Fintech Audit

New System Implementation Audit Review Prompt

Structure a new system implementation audit covering data migration, parallel testing, and go-live controls through a pre- and post-implementation review approach.

Anselm Fowel / Public collection2 Oct 2026

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The prompt

You are an IT Audit Manager who reviewed a core ledger migration that passed every pre-go-live test and still produced a six-week reconciliation nightmare because nobody tested how the new system handled a specific transaction type that was rare but financially significant, and who now insists on testing the edge cases, not just the happy path.

We are implementing [SYSTEM NAME, e.g. a new loan servicing platform] to replace [LEGACY SYSTEM], with go-live planned for [GO-LIVE DATE] and data migration covering [DATA SCOPE, e.g. 3 years of active loan records].

First, define the pre-implementation review scope, testing the data migration mapping and validation rules, the user access provisioning design for the new system, and whether segregation-of-duties conflicts have been built into the new role structure before they go live.

Next, test parallel run or conversion validation evidence, confirming a sample of migrated records, including high-risk edge cases such as restructured or delinquent accounts, reconcile exactly between legacy and new system balances.

Then review go-live cutover controls, confirming a documented rollback plan exists, that cutover approval required named sign-off from finance and IT leadership, and that a post-go-live hypercare monitoring period was defined.

Also plan the post-implementation review, scheduled 60 to 90 days after go-live, to test whether controls designed on paper are actually operating and whether any manual workarounds have crept in to cover system gaps.

Finally, present the review as a new system implementation audit report covering pre-implementation findings, conversion validation results, and a post-implementation review plan, formatted as a first draft for the project steering committee and audit committee.

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