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