Top Software Engineer Jobs in Toronto

As a Senior Software Engineer, you'll lead the design and development of web applications, mentor peers, and ensure high-quality, secure code using Ruby on Rails, GraphQL, and React.

Develop software and systems for embedded platforms at Aquabyte, focusing on sensor interfaces, network reliability, and hardware diagnostics while collaborating with research teams on machine learning models.

Design, develop, and optimize Acumatica ERP customizations, workflows, integrations, and reporting for financial services. Lead integrations with payment gateways and third-party financial tools, enforce Acumatica best practices, support UI/UX enhancements, and ensure upgrade-safe customizations while collaborating with cross-functional teams.

As a Sr. Software Engineer, you'll design and develop features for a SaaS platform, collaborate with teams, tackle technical problems, and ensure high-quality solutions with an ownership mindset.

Seeking a Senior Software Engineer to design and build a microservices-based SaaS platform, focusing on Java and AWS technologies while ensuring robust deployment and customer satisfaction.

As a Staff Software Engineer at Juniper Square, you'll lead architectural decisions and develop AI-powered systems, mentoring engineers and ensuring high-quality technical standards while collaborating with cross-functional teams.

Lead architecture and roadmap for Twilio's Compliance Experiences platform, modernizing legacy systems into cloud-native microservices. Drive AI-augmented development, design high-availability APIs and data systems, mentor senior engineers, ensure regulatory-compliant developer experiences, and lead incident remediation and cross-team technical strategy.

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.

Own integration design and strategy for Salesforce and connected systems. Architect data ownership and ERDs, build robust code-driven integrations (REST, SOAP, webhooks), ensure retries/idempotency/reconciliation, replace brittle no-code flows, implement CI/CD and metadata-as-code, build observability and runbooks, and partner with engineering, IT, and business stakeholders to operationalize integrations.

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.

As a Senior Software Engineer, you will design and implement scalable systems, lead modernization initiatives, and ensure operational reliability while collaborating with teams and mentoring engineers.

The Senior Software Engineer will reshape the auto repossession and remarketing platform, incorporating AI to enhance operational efficiency and system quality while taking ownership of architecture and technical decisions.

Build scalable ML data pipelines for Waabi's autonomous driving platform. Design, optimize, and manage datasets and training processes while collaborating with scientists and engineers.

Seeking Data Platform Engineers to design, build, and manage scalable data pipelines and analytic query engines while ensuring data integrity and performance optimization.

As a Backend Software Engineer, you'll develop critical backend systems focusing on APIs, data processing, and infrastructure while ensuring high-quality service delivery and robust architecture.

Lead development of backend systems and integrations to ingest and process large-scale data, design secure multi-tenant SaaS architectures, own APIs and platform work, mentor engineers, author technical proposals, and troubleshoot production issues to minimize downtime.

Lead end-to-end AI solutions as a forward-deployed engineer: scope, design, and deploy ML/LLM systems; partner with clients and stakeholders; build infrastructure, data pipelines, and reusable platform components; mentor engineers; own projects from discovery through production and provide on-call support.

Lead design and implementation of a zero-to-one, real-time collaborative web content platform. Own architecture, build backend sync and delivery services, craft low-latency frontend editing experiences, define engineering standards, evaluate third-party tradeoffs, and mentor engineers while partnering with product and design.

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.

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.

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.