Sr Full Stack Developer (Next.js / NestJS)
S.i. Systems
Toronto, ON-
Number of positions available : 1
- Salary To be discussed
-
Contract job
- Published on February 13th, 2026
-
Starting date : 1 position to fill as soon as possible
Description
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
AI may be used in evaluating candidates.
This posting is for an existing vacancy.
Requirements
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