Top Software Engineer Jobs in Toronto

The Software Development Engineer in Test (SDET) ensures quality through automated testing for core platforms in the Utilities & Energy sector, collaborating closely with software engineers to embed quality practices, enhance CI/CD processes, and expand automated test coverage.

Lead technical direction for a multi-ecosystem libraries build platform: generalize package indexing and build orchestration, automate CVE remediation end-to-end, drive agentic/AI-assisted patch generation guardrails, onboard .NET/Go/Rust ecosystems, set platform SLOs, mentor senior engineers, and be hands-on resolving toolchain and packaging failures to ensure scalable, reliable library builds and releases.

Design, build, and maintain cloud-native microservices and scalable search/data ingestion systems. Lead architecture, optimize database performance, implement event-driven solutions, mentor engineers, and collaborate across product teams to deliver reliable, production-ready cybersecurity platform features.

Lead platform and product architecture across teams, introduce technologies and best practices, resolve complex cross-team engineering challenges, guide global cloud and FedRAMP readiness, and mentor engineers while raising engineering quality and operational maturity.

Design and build AI-powered internal accounting tools and integrations. Own architecture, security, and code quality; translate accounting processes into production-grade backend systems; collaborate with product and accounting staff; document systems and scale tools responsibly.

As a Senior Software Engineer, you will develop and maintain Alpaca's platform services, including event streaming infrastructure and authentication systems, while ensuring software quality and reliability.

As a Senior Software Engineer, you'll design and build scalable market data systems, improve API architecture, and enhance overall system performance, contributing to Alpaca's infrastructure for trading financial assets.

Design, build, and enhance Cority's software platform across product streams. Own features end-to-end, debug cross-system issues, drive observability, contribute technical direction, perform code reviews, mentor junior engineers, and collaborate with Product Owners to translate requirements into scalable technical designs.

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.

The Senior Software Engineer, Voice AI will design and implement complex systems for emergency response communications, oversee AI integrations, and provide technical mentorship.

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.

The Senior Software Engineer ensures the reliability and performance of the Mural editor, collaborates on technical projects, and designs APIs for real-time collaboration. Responsibilities include product engineering, mentoring, and improving team processes while focusing on performance and developer experience.

Design, build, and operate production AI systems, enhance backend services, improve reliability, and collaborate on technical projects within the AI-native engineering team.

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.

Design, build, test, and maintain enterprise C#/.NET applications within agile teams. Develop scalable REST APIs and data models, write automated unit tests, enforce SOLID/OOP practices, mentor engineers, participate in planning/code reviews, and communicate with clients to deliver high-quality solutions.

As a Junior Software Engineer, you will develop full stack features for an AI-powered web application, integrating AI models and collaborating with senior engineers. Responsibilities include building backend services and creating user experiences while participating in design discussions and code reviews.

Lead AI technical strategy, architect AI systems, set safety standards, mentor engineers, and evaluate AI models at Midi Health, a healthcare-focused company.

You will design and build LLM-powered features, integrate AI capabilities into workflows, and contribute to internal practices at a healthcare-focused company.

The Senior Software Engineer will design, build, and maintain solutions for transit agencies, focusing on IoT devices and cloud services, ensuring reliable communication and device management.

Lead architecture and implementation of Chainguard's Repository platform: design, build, and operate high-availability Go backend services and package registries. Drive scalability, reliability, observability, and load testing; make technical decisions on service boundaries and operations; collaborate across teams; and mentor engineers to deliver a unified artifact-serving experience.

Design and build authentication, authorization, and audit platform services (RBAC/ReBAC, token issuance, session handling), implement SAML/SCIM/OIDC/OAuth2/MFA flows, ship SDKs and APIs, operate distributed systems at scale, build audit telemetry, and support migrations and on-call production reliability.

Design and implement full‑stack features for a cloud-native SaaS platform using React front-end and C# back-end. Build case management and shared UX, write automated tests, deploy and scale services, participate in code reviews, and collaborate with product and UX teams to deliver customer-focused solutions.