Phase 3
Hardening
Stabilize the platform at scale — load testing for 40K users, security audit, disaster recovery validation, and documenting the Payment migration plan for the next phase.
6.5
Effective MM
M8–9
Duration
×1.0
AI Multiplier
6.5 MM
Raw Capacity
-4.0 MM
Overhead
6.5 MM
Effective
5
Services Live
AI Application in This Phase
What AI Does
AI-powered monitoring anomaly detection live. AI generates load test scenarios from production patterns. AI drafts API docs, runbooks, and Payment migration plan.
Expected Impact
Faster issue detection. Documentation 4x faster (AI generates from code). Payment migration plan ready for next phase without consuming implementation capacity.
Key Deliverables
✓Load testing simulating 40,000 concurrent users
✓Security audit and penetration testing
✓Disaster recovery validation (failover + restore)
✓Operational documentation and runbooks
✓Payment modernization plan for post-9-months
✓SLA monitoring and alerting verified
Week-by-Week Breakdown
| Period | D1 – Tech Lead | D2 – Sr Backend | D3 – Backend | D4 – Fullstack | D5 – FE/DevOps | Output |
|---|---|---|---|---|---|---|
| M8 W1–2 | Performance optimization (hotspots) | Load testing (40K users simulation) | Bug fixes + edge cases | React: performance optimization | Alerting rules tuning | Benchmarks identified |
| M8 W3–4 | Security audit + pen test fixes | Performance fixes from load test | Operational runbooks | React: accessibility (a11y) | Disaster recovery testing | Production-grade |
| M9 W1–2 | Architecture documentation | API documentation (OpenAPI) | Runbooks + incident playbooks | React: design system documentation | CI/CD optimization + monitoring docs | Docs complete |
| M9 W3–4 | Knowledge transfer + ADR finalization | Legacy decommission plan | End-to-end regression suite | User training materials | Capacity planning for next phase | Handoff ready |
Exit Criteria / Go-No-Go Gate
☐Load test passed: simulated 40K concurrent users, p95 < 200ms
☐Security audit: SAST/DAST clean, pen test findings resolved
☐Monitoring + alerting configured for all 5 services
☐Disaster recovery tested and validated
☐All OpenAPI specs published and accurate
☐Runbooks and incident playbooks complete
☐Payment modernization plan documented (Phase 2 roadmap)
☐Knowledge transfer complete — bus factor ≥ 2 for every service
Milestones (3)
M8
Load Testing Complete
40K concurrent users simulated. Performance bottlenecks resolved.
M9
Security Audit + DR Validated
Penetration testing complete. Disaster recovery failover tested.
M9
Handoff Complete
Operational docs, runbooks, Payment migration plan delivered.
Risk Notes
Phase 3 has low AI leverage (perf work, docs, hardening = 1.0x multiplier). Key risk: insufficient time for thorough load testing. If performance issues found → extend soak period, defer some documentation.