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S.I. Systems Ltd.

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Senior React Node.js Developer

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Summary

Contract senior fullstack engineer (through December 2026) building enterprise SaaS applications with React, TypeScript, Node.js, and NestJS for a consumer business client. Hybrid role onsite 2–3 days per week in Downtown Toronto or Brampton, covering REST APIs, Google Cloud integrations, and automated testing.

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
  • Strong 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.

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