Choose an incremental modernization path using the Strangler Fig pattern.
Modernization Billing is too risky to rewrite in one cutover, but too painful to leave untouched. The team needs visible progress without betting the quarter on a hidden branch. The strangler move Wrap -> route -> compare -> retire The new system earns traffic slice by slice while the legacy system remains the safety net. Rewrite cliff All risk lands on one launch date. Incremental migration with fallback and measurement. Replace behavior at seams, not the entire system at once. 01 Seam 02 Route 03 Retire Pick the slice The team can start with invoice PDFs, tax calculation, payment retries,…
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