Kyle Bown.

Write path — ingestion

Breach dumps arrive as whatever the leaker happened to export. The pipeline's job is to turn that into something a query can trust — without ever leaving the data readable.

1. Detect the schema

   A Rust extension bound into Python through PyO3 works out the shape of an unknown dump at 50–100 MB/s. SQL, JSON/NDJSON, CSV/TSV, XML, combo lists and raw text all enter the same funnel.

2. Map and extract

   An operator confirms the field mapping in the React console. SQL is split per table by the Rust parser and extracted in memory, so no staging file ever hits disk.

3. Encrypt before it lands

   Associations are AES-256 encrypted on the way in and emails are keyed by SHA-256 hash. The corpus stays searchable without being decrypted, so a lookup never handles plaintext.

4. Write in batches

   Records land in the store as 500,000-row columnar batches. Work is dispatched to a worker fleet through a Redis queue, with live progress streaming back over WebSockets.

5. Replicate and tier

   One shard across three replicas, with Raft handling consensus. Emails and associations are aggregated and replicated across 64 partitions, tiering out to cold object storage once a node passes 90% capacity.

Request path — synthesis

A script is rarely written once. It gets tweaked, re-recorded, a name changed, a line dropped — and a naive pipeline re-synthesises the whole thing every time.

1. Split the script

   An SSML script can switch voice mid-sentence and carry breaks, prosody and phoneme overrides. The segmenter breaks it into per-voice segments and fingerprints each one, so a segment is the unit of work — not the request.

2. Look up each segment

   Every segment is checked against object storage by content hash. Because the cache is keyed per segment rather than per response, an untouched sentence in an edited script is never synthesised twice.

3. Synthesise only the misses

   Only segments with no cache entry reach the speech provider; the rest are served straight from storage. That is what keeps synthesis spend proportional to what actually changed, rather than to how often someone hits render.

4. Mix and render

   FFmpeg handles format conversion, and auto-ducking mixes speech over background music through a fallback chain — a failed analysis degrades to a simpler mix instead of failing the render outright.

5. Keep it standing up

   A circuit breaker, per-IP rate limiting and host allow-listing sit in front of the service. Cache reads and writes can be killed cluster-wide from an operations console without a redeploy, and a contract suite pins the public API's observable behaviour so it can be refactored without breaking consumers.