🔨 Phase 3 Playbook — Build & Iterate

Duration: 2-12 weeks (varies by scope) | Agents: 15-30+ | Gate Keeper: Agents Orchestrator

---

Objective

Implement all features through continuous Dev↔QA loops. Every task is validated before the next begins. This is where the bulk of the work happens — and where NEXUS's orchestration delivers the most value.

Pre-Conditions

• Phase 2 Quality Gate passed (foundation verified)
• Sprint Prioritizer backlog available with RICE scores
• CI/CD pipeline operational
• Design system and component library ready
• API scaffold with auth system ready

The Dev↔QA Loop — Core Mechanic

The Agents Orchestrator manages every task through this cycle:

FOR EACH task IN sprint_backlog (ordered by RICE score):

  1. ASSIGN task to appropriate Developer Agent (see assignment matrix)
  2. Developer IMPLEMENTS task
  3. Evidence Collector TESTS task
     - Visual screenshots (desktop, tablet, mobile)
     - Functional verification against acceptance criteria
     - Brand consistency check
  4. IF verdict == PASS:
       Mark task complete
       Move to next task
     ELIF verdict == FAIL AND attempts < 3:
       Send QA feedback to Developer
       Developer FIXES specific issues
       Return to step 3
     ELIF attempts >= 3:
       ESCALATE to Agents Orchestrator
       Orchestrator decides: reassign, decompose, defer, or accept
  5. UPDATE pipeline status report