# Patrick J. > Experienced Technical Leader - Payment Solutions, Python, Java, Machine Learning, AWS, AI Location: Berkeley, California, United States Profile: https://flows.cv/patrickj Accomplished Technical Architect and Senior Software Engineer. Expert in developing payment architectures with APIs like Adyen, Stripe, and Wise, and skilled in backend development and cloud computing. Holds an MBA and Master's in Computer Science, combining technical expertise with strategic business acumen. Known for innovative problem-solving and leading multinational teams in dynamic environments. ## Work Experience ### Senior Software Engineer @ Luminary Cloud Jan 2024 – Present | San Mateo, CA Optimized Snowflake data warehouse views and tables to improve customer usage visibility and reporting capabilities. Led technical migration of Auth0 post-authentication from Rules to Actions, modernizing security infrastructure and improving maintainability. Developed user-facing usage analytics features in the web application (Typescript/Go), enabling customers to monitor and optimize their consumption patterns. Implemented API key authentication system for the Python SDK, enhancing security and developer experience for programmatic access. Migrated UI tutorial content to Python SDK-based implementation, improving developer onboarding and documentation accessibility. Designed and built proof-of-concept for CFD simulation workflow orchestration using Prefect, with YAML-based schema definition and Python workflow creation. Architected solution inspired by industry tools like Pipedream, Windmill, Stripe Workflows, and Zuora Workflows. Architected and developed updates to the billing system (Python/Go) to support a new unlimited subscription model, enabling flexible pricing strategies and improved customer value. ### Senior Technical Architect @ Zoom Jan 2021 – Jan 2024 | San Francisco Bay Area Specialized in designing sophisticated payment architectures, integrating a diverse array of payment methods to streamline and enhance our financial operations. Prototyped solutions in Python and Java to ensure their effectiveness. After leading the implementation for Apple Pay and Google Pay using the Adyen API and front-end components, as well as incorporating SEPA debit, and realizing that Zoom was not able to release new payment methods quickly enough, I designed a payment orchestration architecture which allowed Zoom to release Japanese bank transfers (Furikomi), Sofort, iDEAL, Klarna, and ACH quickly (66% faster). This architecture interfaced seamlessly with Zuora for billing, and integrated with Stripe and Adyen for diverse payment processing. This multifaceted approach not only broadened Zoom's payment capabilities but also significantly improved the efficiency and reliability of financial transactions, catering to a global customer base and enhancing user experience. ### Chief Technologist @ BizSimplicity, Inc. Jan 2021 – Jan 2021 BizSimplicity (https://www.bizsimplicity.com/) helps local businesses find best-fit clients. - Architected and built the backend in AWS (Cloudfront, Route 53, API gateway, Python Lambda, DynamoDB) -Integrated with Braintree API (payment) and ESRI API (geodata) -Built the website using Angular 9 -Hired contractors for web design / graphic design -Created the SuperLocalPro iPhone/iPad app using Swift and the ESRI ArcGIS API ### Architect/Technical Lead @ Moda Health Jan 2018 – Jan 2021 - Architected REST APIs (Spring Boot) for dental benefit information used by internal and external clients - Architected REST API (Spring Boot) for Explanation of Benefits (EOB) used by multiple web applications - Implemented migration to Azure DevOps for web application team (Git, Python) - Provided training and guidance for web development team and management ### Architect/Technical Lead @ Nomura Jan 2016 – Jan 2018 | Tokyo, Japan - Architected a replacement cash settlement system for use between Nomura's business entities - Led the implementation of the system using Spring Boot / Apache Camel ### Cloud Architecture Consultant @ AMWAY JAPAN G.K. Jan 2015 – Jan 2015 | Tokyo, Japan -Led the migration of ecommerce applications from on-premise to AWS -Migrated web servers from WebSphere to Tomcat -Assisted technical team with Java application changes to work in a cloud environment -Set up monitoring/notifications via VictorOps (now Splunk On-Call) ### Vice President, Equity Technology @ Barclays Jan 2010 – Jan 2015 | Tokyo, Japan Responsible for the Asia cash equities risk management platform, including managing four developers and interfacing with business analysts, quality assurance, and production support staff. Coordinated internal IT training program, identified/interviewed interns and new graduates for equities technology. ### Vice President, Equity Technology @ Nomura Jan 2008 – Jan 2010 | Tokyo, Japan Responsible for the Asia cash equities analytics and risk management platforms, including managing four developers and interfacing with business analysts, quality assurance, and production support staff. Coordinated internal IT training program, identified/interviewed interns and new graduates for equities technology. ### Vice President, Equity Technology @ Lehman Brothers Jan 2001 – Jan 2008 | Tokyo, Japan Responsible for the Asia cash equities analytics and risk management platforms, including managing four developers and interfacing with business analysts, quality assurance, and production support staff. Also wrote a trading application in C# used by proprietary and program trading desks. ### Team Lead @ iXL Jan 1998 – Jan 2000 | San Francisco, California, United States -Developed full-stack web solutions for clients including Virgin Atlantic, Disney, Mayo Clinic -Managed four developers ### Online Technical Manager @ Sega of America, Inc. Jan 1996 – Jan 1998 | Redwood City, California, United States -Managed all aspects of Sega of America's web presence -Developed interactive web games / marketing materials ### Founder @ Enviro-Net Jan 1995 – Jan 1996 | Gainesville, FL -Co-founded and created Enviro-Net, a portal for environmental engineers -Sold the site to NTCC, a regional environmental engineering publisher -Served as technical advisor for the site and expanded it to be a news magazine format with publishing tools and subscriptions ## Education ### Master of Business Administration (M.B.A.) in Strategy Fox School of Business at Temple University ### M.S. in Computer Science University of Florida ## Contact & Social - LinkedIn: https://linkedin.com/in/patrick-joiner --- Source: https://flows.cv/patrickj JSON Resume: https://flows.cv/patrickj/resume.json Last updated: 2026-04-01