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
- Robust 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