Software Engineer Backend

JIEYING HE *************@*****.*** 323-***-**** Scottsdale, AZ, 85260

TECHNICAL SKILLS

Languages: Java, Python, PHP, Node.js, JavaScript, Java, Scala, Oracle/NoSQL databases, Linux, SQL, MySQL Technologies: Spring MVC, MongoDB, Bootstrap, Angular, Spring3.0/2.x, Hibernate, Express.js, JSON, AJAX, DOM, Servlets, JSP 1.2, JDBC 2.0, WSDL, Rest, SOAP, jQuery, GCP, Volley, Picasso, Glide, Hadoop, Spark, Apache, Map-Reduce, Solr, Jenkins, Maven, GitHub, Selenium, WebDriver, TestNG, Flink, Kafka, Splunk, Hive WORK EXPERIENCE

Walmart, Inc. Dec. 2024 – Present

Senior Software Engineer San Jose, CA

• Contributed as a Backend Engineer in the Payments & Financial Services team, focusing on enhancing the chargeback recovery process using Kotlin and Java within a Spring Boot framework.

• Designed and implemented robust data validation mechanisms for DCA returns, leveraging Docker and Kubernetes for containerized deployments on the Walmart Cloud Native Platform (WCNP), ensuring scalable and reliable performance across distributed systems in Azure.

• Enhanced the user interface by streamlining chargeback details presentation, relocating them from the transactions tab to a dedicated payment info tab, with backend services integrated into CI/CD pipelines for efficient release cycles.

• Optimized system observability and operational insight through Splunk and OpenObserve, ensuring traceability and monitoring of workflows, while Apache Cassandra supported high-volume, fault-tolerant data storage and retrieval.

• Delivered significant operational efficiencies, saving 10 hours per week, enabling $1.5–2M in annual reversal credits, and reducing net chargeback losses by $20M while improving dispute win rates from 30% to 75%. Nbest Information Technology Co.,Ltd. April. 2023 – Nov, 2024 Backend Engineer Remote

• Worked as a backend engineer on multiple e-commerce and shopping website projects for international clients, with a focus on developing robust, scalable, and secure backend systems.

• Designed and developed RESTful APIs and microservices using Java and Spring Boot to handle core functionalities such as user authentication, product catalog management, shopping cart operations, and order processing.

• Implemented database schemas and optimized queries in MySQL for handling large datasets related to products, orders, and user data, improving query performance and reducing load times.

• Successfully launched multiple e-commerce platforms with seamless integration of third-party payment gateways, logistics, and inventory management systems.

• Contributed to a significant reduction in cloud infrastructure costs by optimizing resource allocation on Alibaba Cloud, to deploy and manage application infrastructure, ensuring high availability and scalability. eBay, Inc. Jun. 2022 – Jan. 2023

Software Engineer, Security San Jose, CA

• Involved in Global Information Security – SADE (Security Analytics and Data Engineering) team, responsible for the design, development and implementation and ongoing support of the cyber security analytics and data engineering program within the Information Security Team.

• Worked with our customer to build out workflows and Hadoop jobs based on their requirements.

• Designed, developed and maintained data storage, processing and reporting capabilities in Flink and Kafka from Splunk or different APIs, created batch jobs to provide unified search experience by using Spark and Hive.

• Owned RBF(Router based federation) Hadoop Sink Migration based on mimic Splunk SIEM functionality, aimed at tracking log loss and Governance Risk Management Compliance reports in Splunk without data ingestion.

• Cut cost of Splunk by avoiding data ingestion in Splunk 7TB/day, 25TB/day data filtered out approximately. eBay, Inc. April. 2021 – April. 2022

Software Engineer San Jose, CA

• Worked in the Identity-Platform-Device-Id team, contributing to the development and integration of various APIs to enhance system functionality and interoperability. Utilized technologies such as Java, Spring Boot, and RESTful web services to build and manage APIs.

• Coordinated with development teams to craft comprehensive Test Plans and Test Cases, drawing from Business Requirement and System Specification documents, ensuring all edge cases were covered.

• Designed and developed Java-based components and services, ensuring seamless integration with multiple APIs using tools like Postman for API testing and Swagger for API documentation.

• Built CI/CD pipelines using Jenkins, configured Docker for containerization, and utilized Kubernetes for orchestrating deployment. Monitored system performance with tools like Grafana and Prometheus, ensuring reliable communication between different system components.

• Implemented OAuth 2.0 and JWT for secure API authentication and authorization, enhancing the security of the Identity-Platform-Device-Id systems.

Shoputopia, Inc. July. 2020 – April. 2021

Software Engineer Ontario, CA

• Created a comprehensive e-commerce site for pet accessories, incorporating modules for user authentication, shopping, blogging, product details, bulk orders, and customization.

• Developed interactive web applications using Java, JavaScript, HTML5, CSS3, and SQL Server, and utilized React to build a responsive front-end user experience.

• Conducted system analysis and design with OOD/OOP, integrating business logic with Java J2EE Spring, JSON, XML, Oracle, and Unix for streamlined operations.

• Implemented Spring MVC, Hibernate, and RESTful services for efficient information exchange and backend development, including SQL and PL/SQL database management. EDUCATION

University of Southern California - Los Angeles, CA Aug. 2018 – May. 2020

• Master of Science in Computer Science GPA:3.5/4.0

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