# Nick Karpov's Blog

> Personal blog about data engineering, streaming systems, and AI.

## Posts

- [RIP flatMapGroupsWithState](/2025/transform-with-state/) - 2025-02-27
- [Token Alchemy](/2025/token-alchemy/) - 2025-03-06
- [Hacking Delta Lake MERGE with UDFs and Accumulators](/articles/hacking-delta-lake-merge-udf-accumulator/) - 2024-04-10