Nine AI features. One production SaaS. Zero hallucinated data in the user's face.
That last part is harder than it sounds.
This is a full technical breakdown of how I designed, built, and shipped nine Claude Haiku features into CitizenApp — a GDPR-compliant citizen management platform. I'll cover the architecture, the security decisions, the failure modes I had to defend against, and what I'd do differently.
Why Haiku, Not Sonnet or Opus
Every AI feature in CitizenApp uses claude-haiku-4-5. The reasoning was deliberate:
