Top Full Stack Developer Jobs in Toronto

As a Full Stack Engineer, you'll develop StackAdapt's advertising platform, focusing on campaign integrations, API-driven products, and scalable web architecture. You'll handle complex integrations, manage state machines, and ensure reliability patterns.

Design and build an AI assistant and proprietary AI systems for residential property management. Own end-to-end development from ideation to production, maintain high code quality, ship product features, and lead cross-functional engineering efforts.

Build and maintain end-to-end product features across the stack (AWS, Python, Postgres, React, HTML/CSS). Collaborate with product and design, participate in design meetings, automate processes, advocate best practices, and deliver modular, reliable, and extensible solutions.

Senior full-stack developer responsible for end-to-end design, development, testing, and deployment of features on the Citi Velocity platform. Solve complex UI and server-side problems, champion information security, collaborate with users and tech teams, and mentor junior developers in an agile environment.

This role leads application system design and implementation, drives collaboration across teams, manages projects, and mentors developers while ensuring risk compliance.

The Senior Full Stack Engineer will drive product evolution through full-stack development, focusing on backend APIs with Python and frontend applications using React and TypeScript, while managing the software development lifecycle.

Senior full-stack engineer to build customer-facing features across banking, tax automation, and expense tracking. Work across backend APIs, MySQL/Spanner data models and React/TypeScript frontends. Own end-to-end delivery, improve architecture and reliability, mentor engineers, and drive engineering standards and debt reduction.

Build full‑stack Pinner‑facing features, lead product development from ideation through release, partner with design/product/backend teams, prototype and run A/B tests, employ automated testing, and architect scalable solutions used by millions.

Design, build, and operate a scalable, secure cloud-native AI platform and services. Implement Akka-based event-driven microservices, MLOps pipelines, feature stores, model registries, orchestration, CI/CD, and APIs/SDKs. Optimize runtimes (CPU/GPU), ensure reliability, security, compliance, and support continuous/online learning and high-traffic agent interactions.

Senior full‑stack developer responsible for designing, developing, and maintaining enterprise‑scale React.js frontends and Java (17+) Spring Boot microservices. Modernize Angular apps to React, build REST APIs and event‑driven pipelines with Kafka, integrate SQL and NoSQL databases, support CI/CD and containerized deployments (Docker, Kubernetes, OpenShift), and monitor production systems using ELK/Grafana.

Lead design and implementation of scalable APIs and agent communication layers for an AI-agent driven advertising marketplace. Build high-throughput backend systems, integrate agent frameworks and adtech partners, drive architecture for authentication and protocols, mentor engineers, and prototype agent communication patterns while collaborating with product and design.

Build and maintain backend services in Rust and Node.js and full-stack features in TypeScript. Own features end-to-end, write unit and integration tests, improve CI and agentic development workflows, refine APIs/webhooks, troubleshoot production issues, participate in on-call rotation, and collaborate within an Agile distributed team.

Build and own end-to-end full-stack features across patient, clinician, and operations products using Django/DRF and React/Next.js. Partner with cross-functional teams to design systems, write scalable maintainable code, improve CI/testing, perform code reviews, mentor engineers, and adopt AI coding tools to increase productivity.

Lead migration of enterprise SQL Server databases to PostgreSQL, convert and optimize T-SQL to PL/pgSQL, use AWS DMS/SCT and CDC strategies, develop backend services (C#, Node.js), contribute C++ data-layer work, build cloud-native AWS services, implement IaC with Terraform and CI/CD with GitLab, and support testing with Jest and Playwright.

Build and maintain consumer-facing front-end experiences (primary) and backend services (secondary) for post-purchase products. Implement UI components from Figma, own frontend architecture, mentor engineers, and integrate AI-first workflows. Contribute to Go/Node.js services, deploy on cloud (GCP/AWS/Azure), work with datastores (Postgres, Spanner, BigQuery, Bigtable), and implement REST/GraphQL APIs.

Build and ship end-to-end full‑stack features running reliably on customer premises. Own backend and UI work, design parsers/connectors/protocols, collaborate with product and customers, and contribute to a small, high-autonomy engineering team.

Design, build, and maintain scalable full‑stack applications using React, TypeScript, and NestJS. Translate business requirements into architecture and design, contribute to system and API design, support CI/CD and DevOps practices, integrate AI coding tools (Claude Code) and agentic workflows, establish prompt engineering standards, and define guardrails for AI‑generated code. Work on large‑scale, production‑grade distributed systems.

Lead design and implementation of secure, scalable backend services, APIs, event-driven pipelines, and content-driven frontends. Integrate GenAI and third-party SaaS, manage cloud infrastructure with Infrastructure as Code, implement enterprise authentication/authorization, participate in architecture and security reviews, and mentor engineers while promoting Shift-Left SDLC practices.

Build and own end-to-end user-facing product features for an enterprise AI SaaS. Design, implement, and ship AI agents, backend services, APIs, and web UIs. Collaborate cross-functionally to create customer-facing features and internal tools, move quickly, and maintain production systems used by real users.

Own end-to-end product features: design, build, ship, and iterate. Lead Angular front-end architecture and collaborate with backend teams (Go/Node/Python). Use AI-assisted development tools daily, instrument and analyze feature usage, run experiments, and mentor engineers while driving engineering excellence and cross-functional product decisions.

The role requires designing and developing web applications and backend systems, integrating LLMs, and ensuring quality software delivery.

The Full-Stack Engineer will develop and maintain web applications, translating UI/UX designs into responsive apps, optimizing applications, and writing clean code.

The Senior Full Stack Software Developer will design, develop and implement scalable applications, manage system architecture, mentor developers, and drive engineering excellence.

The Senior Full Stack Developer will enhance Practice Better's AI-powered platform by developing software solutions, collaborating with teams, and optimizing performance.

Responsible for leading programming efforts, mentoring teammates, and developing robust, cloud-based applications using modern technologies and methodologies.