What actually happens inside a 4-week MVP build, week by week.

Week 1: architecture locked, Figma screens approved, no code until design is signed off.
Week 2: backend live = APIs, auth, database, core logic.
Week 3: frontend built from approved screens, backend integrated, agentic QA running continuously.
Week 4: performance testing, security review, production deployment, full handoff = source code, documentation, deployment guide, everything. No cut corners. The AI tooling eliminates the time-wasting parts = scaffolding, manual test writing, repetitive documentation. Engineers stay on decisions that matter.

Has anyone here done a 4-week build? What actually held the timeline?