Top Software Engineer Jobs in Toronto

Leads the design and delivery of scalable cloud-native platform capabilities and AI-enhanced applications. Oversees the full software development lifecycle across distributed systems, ensuring availability, reliability, fault tolerance, and performance. Provides technical leadership and mentorship, establishes engineering standards, collaborates with stakeholders on technical requirements and success metrics, and drives architectural documentation, continuous improvement, and operational excellence.

Build and maintain backend microservices in Golang for authentication and authorization. Design scalable APIs, deploy services on AWS and Kubernetes, implement secure high-volume access control, write tests, participate in on-call rotation, collaborate on design and reviews, and monitor and optimize performance and reliability.

Develop backend systems for 3D AutoReview, including geometry parsing, model analysis, quality detection, rule systems, scalable APIs, and AI-assisted review workflows. Collaborate with backend, frontend, product, and machine learning teams to deliver production features. Build extensible systems for custom 3D rules and reference data while experimenting with CAD, machine learning, and large language model technologies.

Lead backend architecture and development across the full SDLC for Capital One's travel platform. Own technical design, build fault-tolerant systems, improve developer experience, establish engineering best practices, and mentor junior engineers while collaborating with cross-functional stakeholders.

Lead backend development for Capital One's travel portal across the SDLC. Own technical design and architecture for fault-tolerant, cross-platform systems, improve developer experience and internal tools, establish engineering best practices, and mentor junior and intermediate engineers while collaborating with technical and business stakeholders.

Build and own technically complex, end-to-end full-stack features and platform capabilities for AI-driven IoT products. Define technical strategy, ship backend/frontend/mobile work, scale data ingestion and APIs, partner with product/design/customer teams, mentor engineers, and drive cross-team projects from ambiguous problems to measurable outcomes.

Lead technical strategy and execution for the shared mobile app infrastructure, build and maintain React Native and native modules, improve observability, CI/CD, releases and developer tooling, define standards and runbooks, mentor engineers, coordinate cross-functional trade-offs, and ensure production availability and quality across mobile products.

Build and maintain platform and infrastructure for quantum hardware development: design APIs and internal tooling, manage AWS-backed data infrastructure, implement CI/CD and containerized deployments, collaborate with hardware researchers, and perform DevOps tasks across multiple repositories.

As a Full-Stack Software Engineer, you will build end-to-end features, develop backend services, and create frontend applications while using AI-assisted tools and collaborating with teams.

Design, build, test, and maintain Magnet One cloud platform features across front-end and back-end. Collaborate on architecture, perform code reviews, troubleshoot defects, and drive best practices for secure, performant, and maintainable software.

Lead technical strategy and execution for a backend ledger team building audit-grade, highly available financial systems. Drive architecture, operational reliability, monitoring, code quality, mentorship, and cross-functional collaboration to deliver accurate, scalable ledger and accounting functionality.

Work embedded with strategic customers to design and build end-to-end integrations and solutions using ElevenLabs technologies. Own major projects, collaborate with customer engineers and executives, and solve complex technical problems with strong coding, architecture, and communication skills.

Build and evolve scalable observability systems: high-throughput telemetry ingest, cost-efficient storage, instrumentation libraries, SLO/alerting infrastructure, and integrations to improve reliability, diagnostics, and incident response across multi-cloud infrastructure.

Design, build, test, and deploy full-stack applications using React/Next.js and Kotlin. Collaborate on architecture, contribute to component libraries, perform code reviews, mentor peers, troubleshoot production, and integrate AI-assisted tools and APIs.

As a Software Engineer in AI Infrastructure, you will design and develop core platform components, build APIs and services, enhance performance, and automate tooling while collaborating across teams and improving system reliability.

Develop and maintain infrastructure for software development and AI operations, manage CI/CD pipelines, and automate configurations using various tools.

Build and maintain backend APIs and data pipelines that ingest and process large-scale construction data (360° video, schedules, IoT). Optimize storage and query performance using DuckDB and PostgreSQL, extend Airflow workflows, integrate Wasm for local computation, monitor data quality, and collaborate with frontend, CV, and ML teams to deploy production models and analytics.

Design, develop, and implement AI-enabled solutions to automate and accelerate the software delivery lifecycle. Build AI agents and workflows using tools like Claude Code and Copilot, improve developer productivity, support production applications, troubleshoot incidents, and evolve SDLC into AI-driven ADLC while collaborating with stakeholders across delivery teams.

Design, implement, and maintain automated test frameworks and E2E/integration tests for a distributed enterprise application. Perform system, load/performance testing, collaborate with developers and product owners, participate in CI/CD and release activities, and improve test automation reliability and maintainability.

Design, develop, and maintain MSSQL databases, RESTful APIs, C#/.NET Core backend services, and Angular front-end applications. Collaborate with cross-functional teams, troubleshoot and optimize performance, participate in code reviews, and adopt AI-enabled tools to improve workflows. Remote role with ~10% travel and requirement for valid passport.

Join the Blocks team to develop and maintain the backend core infrastructure of Pigment's SaaS platform, ensuring scalability and performance. Collaborate with multiple teams to deliver impactful solutions.

The Associate Software Engineer will develop, enhance, and support web applications using .NET technologies, collaborating in an Agile environment.

Design, develop, debug, and test cloud-connected firmware features (C/C++ and Go). Support and scale IoT device fleet, build observability and rollout metrics, triage customer/QA issues, and collaborate cross-functionally to deliver production-ready firmware.

Lead cross-organizational technical strategy and execution for core sharing and collaboration systems. Architect and implement foundational frontend/backend and platform solutions at massive scale, drive AI/LLM adoption, mentor engineering leaders, resolve systemic bottlenecks, and remain hands-on in critical design, prototyping, and code contributions.

As a Senior Software Engineer on the Cash App Banking team, you will lead the design, execution, and delivery of banking features, collaborating across teams to enhance the user experience.