Banking & Payments Technology Expert Witness: When Financial Systems Fail, Fall Short, or Are Misrepresented
Practitioner analysis of banking, payments, and enterprise financial systems, benchmarked against ISO 20022, ISO/IEC, and FFIEC standards.
Financial Systems Are Built Under Rules. Disputes Turn on Whether the Rules Were Followed.
Bruce Weiner is a banking and payments technology expert witness. Banking, payments, and enterprise financial systems carry obligations that ordinary software does not: messaging standards, settlement finality, books-and-records accuracy, regulatory examination expectations, and vendor accountability. When an implementation fails, a migration stalls, or a platform does not do what was represented, the answer turns on how the system was selected, configured, built, tested, and run.
At the Federal Reserve Bank of New York, Bruce was the product/transformation lead for the Markets Group transition to the ISO 20022 standard for its payment hub, supporting cross-border payments between Fedwire and SWIFT, covering vendor management, business testing and operational readiness, and technical development, testing, and rollout. Earlier, as Vice President of Technology at American Express and a Principal at First Manhattan Consulting Group, he worked on card, small-business banking, and banking technology for financial institutions.
Since 1988 he has selected, implemented, and run enterprise platforms, including BPM, ERP, financial and books-and-records systems, and retail and online banking and payments, and he applies that practitioner experience to the record in dispute.
Disputes Addressed
- Core banking and internet banking implementation failures
- Payment system migrations and messaging-standard conversions (ISO 20022, Fedwire, SWIFT)
- Enterprise platform disputes: BPM, ERP, financial and books-and-records systems
- Vendor performance, statement of work, and service level disputes
- Reasonableness of technology consulting time and billing
- Trade secret disputes involving financial technology
- Trademark and domain disputes in internet banking
- Direct technical cost and financial impact of system failures or misuse
Analytical Approach
Establish What Was Promised
Contracts, statements of work, RFP responses, specifications, and demonstrations establish the capabilities and obligations that were represented.
Reconstruct How the System Was Built and Run
Configuration records, release notes, test evidence, defect logs, and production incidents show what was actually delivered.
Benchmark Against Financial-Services Standards
ISO 20022 messaging, ISO/IEC/IEEE 12207 lifecycle processes, ISO/IEC 25010 quality, and FFIEC examination expectations provide objective measures.
Separate Vendor and Client Responsibilities
Distinguish vendor performance from client decisions, data quality, and change requests.
Trace Causation and Impact
Link the evidence to the outcome at issue, including the direct technical costs where relevant.
Standards Applied
| STANDARD | APPLICATION |
|---|---|
| ISO 20022 | Financial services messaging standard for payments, securities, and cash management |
| SWIFT CBPR+ | Usage guidelines for ISO 20022 cross-border payments |
| ISO/IEC/IEEE 12207:2017 | Software lifecycle processes |
| ISO/IEC 25010:2023 | Software product quality model |
| FFIEC IT Handbook | Development, Acquisition, and Maintenance booklet: regulator expectations for bank technology |
| NIST CSF 2.0 | Cybersecurity governance for financial systems |
| PMBOK | Project Management Body of Knowledge: planning and governance |
| ISO 20700:2017 | Management consulting guidelines: deliverable and billing substantiation |
Relevant Credentials & Experience
- Led the Federal Reserve Bank of New York Markets Group transition to the ISO 20022 standard for its payment hub (Fedwire and SWIFT)
- Speaker, Sibos 2025, Frankfurt: “ISO 20022 Journey to CBPR+ and Beyond”
- Vice President, Technology, American Express (card and small-business banking services)
- Principal, First Manhattan Consulting Group: banking and credit card technology for financial institutions
- Managing Director, Novantas: technology due diligence ($1–$5B) for private equity and venture capital firms
- Testifying expert, Bank v. Global Banking Software Company (arbitration): installation of core and internet banking software; live hearing testimony
- Testifying expert, ConnectOne Bankcorp, Inc. v. Star City Bancshares, Inc. (E.D. Ark.): internet banking trademark dispute
- Testifying expert, Abbott Building Systems LLC v. National Grid USA Service Co. (E.D.N.Y.): technology consulting services and billing
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