Full Stack Javascript Developer

S.I. Systems Ltd.; Toronto; On-site; CAD 110,000 - 140,000; Full time

Job summary

S.I. Systems Ltd. in Downtown Toronto / Brampton is seeking a Senior Fullstack Engineer to design and deliver enterprise-scale SaaS platforms using JavaScript/TypeScript, React, and Node.js.

You will develop responsive UIs, robust backends, and scalable RESTful APIs within an Agile team, with a strong emphasis on performance, reliability, and maintainability.

Qualifications

• 3+ years React development for enterprise apps.
• 3+ years Node.js development.
• Strong RESTful APIs and API architecture knowledge.

Responsibilities

• Develop modern JavaScript/TypeScript SPAs using React.
• Build and maintain Node.js/NestJS backends with GCP integration.
• Design and implement scalable RESTful APIs and backend integrations.
• Write unit and automated tests to ensure quality.
• Collaborate in an Agile/Scrum team to meet evolving requirements.
• Contribute to software architecture and UI/UX discussions.
• Participate in code reviews and promote engineering best practices.
• Troubleshoot and optimize application performance and reliability.
• Stay current with modern web development practices.
• Support learning and knowledge sharing within the team.

Skills

React

Node.js

RESTful APIs

Tools

JIRA

Confluence

Terraform

Google Cloud Platform

Job description

The ideal candidate is passionate about building efficient, intuitive, and high-quality user interfaces for enterprise-scale SaaS platforms and takes pride in

delivering reliable, maintainable software.

You will work in a fast-paced, collaborative environment using Agile/Scrum methodologies to design, develop, and deliver solutions that support evolving

business and customer needs.

Location: Downtown Toronto / Brampton - 2 to 3 days per week to start for team ramp up;1-2 days per week after that

Start Date: ASAP

End Date: to December 2026, will be renewed until December 2027, or longer

What You'll Do

• Design and build responsive, accessible, and user-friendly web interfaces using modern HTML5 and CSS3
• Develop robust Node.js/NestJS backend services that integrate with Google Cloud and external APIs
• Design, develop, and maintain scalable RESTful APIs and backend integrations
• Write and maintain unit and automated tests to ensure software quality, reliability, and maintainability
• Collaborate within an Agile/Scrum team to deliver solutions that meet evolving business requirements
• Contribute to software architecture, technical design, and UI/UX discussions
• Participate in code reviews and promote engineering best practices
• Troubleshoot, optimize, and continuously improve application performance and reliability
• Stay current with emerging technologies, industry trends, and modern web development practices
• Support a collaborative team culture that encourages learning, knowledge sharing, and continuous improvement

Must Haves

• 3+ years developing applications with React
• 3+ years developing applications with Node.js
• Strong understanding of RESTful APIs and API architecture

Nice to Have

• Experience with JIRA and Confluence
• Experience with Terraform
• Experience with Google Cloud Platform (GCP)

Our consumer business client is seeking a Senior Fullstack Engineer (10+ years) to develop enterprise-scale SaaS platforms using JavaScript/TypeScript, React, and Node.js

This is a fantastic opportunity for an experienced Senior Fullstack Developer (JavaScript/TypeScript) to join a growing software development team.

The ideal candidate is passionate about building efficient, intuitive, and high-quality user interfaces for enterprise-scale SaaS platforms and takes pride in

delivering reliable, maintainable software.

You will work in a fast-paced, collaborative environment using Agile/Scrum methodologies to design, develop, and deliver solutions that support evolving

business and customer needs.

Location: Downtown Toronto / Brampton - 2 to 3 days per week to start for team ramp up;1-2 days per week after that

Start Date: ASAP

End Date: to December 2026, will be renewed until December 2027, or longer

What You'll Do

• Develop and maintain modern JavaScript/TypeScript single-page applications (SPAs) using React
• Design and build responsive, accessible, and user-friendly web interfaces using modern HTML5 and CSS3
• Develop robust Node.js/NestJS backend services that integrate with Google Cloud and external APIs
• Design, develop, and maintain scalable RESTful APIs and backend integrations
• Write and maintain unit and automated tests to ensure software quality, reliability, and maintainability
• Collaborate within an Agile/Scrum team to deliver solutions that meet evolving business requirements
• Contribute to software architecture, technical design, and UI/UX discussions
• Participate in code reviews and promote engineering best practices
• Troubleshoot, optimize, and continuously improve application performance and reliability
• Stay current with emerging technologies, industry trends, and modern web development practices
• Support a collaborative team culture that encourages learning, knowledge sharing, and continuous improvement

Must Haves

• 5+ years of professional development with JavaScript/TypeScript and core JavaScript concepts
• 3+ years developing applications with React
• 3+ years developing applications with Node.js
• Strong understanding of RESTful APIs and API architecture

Nice to Have

• Experience developing high-traffic or enterprise-scale web applications
• Experience with JIRA and Confluence
• Experience with Terraform
• Experience with Google Cloud Platform (GCP)

Disclaimer:
AI may be used in evaluating candidates.
This posting is for an existing vacancy.