Blog

Engineering notes

What it actually takes to ship iOS apps: speech and audio, Swift concurrency, testing, and running a solo product with Claude Code.

RSS › Scriptmate case study ›
September 30, 2026 10 min read

The retry that parsed and billed twice: idempotency for an LLM pipeline

Production failures in a Claude parsing pipeline on Cloudflare Workers: a retry that billed twice, a 429 disguised as a bad file, a 403 from Hong Kong.

  • Cloudflare Workers
  • Claude
  • Reliability
  • iOS
  • Backend
September 26, 2026 10 min read

Six months of Claude Code on a shipping iOS app: the rules, not the prompts

A senior iOS engineer's real setup for Claude Code on a shipping app: a CLAUDE.md written as an onboarding doc, 771 tests as the gate, an allow list that drifted, and a worktree sprint that half worked.

  • Claude Code
  • iOS
  • Swift Testing
  • Xcode
  • Engineering
September 26, 2026 11 min read

SpeechAnalyzer in production on iOS 26: stale finals, audio timestamps, and a bug that survived stop()

Three months of SpeechAnalyzer and SpeechTranscriber in a live iOS 26 app: the setup, the late final that fired cues early, the vocabulary API that fails silently, and why the simulator cannot test any of it.

  • Swift
  • Speech
  • iOS 26
  • AVFoundation
  • Swift Concurrency