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Engineering blog

Notes from the gateway.

What we are building, what broke, what we learned. Long-form technical writeups about LLM billing, multi-provider routing, observability, and the practical parts of running an OpenAI-compatible gateway in production.

Engineering23 May 2026 · 10 min read

Why our SDK ships only metadata: privacy by architecture

The fields the SDK sends on the wire, the ones it deliberately does not, how cost is computed without seeing the prompt, and the GDPR / LGPD implications of a database that cannot leak content.

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Engineering16 May 2026 · 12 min read

Designing a double-entry ledger for an LLM gateway

Hold/capture/release, idempotency under streaming, orphan cleanup, and the four iterations it took to charge customers for upstream usage without double-spending or leaking holds.

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More writeups coming.

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