Big Data Conversion to Parquet

I need an experienced big data specialist to convert 5 TB of flat JSONL data stored in an S3 bucket on AWS into Parquet format with modulo hashing for optimized query performance.

Requirements:
- Use AWS EMR for the conversion
- Handle flat JSON (key-value pairs) structure
- Implement specific field hashing as per my requirements

Ideal Skills and Experience:
- Proficient in AWS EMR
- Strong background in data format conversion
- Experience with JSONL and Parquet
- Knowledge of modulo hashing and query optimization

Please provide a detailed approach and timeline.