Top Full Stack Developer Jobs in Toronto

Build and maintain authentication, authorization, and user management services across web and mobile. Implement IAM features, contribute to scalable identity systems, write secure testable C# and TypeScript code, design/consume REST or GraphQL APIs, document systems, participate in code reviews and on-call rotation, and collaborate with product, design, and engineering teams to improve reliability and developer experience.

Join the Inference Core Model Bringup team to bring up ML models on Cerebras CSX systems, focusing on performance, optimization, and debugging.

Design, build, and maintain backend services and REST APIs with NestJS/TypeScript and MySQL; implement React/Tailwind UI components; integrate frontend and backend; support Kafka messaging; collaborate with product/design using Figma; use AI coding tools to accelerate development and work in an agile cross-functional team.

Seeking a Full Stack Engineer to design, build, and scale consumer-facing applications for Goldin, focusing on cloud-native architectures, AWS, and APIs while collaborating with cross-functional teams.

Design, build, and deploy scalable full-stack seller experiences using React, Node.js, and TypeScript. Own APIs, microservices, data models, CI/CD, observability, and production support. Collaborate with product and engineering teams, optimize performance and developer productivity, create reusable components, and mentor engineers to raise technical standards.

Design, build, and deploy scalable full-stack applications and APIs using React, Node.js, and TypeScript. Collaborate with cross-functional partners to deliver seller experiences, create reusable components and shared libraries, and improve developer productivity. Ensure software quality, observability, and operational excellence through testing, CI/CD, and production support. Mentor engineers and drive technical decisions to raise engineering standards across the team.

As a Senior Full-Stack Engineer at Retell AI, you'll develop scalable systems and intuitive interfaces, bridging backend integrations with frontend experiences, focusing on voice automation solutions.

Design and maintain data warehouse systems, develop ETL pipelines, manage datasets for analytics, and implement real-time data solutions.

You will build and maintain features across frontend and backend stacks, design analytics dashboards, optimize APIs, and ensure database performance while collaborating with various teams.

As a Senior Software Engineer at Vanta, you will lead projects, set technical direction, develop product functionality, and mentor engineers, leveraging modern frameworks like TypeScript, React, and Node.js.

Build and maintain backend services, REST APIs, databases, customer-facing products, internal tools, and data platforms. Improve database architecture, performance, reliability, scaling, and migrations. Contribute to full-stack development, AWS infrastructure, serverless systems, CI/CD, deployments, monitoring, and architectural decisions while collaborating with product, design, and leadership.

Lead end-to-end technical strategy and roadmap for a global cash & intraday liquidity platform. Design and operate highly available, multi-region distributed systems, embed AI-first tooling, ensure compliance and security, and build and grow a global engineering organization while staying hands-on in architecture and delivery.

Design, build, test, and maintain Magnet One cloud platform features across front-end and back-end. Collaborate on architecture, perform code reviews, troubleshoot defects, and drive best practices for secure, performant, and maintainable software.

As a Senior Full Stack Software Engineer, you will build and improve products, create user interfaces and APIs, and collaborate with various teams to enhance the customer experience.

Develop and maintain enterprise full-stack applications across the software development lifecycle. Responsibilities include building front-end interfaces and back-end services, developing REST and SOAP APIs, designing data pipelines and database integrations, testing and troubleshooting applications, supporting deployments and migrations, and collaborating with business and IT stakeholders. The role requires React, Angular, JavaScript, Java, Oracle, SQL Server, web application technologies, DevOps practices, and Agile/Scrum experience.

As a Staff Full Stack Software Engineer, you will design and build foundational infrastructure, develop enterprise features, and ensure system reliability handling sensitive legal data.

As a Full Stack Product Engineer, you will design and deliver features, collaborating with product teams while taking ownership of projects and ensuring system performance and maintainability.

Lead end-to-end development and production ownership of AI-driven backend capabilities and LLM/voice agent workflows. Improve reliability, observability, security, and operational maturity while iterating quickly from customer feedback and scaling team delivery.

Build and ship the App Runtime platform enabling rapid web app development and deployment. Work across frontend and backend (React, Go, Python, Java), author technical/design specs, partner with developer customers, improve quality/reliability, mentor engineers, and coordinate with AI, container platform, and security teams.

Design, build, and maintain end-to-end full‑stack features across Python/FastAPI backend, Next.js frontend, and LLM inference pipelines. Collaborate cross‑functionally to deliver scalable AI-powered patent analysis, optimize performance, address production issues, and reduce technical debt while improving engineering practices.

Lead the development team in designing and building scalable applications, facilitating architecture discussions, and collaborating closely with clients and team members.

Develop and design scalable applications in a team-based Agile environment, collaborating on features and exploring new technologies.

The Senior Full Stack Developer will design and develop Salesforce solutions, manage internal instances, ensure quality and performance, and collaborate across teams in an Agile environment.

As a Full Stack Software Developer, you'll design and develop scalable applications, collaborate with teams, and apply new technologies in an Agile environment.

Build enterprise applications as a Senior Software Developer, focusing on full stack development within an Agile team using various technologies.