Blog
Notes on things I'm building or trying to understand. Mostly ML, finance and Python.
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2 posts tagged 'railway'
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2026-06Building 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]
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2026-04Why 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]