Blog
Notes on fintech systems, data pipelines, and pragmatic AI.
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Idempotency isn't optional in fintech systems2026-05-15
Why every money-moving endpoint needs an idempotency key—and what breaks when you skip it.
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Designing a ledger wallet: auditability first2026-05-01
Why a balance column isn't enough—and how double-entry thinking pays off in debugging and compliance.
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Pragmatic RAG: moving data safely between services2026-04-18
Combining services with retrieval-augmented generation—without leaking data or hallucinating answers.