OpenAI API Fine-Tuning for English Understanding

I'm looking for a developer who can fine-tune the OpenAI API to better understand the English language, specifically focusing on enhancing language understanding and generate a result based on the CEFR.

Key Tasks:
- Enhancing the language understanding capability of the OpenAI API specifically for the English language based on previous texts generated by students.
- Improving the overall performance of the API when it comes to grading English text.

Ideal Skills:
- Extensive experience with the OpenAI API and its fine-tuning capabilities.
- Strong background in natural language processing (NLP).
- Proficiency in handling large datasets to train and improve AI models.
- Excellent understanding of the English language and its nuances.