A lending core rebuilt in nine months, without a day of downtime

Northbridge was originating on a loan management system written in 2013, extended by four vendors, with reconciliation running as an overnight batch that regularly failed.

Disbursal took six working days. The finance team rebuilt the regulatory return by hand each month, and the auditors had raised the reconciliation process two years running.

A rip-and-replace was commercially impossible: the book had to keep originating throughout, and no customer-visible interruption was acceptable.

We ran a six-week discovery across the codebase, the ledger and the operations floor, then proposed a strangler-fig migration rather than the rewrite two other vendors had quoted.

A new event-sourced ledger ran in parallel with the legacy core for four months. Every transaction was written to both and reconciled continuously, so divergence was caught in minutes rather than at month end.

Origination, underwriting and servicing moved product line by product line behind feature flags. Our finance practice designed the controls in parallel, so the audit trail was a design requirement rather than a retrofit.

Operations staff were trained on the new console two sprints before each cutover, and each migration was rehearsed twice against a production-scale copy.

The final cutover completed on a Tuesday afternoon with no customer-visible interruption and no rollback.

Disbursal moved from six days to under four hours for standard applications, and origination throughput rose 4.2 times on the same headcount.

Cost per disbursed loan fell 64%, and the following statutory audit closed with no material findings on reconciliation for the first time in three years.