Senior Full Stack Engineer

Location: Remote in the Greater Toronto Area

Schedule: Full-Time (35 hours/week)

Salary: $140K - $155K + Benefits + Paid Time Off

5 year long term contract position

Company:

Our client is a growing technology organization building modern digital products that combine collaborative learning, immersive experiences, and emerging technologies. Their team develops scalable web applications used by organizations and end users to deliver engaging online experiences, while fostering a highly collaborative engineering culture where innovation and technical excellence are encouraged.

Description:

Our client is seeking a Senior Full-Stack Engineer to play a key role in designing, developing, and scaling modern web applications. This position offers the opportunity to influence technical architecture, mentor engineers, and work closely with product and design teams to deliver high-quality software in a collaborative, fast-moving environment.

• Design, develop, and maintain full-stack web applications using modern technologies including Next.js, React, TypeScript, Prisma, and MongoDB, while contributing to shared platform architecture and reusable components.

• Build scalable APIs, data models, and backend services that support high-performance applications, real-time functionality, and seamless user experiences across multiple products.

• Collaborate closely with product, design, and engineering teams to plan features, solve technical challenges, and ensure applications are secure, performant, and maintainable.

• Lead technical discussions, perform code reviews, mentor junior developers, and contribute to engineering standards, architectural decisions, testing, and overall code quality.

• Continuously improve application performance, developer workflows, and engineering best practices within an Agile development environment.

Qualifications:

• 15+ years of experience developing modern web applications.

• Strong JavaScript & TypeScript across front and back.

• Deep React knowledge — modern hooks, Server Components, Client Components, server actions, state management.

• Experience shipping production Next.js (App Router), React and TypeScript today, not five years ago.

• Proven experience designing scalable software architectures, APIs, database models, authentication systems, and working with modern databases such as MongoDB using ORM technologies.

• Strong understanding of monorepo architectures, software design principles, testing, debugging, Git, and Agile development methodologies.

• Demonstrated experience mentoring engineers, leading technical discussions, performing code reviews, and making architectural decisions.

• Excellent communication skills, strong technical judgment, and the ability to collaborate effectively across cross-functional teams.

Preferred Qualifications:

• Experience with DevOps practices, Docker, Kubernetes, CI/CD pipelines, or cloud platforms such as AWS or GCP.

• Familiarity with real-time communication technologies, WebRTC, collaborative applications, or game engine technologies.

• Experience building highly scalable, production-grade web applications supporting large user bases.