Top Full Stack Developer Jobs in Toronto

Build and deploy production-grade AI features and backend services for generative AI, LLM integrations, conversational AI, and retrieval-augmented systems. Collaborate with product, research, and data teams, contribute to design and code reviews, implement evaluation pipelines, monitor production quality, and mentor junior engineers.

Build and lead design, implementation, and production deployment of Generative AI and LLM-powered systems. Own backend services, model integration, RAG/agent architectures, evaluation pipelines, monitoring, and reusable GenAI platform components while mentoring engineers and partnering with cross-functional teams.

As a Senior Software Engineer, Full Stack, you will build backend services and APIs for a document analysis platform, focusing on server-side architecture and data processing, while also contributing to frontend features as needed.

The React Full Stack Developer will design, develop and maintain web applications, leveraging expertise in Java and JavaScript frameworks, specifically React, along with deep knowledge of cloud-native application development and microservices architectures.

The Full Stack Developer will design, implement, and support application systems, conduct feasibility studies, oversee development phases, and provide user support, while managing projects and ensuring compliance.

Lead end-to-end design and delivery of high-performance, interactive FinTech analytics and reporting platforms. Build Angular/React frontends and Java/Spring Boot low-latency microservices, optimize ETL and Starburst (Trino) queries, create MCP servers to connect LLMs/AI agents to enterprise data, and implement Aspose-based document generation. Mentor engineers and validate AI-generated code with CIB domain expertise.

Senior full-stack Java developer responsible for hands-on coding, code and design reviews, system design, and mentoring. Collaborate globally to deliver microservice-based solutions, follow engineering standards, consult with stakeholders, and participate in SDLC activities including unit testing within an Agile/Scrum environment.

The Senior Growth Platform Engineer will design and build scalable backend systems, APIs, and growth infrastructure to enhance experimentation and targeting capabilities for retailers.

Own and maintain Kotlin-based backend services for Faire's Insider membership program. Collaborate with Data Science, Product, and Design to prototype and productionize ML-driven features, run experiments and analytics to measure performance, optimize service design and performance, reinforce membership benefits across customer surfaces, and mentor engineers on architecture and best practices.

Lead architecture and implementation of an Identity Security Fabric for AI agents. Build scalable backend services, integrate complex APIs, enforce auth and least-privilege for agent access, drive AI-native engineering practices, improve CI/CD/observability, and mentor engineers while partnering with product and design to deliver enterprise-grade identity governance and protection features.

Lead full-stack engineering for card acquisition and onboarding across mobile, web, and backend. Define technical strategy, deliver quarterly goals, mentor engineers, ensure operational reliability (monitoring, on-call, CI/CD), collaborate with product/design/analytics, and drive quality, experimentation, and scalable backend systems.

Design, build, and maintain scalable full-stack web applications using Python, .NET and modern frontend frameworks. Develop REST APIs, integrate AI/ML or LLM capabilities, work with relational/NoSQL databases, deploy to cloud environments, optimize performance, and ensure security and quality through testing, code reviews, and collaboration with cross-functional teams.

Design, build, and operate eBay's experimentation and feature-flag platform across the full stack. Implement scalable, low-latency services (NodeJS/Java), develop React frontends, drive architecture and observability, collaborate with data scientists and stakeholders, and own production reliability and incident response.

Build and ship end-to-end product features across frontend and backend: design APIs, develop backend services and asynchronous pipelines, implement responsive React UIs, optimize performance and reliability, work with AWS and queueing systems (e.g., SQS), and collaborate with product and design to deliver polished, scalable workflows.

Own and build end-to-end product features across frontend and backend: design APIs, develop backend services and asynchronous pipelines, implement high-performance React UIs, optimize reliability and scalability, work with AWS and queueing systems (e.g., SQS), and collaborate with product and design to ship data-intensive workflow automation.

Join a small engineering team to design, prototype, and build scalable, performant SaaS products. Architect systems, set technical strategy, collaborate across teams, and take ownership of shipping production software.

Lead technical projects for product scaling. Design and maintain APIs and services, ensuring reliability and user experience while collaborating with product teams.

Lead application systems analysis and programming activities, ensuring integration of functions, resolving complex problems, and coaching mid-level developers. Focus on full stack development using Java, JavaScript, and modern architecture principles.

The Lead Java Developer will design, build, and support web applications, focusing on both front-end and back-end development using Java, Spring Boot, Angular, and microservices architecture.

Senior Java Full Stack Developer responsible for designing, building, testing, and supporting scalable Java/Spring Boot microservices and React front-ends. Deliver secure, maintainable solutions, participate in code reviews, production support, and continuous improvement while collaborating with business and technology partners.

Design, build, and maintain full stack web applications and APIs for Investment Banking and Global Markets. Implement responsive React UIs, backend services (FastAPI/Flask/Node.js), data pipelines, microservices, and real-time data handling. Integrate generative AI/LLM APIs, ensure performance, security, testing, and monitoring, and collaborate with data scientists and stakeholders to deliver scalable, production-grade solutions.

Participate in analysis, design, development, testing, and implementation of application systems. Provide user support, perform feasibility and risk assessments, recommend security and process improvements, coach junior analysts, and consult with stakeholders to deliver application solutions while ensuring regulatory and policy compliance.

Full stack developer responsible for designing, building, and maintaining backend services (Python/Django/Celery) and responsive frontends (React/JavaScript). Work includes PostgreSQL schema design, containerized deployments with Docker and Kubernetes, Helm chart management, and supporting distributed async task processing at scale.

Design and build scalable AI-powered full-stack applications: develop data pipelines (Dagster, dbt), backend services (Python, FastAPI), responsive frontends (React, TypeScript), integrate LLMs and RAG pipelines, implement MCP for agent workflows, ensure data quality and CI/CD, and collaborate with engineering and business stakeholders.

The Lead Full Stack Java Developer is responsible for leading software development, enhancing applications, and collaborating with teams for system improvements while ensuring compliance and ethical standards.