The AI Engineer Title Has Settled Around the LLM Stack Two years ago, "AI Engineer" was a fuzzy keyword that could mean almost anything: an ML researcher, a data scientist with a Python script, a backend engineer who fine-tuned a model once. In 2026 it has settled into a much more specific job: take a foundation model, wrap it in retrieval, monitoring, and an API, and ship it into a product. The variance lives in which model provider, which vector store, and which orchestration framework, not in what the work is. To put numbers on it, we looked at every active AI Engineer posting on the InterviewStack.io job board as of May 2026, 3,449 listings, with skills extracted from descriptions and synonyms collapsed (so gen ai and generative ai count once, gcp and google cloud count once). The headline: an AI Engineer posting in 2026 is, on average, a Python job plus an LLM job plus a retrieval job plus a cloud job rolled into one.…