This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Platform Backend Engineer based in Canada. This is a senior backend engineering opportunity focused on building the cloud platform behind a browser-based, real-time 3D creation experience.You will design and operate highly scalable services supporting real-time collaboration, publishing pipelines, content delivery, and platform APIs.The role combines distributed systems engineering, cloud infrastructure, API design, reliability, and production ownership.You will work closely with engineers, product managers, and designers to turn complex and ambiguous problems into reliable, customer-facing solutions.As a senior contributor, you will influence technical direction, improve engineering practices, and mentor other engineers.The environment is fast-moving and collaborative, with an emphasis on shipping iteratively while maintaining strong reliability and observability.Experience with real-time, multiplayer, gaming, or interactive 3D systems is particularly valuable but not essential.