Andy M

Senior Software Engineer

Nov 2024 - Jun 2026 • 1 yr 7 mos

Designed and built internal processing logic for ISO 8583 financial messaging, including reversal advice handling, transaction matching, and balance adjustment logic across high-volume payment systems. Worked extensively with Python and AWS to build and maintain scalable infrastructure supporting card payment processing. Collaborated cross-functionally to translate complex payments domain requirements into robust, testable engineering solutions. Raised test coverage from 60% to 95%+ by introducing pytest/unittest as the team standard, significantly reducing regression risk. Architected and led delivery of a cross-border payments platform, taking it from concept to a working build before it was descoped after 6 months due to shifting business priorities. Designed a data-driven test framework for the debit transaction processor, using CSV-defined flow blocks so a non-technical product specialist could independently author and extend scenario coverage. Diagnosed and fixed bugs in core authorisation and presentment logic, protecting the accuracy of the platform’s payment processing. Mentored a QA engineer through to promotion to Software Engineer.

Software Engineer

Apr 2021 - Nov 2024 • 3 yrs 7 mos

Played a key role in redesigning a global reporting solution, replacing a legacy system built on SQL stored procedures with a modern C# and .NET Core API application. Led the team for 6 months, making key architectural and technical decisions to drive the project forward. Modernised reporting architecture to improve maintainability, scalability, and performance across regions and business lines.   Worked with large-scale financial transaction data to deliver accurate, timely reporting supporting operational and regulatory needs across multiple markets. Collaborated with cross-functional and international teams to gather requirements and ensure the new solution met diverse regional needs.