LLM and DataSet for Job Interview questions & answers

We have built a system to generate job interview questions and answers from ChatGPT for all technical skills. We want to replace CHatGPT with custom open source LLM like Llama2 or Mistrel.
CAn anyone suggest a good LLM for this project?
Can we take any base LLM and get dataset to train the LLM for generating job interview questions and answers.
We also want LLM to score and compare the answer given by LLM and answer given by the candidate.

Please contact me at taj@haslani.com if you can help in anyways.

Ultimately we want open source LLM to generate job interview questions, answers and perform scoring of answers.

Thanks in advance.

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