Zero-Defect Modernization: Embedding Shift-Left Quality into a Leading Payment Processor's Oracle Migration Program

For a U.S.-based payment processor, authorization and settlement systems sit at the center of merchant revenue and customer trust. As the organization prepared to migrate core systems from legacy Oracle platforms to a modern cloud architecture, the tolerance for error was effectively zero. The platform had to meet 99.99% availability, PCI-DSS standards, and Visa/Mastercard testing mandates.

Client Challenges and Requirements

• Authorization defects directly impacted merchant revenue — high First Defect Rate in authorization flows increased risk of transaction failures.
• Defects were often discovered late in the delivery cycle — traditional testing identified issues during later QA stages.
• Migration pressure amplified risk — moving core authorization and settlement systems required strict coordination.
• Quality ownership was fragmented across teams — siloed testing limited early visibility into defects.

Bitwise Solution

• Embedded quality validation directly into day-to-day development workflows with unit tests before code commits and automated integration tests on every build.
• Implemented test automation frameworks validating high-risk transaction paths including authorization, settlement, chargeback, and network compliance scenarios.
• Reduced First Defect Rate and improved release predictability through continuous quality controls.