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Ask HN: What Are You Working On? (Nov 2025)

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Re: Ask HN: What Are You Working On? (Nov 2025)

#235
Still hacking on some data tools:

DuckDB for stream processing:

https://github.com/turbolytics/sql-flow

Lightweight kafka stream processing using DuckDB as the execution engine. 300MiB runtime can easily handle thousands of messages / second.

Working on a Kafka Connect alternative:

https://github.com/turbolytics/librarian

Right now mongo replication (through changestreams) is supported to kafka. Working on Postgres support right now.

Re: Ask HN: What Are You Working On? (Nov 2025)

#236
Correct and performant way to calculate historical value of a portfolio. I want a pure function, but taking a date as input is insufficient because users can edit holdings, and securities can split.

Weighing the tradeoffs of doing this calculation server or client side. That'll be an architecture shift away from my current set of background jobs fetching state and towards something more functional and on-demand.

https://jch.app

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