Blog

Building a Parquet-backed data API, end to end

An HTTP API over a single Parquet file: polars scan_parquet per request, tests that never touch the real data, and a Railway deploy. Plus a follow-up to my last post, where the page cache that makes local reads fast turns out to be billed as memory.

[dev]

How to Add Login and a Paywall to a Streamlit App

Using Stripe + Streamlit for a simple paywalled application

[dev]

Why Reading Parquet from S3 Is Slow (Even In-Network) and What I Did Instead

S3 in-network reads still have a ~300ms latency floor. Downloading parquet files to ephemeral disk at startup gave me local-disk speeds (~3ms) for free on Railway.

[dev]

Integrating Pydantic AI with Streamlit: Async Challenges and Fragment Optimisations

Trying to use Streamlit's nice chat UI with Pydantic AI

[dev]

Building a Caching System with FastHTML

Enable high performance dashboards/APIs by caching precomputed recent data.

[dev]

Triggering Multiple Routes from a Single Form - FastHTML & HTMX

Using hx-trigger and hx-include to improve page load times etc.

[dev]