Help Needed Running Prompts on Huge TXT Files

If this task can be completed, along with payment I will provide a very positive review along with potential future works with higher budgets. So I have several large TXT files containing a lot of data, and I need someone who can help run a detailed prompt over them to analyze the full contents and output structured results. Each of the files are very large, around 500MB - 1 GB each, so I need someone who knows how to handle long text files efficiently without missing important sections. I am looking for someone familiar with tools, apps, scripts, or AI workflows that can process large TXT files, scan the entire document, apply a prompt, and return clean analyzed output. The ideal person may have experience with: -Large text file processing -AI prompt workflows -Python scripts or automation tools -Chunking large files without losing context -Producing structured outputs from messy text -Using tools like OpenAI API, Claude, local LLMs, LangChain, or similar systems The main goal is to find a fast and reliable way to analyze huge TXT files using a custom prompt and generate useful output from the full content. Please apply only if you have experience working with very large text files and know how to process them efficiently.