engineers.

Define, implement, execute and maintain test plans and cases for ADAS controllers. Automate tests, develop and troubleshoot HIL bench tests, use Python and CAN/Ethernet tools (INCA, CANoe, CANalyzer, VSpy), produce reports, and apply calibration/validation and AI tools to improve test coverage and productivity.

The Senior Software Engineer will design and develop AI-powered tools to automate quality assurance processes, improve developer workflows, and enhance testing efficiency, directly impacting developer productivity and satisfaction.

Lead end-to-end design and implementation of Diagnostics backend: high-throughput Go services, ingestion and OpenTelemetry pipelines, ClickHouse-based storage and queries, and dashboard surfaces. Collaborate cross-team, mentor engineers, raise code-review and AI-agent workflow standards, and ensure reliability, performance, and secure data handling.

Lead a small engineering team to deliver and operate large-scale Roblox game features. Drive technical planning, estimation, code quality, monitoring, releases, and mentorship while partnering cross-functionally to improve performance and player experience.

Design and build scalable, high-performance full-stack web applications using a Java-based stack. Develop backend services and RESTful APIs, create responsive front-end components, optimize database performance, support CI/CD and automated testing, participate in code reviews, and mentor junior developers.