On January 15, 2025, Capital One experienced a significant outage, impacting thousands of customers who were unable to access deposits, balances, or essential banking services. The root cause? A technical glitch tied to the bank’s third-party core processing vendor. This incident exposes the dangerous flaws in outdated banking systems.
The Capital One outage underscores the urgent need for resilience and redundancy across banking infrastructure, especially as transactions and services shift to 24/7 operations. Let’s explore how a parallel core system could have prevented this disruption and eliminated the single point of failure.
What is a Parallel Core?
A parallel core is a cloud-based, API-first, modern processing system that runs alongside legacy core systems, offering two key benefits: unified payment processing and core-independent deposit accounting.
- Unified Payment Core: The parallel core integrates all payment rails—ACH, FedWire, RTP, and FedNow—into a single, unified system, eliminating reliance on legacy infrastructure. This ensures seamless transaction processing across various payment types without interruption.
- Core-Independent Deposit Core with Real-Time Accounting: Powered by a virtual ledger, the parallel core offers a flexible and resilient solution for managing deposits. It can maintain deposit products and accounting either paired with the legacy core’s DDAs or independently on the parallel core itself, ensuring uninterrupted banking operations 24/7.
Three Ways a Parallel Core Could Have Saved Capital One
Given that the Capital One outage stemmed from an issue in the legacy core system, how could a parallel core have mitigated or avoided the disruption? Here are three potential approaches:
1. Make the Parallel Core the Primary System
One option would have been to switch to the parallel core as the primary system for all payment processing and transaction accounting. The legacy core would then serve as the system of record, managing high-level data but not handling daily transactions.
Why It Would Have Worked:
- No Single Point of Failure: If the legacy core had gone down, the parallel core would have continued operating without interruption, processing real-time payments and maintaining accurate transaction records.
- Independent Accounting: Even during an outage, the parallel core would have maintained up-to-date transaction records.
2. Run Both the Legacy Core and Parallel Core in Tandem
Another approach would have been to run both cores concurrently, with an orchestration layer managing which system processes each transaction based on the bank’s rules. The parallel core would handle instant payments, while the legacy system could process more routine transactions— a surround and shrink approach. Many large banks are now turning to modern parallel cores to handle payment processing.
Why It Would Have Worked:
- Redundancy and Flexibility: Critical payments and accounting tasks would be handled by the more resilient parallel core.
- Failover Capability: If the legacy core failed, the orchestration layer would reroute transactions to the parallel core.
3. Use the Parallel Core Exclusively as a Failover Solution
The third approach would have been to use the parallel core only as a failover system, activated solely when the legacy core encountered an issue.
Why It Would Have Worked:
- Instant Failover: The parallel core could have instantly assumed control in the event of a failure.
- Independent Transaction Accounting: The parallel core would have maintained accurate transaction records.
- 24/7 Availability: Built to handle 24/7 payments, the parallel core would prevent any disruptions to customers.
The Bigger Picture: Addressing the Single Point of Failure
The Capital One outage highlights the significant risks posed by single points of failure in payment systems. In an environment where real-time payments are becoming the standard, relying on outdated systems is no longer viable.
Parallel cores offer a way to decouple payment processing and transaction accounting from the legacy core, providing redundancy, flexibility, and resilience. By considering parallel core solutions—whether through full migration, dual processing, or failover systems—banks can build a more resilient infrastructure that ensures seamless operations, even during system failures.
The author, Booshan Rengachari is Founder and CEO at Finzly.