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6. Runtime View

This section describes key runtime scenarios that illustrate how PSSaaS processes requests and manages workflows. For a comprehensive view of all workflows in the legacy system, see the Legacy Workflow Map.

6.1 Best Execution Analysis Flow​

The BestEx engine is the core differentiator — a 24-step pricing analysis that determines the optimal execution path for each loan.

Key Characteristics​

  • Single loan pricing must complete in under 3 seconds
  • Batch analysis (1,000 loans) must complete in under 30 seconds
  • Results are cached but invalidated when rate sheets update
  • All LLPA calculations must match the desktop app output exactly

6.2 Trade Settlement Flow​

Trade settlement is the process of finalizing a trade commitment — designating loans, confirming with the investor, and settling.

6.3 Pooling Engine Flow​

The pooling engine uses a constraint-satisfaction algorithm to optimally group loans into pools for agency delivery (Fannie Mae, Freddie Mac, Ginnie Mae).

6.4 Tenant Resolution Flow​

Every request must resolve to a tenant context before any business logic executes.