Build enterprise-scale SaaS interfaces with React and Node.js in Downtown Toronto or Brampton, working onsite two to three days initially.

This Senior Fullstack Engineer contract develops JavaScript and TypeScript applications for a consumer business client. You will create reliable, maintainable software while supporting evolving business and customer needs. The work includes React, Node.js, NestJS, RESTful APIs, and Google Cloud integrations.

Key Responsibilities: Develop JavaScript and TypeScript single-page applications using React

Build responsive, accessible interfaces with HTML5 and CSS3

Develop Node.js and NestJS services integrating external APIs

Maintain scalable RESTful APIs and backend integrations

Write automated tests and improve application reliability

Requirements: Five or more years developing JavaScript and TypeScript

Three or more years developing React applications

Three or more years developing Node.js applications

Solid understanding of RESTful APIs and API architecture

Agile and Scrum collaboration experience

Apply your React, Node.js, RESTful API, and TypeScript expertise to enterprise SaaS development through December 2026.

📌 Senior React Node.js Developer (Toronto)
🏢 S.I. Systems
📍 Toronto