I have two datasets that must be reconciled. • Master catalogue: 300 k rows × 5 columns, each a unique medicine product. • Transactional file: 300 million rows, roughly 90 % medicine items. My goal is to match every medicine record in the large file to its counterpart in the master list... (Budget: ₹37500 - ₹75000 INR, Jobs: Big Data, Data Analysis, Data Cleansing, Data Mining, Data Processing, Data Science, Machine Learning (ML), Pandas, PySpark, Python)