Top Full Stack Developer Jobs in Toronto

Design, implement, and deploy Java/Spring Boot microservices and single-page applications for an event-driven deal management platform. Participate in coding, peer reviews, CI/CD, performance tuning (MongoDB), testing (TDD/BDD), troubleshooting, and lead agile delivery efforts with product and DevOps partners.

Design, architect, and ship full‑stack monetization and ad-creation UI features. Build scalable React/TypeScript frontends, integrate with GraphQL/REST backends, run prototypes/A-B tests, ensure automated testing and code quality, and collaborate with product, design, and backend teams.

The Full Stack Engineer will develop and maintain scalable web applications, design system architecture, optimize performance, and collaborate with teams for code reviews in a hybrid work environment.

Build end-to-end features, design intuitive interfaces, manage asynchronous backend jobs, and contribute to open-source efforts, while leading project development from concept to monitoring.

Develop and deliver user-friendly software for B2B SaaS products. Collaborate with teams on both front-end and back-end development.

Build end-to-end live streaming and game features across frontend and backend for a high-scale, bursty consumer product. Ship reliable, performant real-time systems using AI-assisted development, and own features from development through production and monitoring.

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.

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.

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.

Design and develop full-stack features, focusing on backend systems with some frontend work, while modernizing applications and integrating AI tools.

Join Hightouch as a front-end focused full stack engineer, building user-friendly interfaces and collaborating with teams to enhance customer engagement through data.

As a Full Stack Engineer, you'll own the development of features from design to production, collaborate with various teams, and continuously improve the platform by solving technical challenges.

As a Full Stack Software Engineer at Doxel, you will design and develop full-stack applications, collaborating cross-functionally to optimize user experiences and facilitate data processing for construction projects.

The Lead Software Engineer will design and develop full-stack applications for construction project management, ensuring intuitive data workflows and collaborating across teams to enhance user experience and performance.

Senior hands-on full-stack engineer who leads architecture, drives cross-team technical roadmaps, implements scalable Django/React systems, improves CI/CD and testing practices, mentors engineers, and partners with product, clinical, and executive stakeholders to translate business needs into durable technical solutions.

As a Senior Full-stack Developer, you'll code back and front ends for the Drag Me apps, maintain app data, identify bugs, and improve operations while collaborating with a cross-functional team.

As a Senior Full-Stack Software Engineer, you will design, build, and ship AI-powered systems to optimize workflows in the single family rental market, focusing on backend services and full-stack development in a fast-paced environment.

The Senior Full Stack Software Engineer at StackAdapt will develop and enhance their advertising platform, mentor other engineers, and collaborate with various teams to solve technical challenges while improving performance and user experience.

Lead architecture and implementation across the full stack, rework user and license management, and develop core runtime components for a code-first PCB design product. Drive technical direction, identify and fix technical debt, mentor engineers, perform code reviews, and build production-ready, high-performance systems involving computational geometry and advanced visualization.

Design and maintain a federated GraphQL server-driven UI and full-stack client platform. Build shared React/TypeScript libraries, optimize GraphQL/SQL performance, set observability in DataDog, operate services on Kubernetes, own releases and on-call duties, improve testing and CI/CD, mentor teammates, and collaborate with product and design to deliver accessible, high-performance customer-facing features.

Embed with brokerage operations to observe and replace manual workflows with auditable automations and UIs. Design, build, deploy, monitor, and run production systems; instrument outcome metrics; collaborate with compliance, security, and domain experts; own full lifecycle including CI/CD, on-call, and incident response.

Join an early-stage B2B enterprise AI startup as a frontend or frontend-leaning fullstack engineer. Build user-facing products and standalone UI component libraries using React, TypeScript, and Next.js. Design and architect frontend features from scratch, handle fullstack responsibilities as needed, solve challenging technical problems, and contribute as a core member of the growing team in a hybrid Palo Alto office.

Design, build, and maintain full-stack features across frontend (TypeScript/React) and backend (JVM language or Python). Mentor engineers, participate in code reviews and pair-programming, deploy generative AI infrastructure, and ensure quality via unit testing and CI in an agile, remote environment.