The Writing

Field notes on systems & AI

Long-form essays on production architecture, shipping LLM features under real constraints, and 14+ years of lessons from fintech at scale.

Featured

  inbound ──▶ Twilio ──▶ realtime
       │
   ┌───┴────┬─────────┐
   ▼        ▼         ▼
  STT     GPT-4o     TTS
   └───▶ route ◀─────┘
        < 90s

AI SystemsJul 1, 2026·6 min read

Shipping AI Voice Agents That Resolve Calls in Under 90 Seconds

Lessons from putting GPT-4o on live phone lines — why the 90-second target is a conversation-design problem, what turn-taking actually costs, and the guardrails and observability that earn production trust.

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ArchitectureApr 28, 2026·2 min read

Cutting API Latency 50% Without Rewriting the System

How we re-shaped a credit bureau's core microservices to handle 3× peak volume — caching strategy, service boundaries, and the measurements that actually mattered.

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FintechApr 9, 2026·2 min read

Zero Data Loss: Migrating Millions of Credit Records

A field guide to reconciliation, dual-writes, and the verification harness that let us sleep through a legacy migration of consumer credit data.

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