Top Full Stack Developer Jobs in Toronto

As a Senior Full Stack Software Engineer, you will build and improve products, create user interfaces and APIs, and collaborate with various teams to enhance the customer experience.

Senior full-stack engineer owning backend services, APIs and data models and contributing to frontend dashboards. Deliver end-to-end features, drive architecture and quality, collaborate with Product/Design, solve reliability and performance issues, and mentor cross-team technical standards.

Develop and maintain enterprise full-stack applications across the software development lifecycle. Responsibilities include building front-end interfaces and back-end services, developing REST and SOAP APIs, designing data pipelines and database integrations, testing and troubleshooting applications, supporting deployments and migrations, and collaborating with business and IT stakeholders. The role requires React, Angular, JavaScript, Java, Oracle, SQL Server, web application technologies, DevOps practices, and Agile/Scrum experience.

Build and own enterprise AI SaaS features end-to-end, including AI agents, backend services, APIs, and web UIs. Collaborate with engineering, product, design, and business leaders to ship customer-facing features and internal tools. The role requires production software experience, strong product judgment, autonomy, cross-functional communication, and comfort working across frontend and backend technologies in an ambiguous, fast-moving environment.

Build and maintain frontend and backend components for a rapidly scaling legal-tech platform. Develop APIs and backend systems in Go, implement React/TypeScript user interfaces, optimize performance and security, write tests and CI/CD pipelines, perform code reviews, mentor junior developers, and collaborate with Product and Design in an agile environment.

Lead end-to-end technical strategy and roadmap for a global cash & intraday liquidity platform. Design and operate highly available, multi-region distributed systems, embed AI-first tooling, ensure compliance and security, and build and grow a global engineering organization while staying hands-on in architecture and delivery.

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.

Lead end-to-end analytics and AI/ML initiatives: diagnose performance across customer/product/advisor dimensions, build scalable datasets, dashboards, segmentation, and predictive models, implement cloud-based ML solutions, produce executive-ready visualizations and stories, mentor teams, and drive adoption of advanced analytics across business stakeholders.

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.

As a Full Stack Product Engineer, you will design and deliver features, collaborating with product teams while taking ownership of projects and ensuring system performance and maintainability.

Design, build, test, deploy, and support web-based software solutions. Provide technical guidance, troubleshoot production issues, optimize performance, support databases, write documentation, estimate work, and mentor developers while improving coding standards and development processes.

As a Staff Full Stack Software Engineer, you will design and build foundational infrastructure, develop enterprise features, and ensure system reliability handling sensitive legal data.

Develop and improve a SaaS platform by designing, developing, and deploying scalable full-stack features. Responsibilities include contributing to architecture and technical decisions, ensuring application quality and security, participating in Agile planning and estimation, conducting code reviews, improving CI/CD practices, and using AI tools to enhance development productivity. The role requires collaboration, technical problem-solving, and continuous learning in a fully remote environment.

Develop and improve a scalable SaaS platform by designing, coding, testing, deploying, and reviewing full-stack features. Contribute to software architecture, application security, performance, stability, Agile planning, CI/CD improvements, and technical knowledge sharing. The role requires strong Node.js and React skills, collaboration with a multidisciplinary team, and the use of AI tools to enhance development productivity and quality.

Develop and deploy features for a SaaS platform using full-stack development practices. Responsibilities include architectural contributions, application quality and security, Agile sprint participation, code reviews, CI/CD improvement, collaboration, and use of AI tools to enhance development productivity. The role requires Node.js and React expertise, software development experience, Git proficiency, and bilingual French-English communication.

Lead end-to-end development and production ownership of AI-driven backend capabilities and LLM/voice agent workflows. Improve reliability, observability, security, and operational maturity while iterating quickly from customer feedback and scaling team delivery.

Build and ship the App Runtime platform enabling rapid web app development and deployment. Work across frontend and backend (React, Go, Python, Java), author technical/design specs, partner with developer customers, improve quality/reliability, mentor engineers, and coordinate with AI, container platform, and security teams.

As a Senior Full Stack Engineer, you'll build interactive customer experiences, manage backend architecture, write well-tested code, and ensure smooth production processes.

As a Senior Fullstack Engineer, you'll design and develop healthcare AI applications, architect scalable solutions, collaborate with teams, and optimize performance.

Build the new ShareGate Migrate web app as a senior full-stack developer using React, TypeScript, and C#/.NET. Ship full-stack features, shape technical choices, integrate Microsoft APIs (Graph, Azure AD/Entra ID, MSAL), mentor teammates, anticipate risks, and use AI-assisted development tools to accelerate delivery and quality.

Join a small engineering team to build and maintain full stack web applications and backend services using React, Python, Go, C++, PostgreSQL, and AWS. Contribute to APIs, responsive frontends, CI/CD, monitoring, debugging, and engineering best practices while collaborating on cloud-native distributed systems.

Build and own user-facing features and core platform architecture across frontend, backend, and ML pipelines. Integrate AI workflows (LLMs, embeddings) for curriculum generation and automated evaluation. Manage end-to-end development: requirements, design, implementation, CI/CD, testing, observability, and iteration while collaborating with product, design, ML, and customer teams.

Build polished, consumer-facing web and mobile features end-to-end using React/React Native and TypeScript. Own UI/UX, APIs, and data models (Node/GraphQL/Postgres), ship and iterate, diagnose production issues, and balance product, design, and engineering trade-offs to deliver fast, reusable experiences.

Own and evolve Directive's web surfaces for Stratos and company sites: build campaign and reporting UIs, integrate ad/CRM APIs, manage background jobs, containers, CI/CD, databases, telemetry, auth, and LLM integrations; stabilize inherited code and ship production features iteratively.

Design, build, and maintain end-to-end full‑stack features across Python/FastAPI backend, Next.js frontend, and LLM inference pipelines. Collaborate cross‑functionally to deliver scalable AI-powered patent analysis, optimize performance, address production issues, and reduce technical debt while improving engineering practices.