Zeyu Ni

Architected and developed ClickToPay, a global digital payment platform serving 40M+ users, leveraging Java, Spring Boot, Oracle DB, Kubernetes, Jenkins, and Docker to ensure seamless backend performance, scalability, and system reliability. Demonstrated strong problem-solving, communication, and cross-functional collaboration skills throughout the platform’s lifecycle—from design and implementation to testing, deployment, and production support. - Drove the end-to-end architecture and development of a high-performance orchestrator component for the ClickToPay platform over a 2-year project, reducing latency from several seconds to milliseconds and boosting overall system performance by 50%. - Led a team of 3 engineers, holding them accountable while providing technical support to successfully deliver 10+ checkout features unblocking $1B+ transaction flow annually. - Refactored legacy monoliths (Notification, Identity, Simulator) into modular microservices, enabling reuse across 5+ systems and supporting 50+ downstream services, cutting debugging time by 40% and accelerating feature rollout by 30%. - Leveraged Generative AI tools like GitHub Copilot to optimize development workflows, delivering a 40% increase in overall productivity. - Proven ability to troubleshoot and resolve critical system issues in global-scale applications, reducing resolution time by 50% through efficient analysis and collaboration. - Secured sensitive cardholder data using JWT, HTTPS, and Visa Token Service, contributing to the issuance of over 1B tokens and ensuring PCI-DSS compliance. - Spearheaded REST API development for digital wallet services, ensuring seamless QA testing and global team collaboration. - Transitioned into a full-stack role and integrated Google Analytics, enabling key performance and security tracking for frontend APIs. - Mentored junior engineers and streamlined onboarding processes, reducing new developer ramp-up time from over 50 days to less than 7 days.

Designed and implemented web-based solutions for educational platforms, managing courses and student enrollments at scale. Collaborated with cross-functional teams to deliver robust applications within Agile workflows. - Established web applications for an international educational platform managing 50+ courses and 2,000+ student enrollments. - Delivered CRUD APIs and frontend interfaces using Polymer, Node.js, and PostgreSQL for training center management. - Created a web application to obtain operator information from IP addresses for network analysis. - Worked in an agile fashion process, including daily scrum, sprint planning, user stories, task breakdown, sprint reviews and retrospective meetings.

Contributed to the development of web applications for internal engineering use, improving processes for centrifugal pump design and analysis. - Developed REST single-page web application to support mechanical engineers for designing centrifugal pump and it was successfully used in the 50+ employees company with high reliability. - Implemented the View layer using AngularJS and Bootstrap, the Controller layer by Java&Spring Boot, and the persistent layer using Spring Data with MySQL. - Implemented data visualization to help users better understand the design choices by Highcharts. - Designed and executed unit and integration tests using Spring Test. - Utilized Docker to containerize infrastructure and Maven to manage dependencies.

Algorithm Research on Wireless Sensor Networks • Published 5 academic papers in Wireless Sensor Networks indexed by EI. • Developed Time Synchronization Algorithm in Wireless Sensor Networks based on time-average strategy and Maximum Likelihood Estimators, which can save about 60% energy consumption. • Designed energy-efficient routing algorithm of Wireless Sensor Networks based on ant-colony optimization.