Senior Full Stack Engineer, Client Platform

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Full Stack Engineer, Client Platform based in Canada. This is a senior full-stack engineering role focused on enabling product teams to build and deliver high-quality digital experiences efficiently. You will work across shared front-end libraries, design systems, developer tooling, and a server-driven UI platform. The role combines React and TypeScript development with backend GraphQL engineering and API design. You will help shape the contracts that power web and mobile experiences while ensuring performance, accessibility, observability, and reliability. The position involves solving complex technical challenges within a large monorepo and distributed service environment. You will also contribute to architecture, technical standards, testing practices, and mentoring in a collaborative Agile team.