Top Software Engineer Jobs in Toronto

The Staff Software Engineer will design, develop, and deliver cloud-native Android security products, collaborating with various teams to ensure high-quality solutions and foster a culture of excellence and continual improvement.

Design, develop, and maintain large-scale Java-based microservices and APIs. Mentor junior engineers, lead small projects, perform advanced debugging/refactoring, ensure API security and quality, and collaborate with product and analytics.

Build backend infrastructure and APIs to integrate Lyft with emerging AI ecosystems and devices. Design scalable distributed systems, mentor engineers, drive high-impact projects, write and review maintainable code, participate in on-call rotation, and collaborate cross-functionally to deliver production-grade AI-enabled features.

Build and scale developer infrastructure: manage monorepo builds with Bazel, operate remote build execution clusters, scale CI pipelines, manage GitHub configurations and tests, and provide remote development environments to improve onboarding and developer productivity.

Lead end-to-end AI product development: design, build, deploy, and iterate AI-native features (agents, RAG, tool-use). Own full stack (frontend, backend, data, model integration), establish feedback loops (evals, telemetry), partner with product and operations, and make pragmatic build-vs-buy decisions to deliver production-quality AI features for restaurant operations.

Lead design and evolution of large-scale, distributed systems; drive AI-assisted development adoption; define technical vision; mentor engineers; improve observability, reliability, testing, security, and developer productivity across teams.

Join Hive to build and improve a marketing platform, focus on developing and shipping software, optimize system performance, and collaborate with teams.

Design and implement carrier-grade embedded real-time firmware for optical line systems. Collaborate with hardware/FPGA and optical engineers to develop low-level device drivers, control algorithms on Linux/FreeRTOS, and gRPC-based interfaces. Provide design estimates, follow development processes, and sustain legacy products while supporting new product development.

Principal IC responsible for reliability, observability, and modernization of a .NET-based Platform Services portfolio on Azure. Own architecture, resilience patterns, shared libraries, and migration of legacy .NET services. Implement observability, event-driven messaging, and AI-first engineering practices while mentoring engineers and partnering with architecture teams.

Build and operate large-scale, high-performance infrastructure to run AI inference and agents on real-time streaming data. Design scalable, reliable serving layers, solve distributed-systems challenges, and optimize across cloud providers.

Design and maintain modern Angular/TypeScript front-end applications, build reusable UI components, integrate with C#/.NET microservices, optimize performance and accessibility, contribute to CI/CD and automated testing, mentor peers, and collaborate cross-functionally in Agile/SAFe teams.

The Senior Frontend Engineer will develop and improve the Cresta platform, focusing on frontend engineering, coding, architecture, and customer-facing components, while ensuring high standards in performance and security.

Lead technical triage and resolution for full‑stack production issues, build internal tools and automations, expand observability, harden CI/CD and deployments, and partner with implementation and product teams to streamline customer rollouts and influence product roadmap around AI, cloud, and platform reliability.

Join an early engineering hire at a growing SaaS platform for online communities. Scope and deliver new features, write modular TypeScript/React code, enable AI coding agents, monitor production, and troubleshoot issues while influencing product direction and improving platform scalability and developer experience.

As a Senior Software Developer, you will architect and develop robust software solutions, enhance software stability, manage tech debt, and collaborate with teams while staying updated on new technologies.

The Principal Software Engineer will lead technical initiatives across teams, enhancing engineering effectiveness and ensuring high-quality systems, while mentoring senior engineers.

Lead the quality engineering efforts for Replicant's AI platform by defining standards, improving testing strategies, and mentoring a QA team to ensure high-quality outputs across software systems.

As a Frontend Leaning Full Stack Engineer, you will improve internal software, enhance user-facing tools, and shape UX/UI for founders and investors, focusing on efficiency and product ownership.

As a Senior Software Engineer, you will lead your team in delivering features according to specifications, ensuring scalable technical decisions, and mentoring team members.

Design and evolve systems for Motion's infrastructure, focusing on reliable and secure operations across APIs, Linux systems, and cloud environments with a focus on hands-on coding and engineering judgment.

Build and operate high-throughput experimentation and recommendation infrastructure. Design APIs and services, use agentic AI workflows (LLMs) for development, ensure performance and reliability, participate in on-call, mentor teammates, and codify AI-native engineering practices.

As a Fullstack Software Engineer, you will develop products for the post-purchase experience by implementing features, maintaining code quality, and mentoring other engineers.

Design and implement SDN-based network architecture for a multi-orbit satellite constellation. Develop routing, topology management, fast-reroute, traffic engineering, telemetry/observability, and self-healing control-plane/data-plane solutions optimized for latency, power, and mobility. Collaborate with RF and silicon teams and mentor junior engineers.

Design and implement SDN and routing solutions for a multi-orbit satellite constellation: routing, topology management, fast-reroute, telemetry-driven self-healing, packet forwarding, and observability. Collaborate with RF and silicon teams and mentor junior engineers.

Design, implement, and test MAC control-plane software for satellite links, including TDMA/DAMA scheduling, QoS, link-state machines, hardware integration (PHY, FPGAs, modems), and simulation/testing to validate performance under mobility and failure scenarios.