Streamlit

I ship Python data apps quickly with Streamlit: clean UI, Altair charts, CSV/Parquet export, and robust back-end patterns including environment secrets, pagination and retries, SQLite caching, and small feature flags through query params.

• pandas transforms, input validation, and data quality checks.
• Altair v5 interactive charts and responsive layouts.
• Export buttons and friendly error handling.
• Lightweight deploys with clear configuration.