Diagnoses and corrects loan boarding and servicing errors at their root cause, including misapplied payments, incorrect interest accruals, failed rate changes, billing and notice errors, escrow miscalculations, participation mismatches, and GL variances; quantifies customer and financial impact, processes corrections and customer remediation, and documents the resolution. Expert-level command of Fiserv DNA loan functionality - account boarding, product and parameter setup, rate and index tables, payment and billing schedules, interest accrual, fees, escrow, participations, collateral, GL mapping, and loan-related nightly processing.