Field notes

Engineering write-ups, product decisions and what we learned shipping them.

Cloudflare AI Gateway adds managed web search for retrieval-augmented applications

Developers can inject real-time web context into model calls without custom middleware. No crawlers or indexers to run, and RAG answers stay current.

A & A Labs 7 Oct 2026 5 min read

Engineering

How DoorDash moved from vendor-first to open-weight models in its GenAI platform

Learn how DoorDash moved from vendor APIs to self-hosted open-weight models for cost control, data residency, and reusable evaluation.

A & A Labs 7 Oct 2026 5 min read

Messaging

Connecting the WhatsApp Business Cloud API to a shared inbox

Inbound WhatsApp messages arrive as signed webhooks from Meta. Acknowledge them within seconds, verify the signature, queue the work, and deduplicate on...

A & A Labs 23 Aug 2026 2 min read