John Nguyen is an experienced professional in solutions engineering and management with a strong background in digital payments and project implementation. Currently working at Citi as part of the Solutions Engineering team for Spring by Citi since September 2025, John previously held multiple roles at Checkout.com from September 2019 to July 2025, including Senior Manager in both Crypto Solutions Engineering and Solutions Engineering. Prior experience includes serving as a Senior Implementation Manager at Worldpay from August 2015 to September 2019, and as a Technical Account Manager at both Visa from June 2013 to August 2015 and Fiserv from June 2010 to June 2013. Notably, at Visa, John managed digital payment initiatives and developed customized solutions for clients, while at Fiserv, John directed project implementations and enhanced operational efficiency. John graduated from San Francisco State University.
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