> Survey Researchers

Drive a real browser to fill forms, scrape data, or test flows. Vision + DOM hybrid.

Create, read, and edit Excel spreadsheets (.xlsx, .xlsm, .csv) — formulas, charts, formatting included.

Production web scraping via Firecrawl. Handles JS sites, anti-bot, rate-limits.

Polars DataFrames — lazy evaluation, expressions, joins, window functions, the fast Pandas alternative.

Local analytics on Parquet/CSV/JSON with DuckDB. Window functions, joins, no-server data prep.

Build .xlsx files: formulas, conditional formatting, pivot tables, charts — typed and tested.

Generate, modify, and execute Jupyter notebooks. Handles kernels, magic commands, data viz.

Write, explain, and optimize Postgres/MySQL queries with indexes and EXPLAIN analysis.