Top Software Engineer Jobs in Toronto

Lead quality strategy and test automation for personalization, recommendation, experimentation and consumer intelligence. Build and maintain automated test frameworks (API, integration, contract, E2E), integrate quality into CI/CD, validate ML-driven outputs and consumer journeys, manage test data/environments, and coach engineers to improve release reliability and engineering quality.

Design, build, and maintain production-grade microservices and web applications to power personalization and recommendations. Implement model-serving and inference integrations, ensure resiliency, observability, and low-latency performance, work with event-driven and caching patterns, collaborate with AI/ML and data teams, drive technical designs, mentor engineers, and operationalize services for production readiness.

Lead-platform principal engineer who codes, debugs, and sets reference implementations across AI-powered CX systems. Own platform architecture decisions, unblock squads by shipping production code, mentor engineers, and build high-capacity, event-driven distributed systems integrating messaging, multiple DB types, multi-cloud, and advanced AI (LLMs, RAG, agents).

Design, build, and ship production-grade distributed features within cross-functional agile teams. Contribute to architecture, prototype solutions, write automated tests, debug and profile distributed systems, resolve defects, coordinate technical dependencies, perform code reviews, and share knowledge to improve product quality and team practices.

Design, build, and maintain modular .NET features for an FP&A platform. Implement data access against Aurora Serverless, build event-driven integrations, apply module-based authorization, write automated unit and integration tests, troubleshoot production issues, participate in code reviews and cross-module architecture, and coordinate technical dependencies in a domain-driven modular-monolith.

Lead a team to design, build, and operate large-scale data pipelines and warehouses, ensure data quality and SLAs, collaborate cross-functionally, leverage AI/LLM, and drive key data initiatives from planning to delivery.

As a Software Engineer for Native Apps, you will drive initiatives across product areas, collaborate with teams, and build scalable features. Deep backend experience is required.

The Software Engineer will build and maintain internal developer tools, optimize CI/CD pipelines, and collaborate across teams to enhance developer experience and infrastructure reliability.

As a Senior Software Engineer, you'll collaborate with teams to build solutions, mentor junior members, ensure code quality, and drive best practices in a supportive environment.

The Sr Platform Engineer will develop and enhance platform services, ensuring reliability and security in healthcare applications while leading technical standards and fostering developer enablement.

As a Staff Software Engineer, you'll build scalable systems for the Tokenization Engine and mentor juniors, collaborating with cross-functional teams to enhance system performance and stability.

Senior full-stack engineer to build customer-facing features across banking, tax automation, and expense tracking. Work across backend APIs, MySQL/Spanner data models and React/TypeScript frontends. Own end-to-end delivery, improve architecture and reliability, mentor engineers, and drive engineering standards and debt reduction.

The Staff Software Engineer will develop and deploy high-performance machine learning systems, optimizing large language models for production environments. Responsibilities include ensuring high availability and low latency for AI applications and working collaboratively across teams.

As a Software Engineer, you'll design and optimize algorithms for real-time sensor data processing, collaborating with a talented team on high-performance solutions for autonomous driving.

Founding engineering member building an AI-driven life-sciences SaaS platform. Own features end-to-end from design to production support, drive technical solutions, enforce best practices, perform expert code reviews, and mentor engineers to grow the team and deliver scalable, high-volume products.

Lead architecture and delivery of scalable SaaS and hardware-integrated security systems. Drive firmware/OS integration, edge processing optimization, AWS-based data ingestion and BI, enforce code quality and security (SOC 2), mentor engineers, and incorporate AI into products.

Build and scale the internal developer platform: create tools, services and automation (CI/CD, canaries, feature flags, access workflows) using IaC (Pulumi/Python) and Kubernetes to enable safe, fast shipping. Drive platform initiatives, mentor teams, lead AI tool adoption for engineering, participate in on-call and design/code reviews, and ship major improvements across the organization.

Own design, implementation, and production support of Windows kernel-mode enforcement drivers (filesystem, process/thread, handles, registry) and the kernel/user-mode enforcement boundary. Reduce enforcement latency at scale, extend enforcement to containers and isolation, ensure compatibility across Windows builds, handle driver signing and deployment, collaborate cross-platform on policy and the Rust userspace agent, and mentor engineers while driving technical direction and operational stability.

Contribute to the development of Waabi World, improve simulation scalability, and design orchestration software for autonomous vehicle simulations.

Design, scale, and performance-tune GraphQL APIs, gRPC services, and SQL queries for iCasino features. Own complex technical problems, build end-to-end integrations with game providers, improve production scalability, set up DataDog monitoring, participate in on-call rotations, and mentor other engineers.

Lead design and implementation of scalable APIs and agent communication layers for an AI-agent driven advertising marketplace. Build high-throughput backend systems, integrate agent frameworks and adtech partners, drive architecture for authentication and protocols, mentor engineers, and prototype agent communication patterns while collaborating with product and design.

Design, implement, and optimize Elasticsearch core storage and query engine components for logs/metrics workloads. Lead architecture, resolve performance bottlenecks, improve storage efficiency and query execution, mentor engineers, collaborate across distributed teams, triage community issues, and write idiomatic modern Java.

Drive architecture and design of Elasticsearch core storage and query engine for logs and metrics. Improve storage efficiency, indexing layouts, serialization, and performance; lead cross-team initiatives; mentor engineers; triage community issues; and write idiomatic modern Java.

Lead design and delivery of the Structured Record Storage platform: CDC/Kafka integration, schema automation, access APIs, and fleet management. Set architecture standards, improve fleet-wide operations (capacity, monitoring, tuning, replication), drive migrations and schema lifecycle, enforce observability and IaC, mentor engineers, coordinate cross-team tradeoffs, and own reliability and incident response.

Design, develop, and maintain complex software applications while leading technical architecture and collaborating with teams. Write maintainable code and participate in code reviews.