Top Full Stack Developer Jobs in Toronto

Embed with brokerage operations to observe and automate manual workflows; design, build, deploy, and monitor auditable backend services and UIs; measure impact with operations metrics; produce RFCs; collaborate with compliance/security; own CI/CD, on-call, and incident response for production systems.

Lead development and design of enterprise Java applications across frontend and backend. Drive architecture, coding standards, testing, and deployment; resolve complex problems; integrate systems; mentor mid-level developers; and ensure regulatory and policy compliance.

Design and develop user interfaces and backend architectures for web applications, ensuring seamless integration and optimal performance using modern web technologies.

As a Full Stack Engineer, you'll develop and maintain features, expand product lines, and explore AI applications in security infrastructure.

Lead full‑stack development of the imaging web platform: architect and build ASP.NET Core services and Vue frontends, design secure APIs integrating EMRs and AI, own testing, CI/CD, and Azure deployments, mentor engineers, and collaborate with product, design, and clinical teams to deliver performant, reliable screening experiences.

Lead design and delivery of full-stack imaging features, architect high-performance ASP.NET Core services, build Vue frontends, integrate APIs with EMRs and imaging partners, mentor engineers, enforce automated testing, CI/CD and observability, and drive technical roadmap in an Agile team.

As a Senior Full-Stack Developer at gaiia, you will architect, develop, and manage critical systems in a serverless environment, collaborating on core modules related to customer management.

Senior front-end–leaning full-stack developer to own end-to-end feature delivery across diverse SaaS stacks. Use AI-augmented development tools to accelerate builds, modernize legacy systems, ensure test coverage and safe deployments, mentor junior engineers, and communicate progress to leadership while delivering polished, user-focused UI/UX.

Lead end-to-end feature development and modernization across diverse SaaS stacks, using AI-augmented tooling to accelerate delivery. Maintain legacy production stability, establish testing and secure deployment workflows, and mentor junior engineers while partnering with business stakeholders.

Lead end-to-end feature development across diverse web stacks with a front-end emphasis, modernizing legacy SaaS applications while ensuring stability, test coverage, and secure deployments. Champion AI-augmented development practices and agentic coding tools to accelerate delivery, mentor engineers, and communicate progress to leadership.

Build and own end-to-end fullstack features for a marketing analytics dashboard. Lead technical direction, collaborate with product and customer teams, optimize frontend performance, create and maintain APIs, ensure reliability and scalability, and mentor other engineers.

Develop scalable front-end and back-end features for a consumer-facing 3D/AR product using computer vision. Collaborate with product and design, own systems lifecycle, ensure performance and quality, unblock partners, and continuously learn and improve.

As a Senior Full Stack Software Engineer at Doxel, you will design and develop applications for project management, focusing on complex data handling and intuitive UI. Your role involves collaborating across teams and providing technical leadership in software projects.

Design, develop, and implement scalable eCommerce solutions using Commercetools across the full stack. Build and integrate front-end applications and APIs, collaborate with product, design, and engineering teams, and deliver high-quality, performant digital commerce experiences while working Eastern Time hours.

Build and ship full-stack features for North, develop autonomous agents that access sensitive enterprise data, productionize state-of-the-art models, write minimal, secure low-resource code, and collaborate with researchers to deploy performant RAG/agentic applications while prioritizing security and user experience.

Design and build low-latency, high-throughput backend services and REST/GraphQL APIs using Core Java and Spring. Implement full-stack features with React/JavaScript, write SQL for real-time analysis, apply CI/automation testing, and work in microservices containers on cloud platforms (GCP/AWS). Collaborate in cross-functional agile teams to deliver product roadmap initiatives.

Lead the development of secure and scalable SaaS applications focusing on AI/ML integrations and backend systems, while collaborating across teams to optimize functionality and performance.

The Java Full Stack Developer leads applications systems analysis, resolves complex problems, develops standards for coding, and coaches mid-level developers while ensuring compliance and risk assessment.

Build and scale the signup and onboarding experience using React and Node.js, run A/B experiments, develop third-party integration entry points, collaborate with Product/Design/Data Analytics, maintain full-stack features, and participate in on-call rotation to ensure a reliable production environment.

Design, develop, and maintain large-scale Java-based microservices and APIs. Mentor junior engineers, lead small projects, perform advanced debugging/refactoring, ensure API security and quality, and collaborate with product and analytics.

Build and architect user-facing products and reusable UI component libraries using React, TypeScript, and Next.js. Design frontend systems, solve complex technical problems, and take on full-stack responsibilities at an early-stage, hybrid Palo Alto team.

Build end-to-end features across frontend and backend for the Mem0 platform using Next.js and Python. Design APIs, UIs, backend services, and data models; optimize performance and reliability; write tests and operate production systems; collaborate with design, research, and customers to deliver scalable AI memory product experiences.

Senior Full Stack Developer to design and build scalable full-stack applications and enhancements. Implement features and integrations, improve code quality, performance, and scalability, and collaborate with engineers, designers, and analysts to deliver reliable digital products for nuclear industry clients.

Build and maintain scalable SaaS platform integrations connecting CoLab to CAD, PLM, ERP and enterprise systems. Design, develop, test, and ship user-facing features and robust APIs. Participate in code reviews, mentor junior engineers, contribute to technical direction, and improve product UX and performance.

As a Senior AI Full Stack Developer, you will build and deploy AI-powered tools, integrate APIs, optimize workflows, and collaborate across teams to enhance cybersecurity practices.