A FastAPI developer is a Python back-end engineer who builds APIs with FastAPI, a modern framework based on type hints, Pydantic validation and asynchronous request handling. FastAPI generates OpenAPI documentation automatically and is a common choice for high-throughput services and for serving machine learning and LLM features.
Uvik Software, for example, places FastAPI developers who also know when Django or Flask is the better tool, so the choice serves the product rather than the trend.