LLM (AI) ChatGPT specialist

We are looking for an experienced ChatGPT AI (LLM) developer. You would be building new functionality into our existing platform that already includes a mobile app that our customers' employees use. We want to create a chatbot that would allow the employees to ask HR related questions (from the mobile app) and the chatbot would reply based only on the policy PDFs that our customers had uploaded. We are looking for someone who has a lot of experience working with AI services like Chatgpt and LLMs in general.