Can you tell about the most complex technical problem you faced and how you overcame it?

Once I needed to optimize a script for processing large CSV files that was running too slowly and consuming a lot of memory.

I decided:

• To use generators for line-by-line data processing to avoid loading the entire file into memory.
• To apply the pandas module for efficient data handling, but with chunked reading (chunksize).
• To parallelize processing using the concurrent.futures module.

As a result, the script became significantly faster and used less memory, allowing me to process files several gigabytes in size without crashes.