How long does it take to build a production AI agent?

A production AI agent for a SaaS product takes 4 weeks to ship when built by an experienced solo design engineer. That's the AI Agent Sprint timeline on surinder.design: week 1 discovery and prompt architecture, week 2 agent core and first integration, week 3 UI and edge cases, week 4 production deploy and founder training.

The four-week timeline is built around AI-native scope, not generic web app scope. It assumes one agent (not three), one primary integration (not five), and a founder who can answer questions and make decisions inside a 24-hour loop. With those assumptions, four weeks is realistic — and it's been the actual delivered timeline on every Sprint engagement to date.

Week-by-week breakdown: Week 1 — user interviews, prompt architecture decisions, model selection, and a working v0 agent against real input. Week 2 — backend integration (your DB, your API), retrieval if needed, basic memory. Week 3 — UI layer in React, edge cases, refusal behavior, error states. Week 4 — production deploy to your repo, founder onboarding, 30-day post-ship support window opens.

Longer engagements (AI App Foundation, 8–12 weeks) are for multi-agent architectures, deeper integration with an existing product, or when the team handoff and documentation phase is substantial. The right tier is decided in a 30-minute scoping call.