Senior Backend Engineer, AI Platform

Senior Backend Engineer, AI Platform Remote — US only · Full-time Are you passionate about building AI products people actually use, serving millions of users? Do you want to help lead the AI engineering effort at this country's fastest-growing social media company that champions free speech? You'll be building AI-based features into a platform serving millions of users.

About the Role You'll work directly with the platform architect and other developers to bring deep, hands-on LLM-stack expertise: you've built these systems before, you know where they break, and you know what "good" looks like in production. The work is greenfield. You won't be maintaining someone else's pipeline — you'll be standing up the core AI infrastructure for a platform with millions of active users, and shaping the engineering practices around it as the team grows.

What We're Looking For 5+ years of backend engineering experience in a statically typed language (Go, Java, Kotlin, C#) You've shipped production LLM-backed features — retrieval-augmented generation, streaming responses, tool use — and lived with them after launch Hands-on experience with the LLM serving stack: routing across multiple model providers, failover, token streaming, and cost/usage metering Experience building retrieval systems: vector search, embedding pipelines, context assembly, and citation-backed answers You think in failure modes: hallucination, retrieval misses, provider outages, cost blowouts — and you build the instrum