Senior Backend Engineer, AI Platform

This position is listed on behalf of a partner company, which manages all applications and next steps. Our partner is looking for a Senior Backend Engineer, AI Platform based in the United States. This is an opportunity to build the core AI infrastructure powering a digital platform used by millions of people. As a Senior Backend Engineer, you will work closely with platform architects and engineering teams to design, develop, and scale production-ready AI capabilities from the ground up. You will bring deep expertise in large language models (LLMs), retrieval-augmented generation, model serving, and reliable backend architecture to deliver practical AI features at scale. The role offers significant technical ownership, from system design and API development to deployment, monitoring, and ongoing production support. You will help establish engineering standards, improve AI quality and reliability, and shape the platform's evolution as the team grows. This is a full-time, remote opportunity for a US-based engineer who enjoys solving complex technical challenges in a fast-moving environment.