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upwork.com 🟡 2026-05-14

🔹 CSV Data Matching & Automated Validation Tool
👤 Client: 🇨🇦 Canada Member since 2014-03-23
💰 Price: $25
🚩 Problem: Automate the process of comparing multiple smaller CSV files against a larger master CSV to update specific fields.
📦 Existing: **- One large CSV file (~20,000 records)

• Several smaller CSV files (~2000 rows each)**

Specifications:

[Target] - Python script for data processing
[Method] - Automated comparison and field updates
[Stack] - Python (Pandas library recommended)
[Format] - CSV

Workflow:

1. Load the main CSV file into a DataFrame.
2. Iterate through each smaller CSV file, loading them into separate DataFrames.
3. Use unique identifier columns to match records between the main and smaller files.
4. Update specific fields in the main CSV based on matches found.
5. Save updated main CSV.