Ledger and treasury for a mid-market lender

Meridian's book was spread across eight systems: a core banking platform for lending, a bolt-on treasury tool, a spreadsheet for FX exposure, and five downstream reports that never agreed with each other.

The risk desk was hand-reviewing four hundred exposures every week. Reconciliation took three days at month-end. The auditors were losing patience, and the underwriters were making pricing decisions on data that was already 24 hours old.

Meridian didn't need a new front-end. They needed a real operating spine, one that could handle capital movement at production quality without an army of analysts holding it together.

We built an event-sourced ledger in Go with Kafka as the transport, Postgres as the read-side, and a compliance-grade audit log baked in from the first commit. Every entry is traceable, every rollback is safe, and every downstream report reads from the same numbers.

The treasury and risk workflows moved onto the same spine. Exposure now updates the instant a facility funds. FX positions revalue as the market ticks. The underwriters see the price of a new loan against the portfolio in real time.

We ran the new platform alongside the legacy stack for four months, reconciling every entry, before Meridian cut over. The switch happened on a Sunday. Monday morning, nobody noticed anything except the reports being early.

Reconciliation runs unattended and closes before the analysts arrive. Risk exposure is visible in real time. The audit cycle went from six weeks to two, and passed with no adjustments.

Eight legacy systems retired. Two full-time reconciliation roles freed up for actual analysis. Underwriting can now price a loan against live portfolio numbers instead of yesterday's snapshot.

Meridian's regulator called it "the cleanest audit trail we've reviewed this year."