Top Full Stack Developer Jobs in Toronto

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 Fullstack Software Engineer, you will develop products for the post-purchase experience by implementing features, maintaining code quality, and mentoring other engineers.

Build and own user-facing web experiences with a front-end focus using React, Next.js, and TypeScript. Work across the full stack (Node.js/NestJS), design and integrate REST APIs, collaborate with product and design, run growth experiments, ensure accessibility/performance, write tests, support production through on-call rotations, and contribute to payments and banking integrations.

Lead development of applied generative AI features across front-end and back-end. Design and deploy APIs and microservices, integrate databases, collaborate with UX/product/data science, mentor engineers, conduct code reviews, and optimize performance and usability.

Design, build, and evolve the frontend and backend of a cloud-based clinical AI platform; own architecture, break down ambiguous problems, and collaborate with Product, Design, ML, Security, and Infrastructure teams while integrating AI-assisted development workflows.

Build end-to-end features for Faire's Brand pillar, collaborating with product, design, and data. Work across backend, frontend, and mobile stacks to optimize performance and scalability, mentor engineers, and drive product improvements from discovery through implementation while using modern tooling and AI productivity aids.

Build and maintain production React/Redux front-ends and Java Spring Boot back-ends; use agentic AI tools across the SDLC for specs, coding, testing, reviews, and debugging; create APIs, integrations, automated tests, ensure production readiness, observability, security, and take ownership through release and production verification.

Design, develop, test, and maintain full-stack distributed software systems. Work with Java/J2EE technologies, databases (MySQL/JDBC), Windows and Linux servers, network protocols (HTTP/HTTPS/TCP-IP), and collaborate across teams to deliver secure, accessible cloud-based solutions.

Lead design, implement, and maintain a scalable SaaS insurance platform across front-end and back-end. Provide technical direction, mentor developers, enforce best practices, optimize performance, ensure security and compliance, and drive adoption of modern architectures and testing methodologies.

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.

Lead design and implementation of full‑stack authentication and account security features for Stripe Organizations. Build APIs, frontend UX/UI, and analytics to secure and simplify login, SSO, MFA, RBAC, and account workflows. Mentor engineers, drive technical decisions, collaborate with Security and partner teams, and create reusable auth building blocks used across Stripe products.

The Staff Software Engineer will lead technical solutions and architectural reviews, mentor engineers, and drive the development of scalable healthcare products.

Build and maintain full-stack features for customer and internal web apps, design backend APIs for onboarding and transactions, integrate third-party services, implement OAuth2 authentication, operate in a microservices AWS environment, ensure security, performance, observability, participate in code reviews and architecture, and write technical documentation.

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.

Join a graduate program contributing to reengineering and building full-stack Java applications for financial and risk systems. Collaborate with global teams to design, develop, test, and deploy scalable, resilient, and well-tested software while working closely with business stakeholders.

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.