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Sr Full Stack Developer; Next.js​/NestJS

Job in Toronto, Ontario, M5A, Canada
Listing for: S.i. Systems
Full Time, Contract position
Listed on 2026-02-12
Job specializations:
  • Software Development
    Node.js, React.js
Job Description & How to Apply Below
Position: Sr Full Stack Developer (Next.js / NestJS)

Our client in the Digital Health Space is looking for a Sr Full Stack Web Developer (Next.js / NestJS)

Duration:
Until Dec 31st

Location:

1x day onsite downtown

x2 one more front end focused on backend

Key Responsibilities

  • Extend and maintain an existing Next.js application built on React
  • Integrate frontend components with backend APIs (Node/NestJS and Python FastAPI)
  • Collaborate with embedded teams across the broader platform
  • Implement new user-facing features while maintaining performance and stability
  • Work within established architecture, coding standards, and deployment pipelines
  • Participate in code reviews and contribute to maintainable, high-quality code
  • Must-Have Requirements

  • Hands-on experience with Next.js (React-only experience is not sufficient)
  • Strong JavaScript / TypeScript skills
  • Experience working in existing production codebases
  • Experience with Node.js backend frameworks
    , preferably NestJS
  • Experience consuming REST APIs
  • Ability to ramp quickly in a contract-based role
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