# Zhirui J. > Software Engineer at Walmart | Java, Spring, Azure, AWS, GCP Location: Greater Boston, United States Profile: https://flows.cv/zhirui ## Work Experience ### Software Engineer @ Walmart Global Tech Jan 2024 – Present ● Spearheaded development of Next Gen Omni, Walmart’s next-generation financial platform supporting 30M+ daily store-to-store transactions across Sam’s Club and Walmart locations, leveraging Spring Framework, Kafka, Lenses.io, Cosmos DB, Jenkins, Kubernetes, and DB2. ● Designed and implemented real-time data processors for international store financial systems, enabling daily filtering of 1.2M transactions from Mexico and Canada by using Spring Boot, Spring MVC, Kafka, and JDBC. ● Modernized 20+ apps by upgrading from JDK 11 to 21, improving transaction processing performance by 57%. ● Collaborated with Walmart’s infrastructure team to optimize Maven dependency management across 20+ applications by introducing the internal GTP BOM, reducing development cycle time by 40%. ● Accelerated CI/CD efficiency by 90% through implementation of parallelized functional tests across 3 mission-critical application cycles by using JUnit5 and Mockito. ● Optimized performance test analytics time spending by 60% in 8 business services through implementation of automated AI log analysis service integration with LLM Model APIs using Python, Jmeter, and Automaton. ● Led cloud-native migration of log management infrastructure from Splunk to OpenObserve for 15 microservices. ### Software Engineer @ RockBook LLC Jan 2023 – Jan 2024 | Remote ● Designed and implemented a backend and infrastructure service for RockBook, a start-up social media and information platform able to handle over 2,000,000+ daily active users, using A WS SAM. ● Developed and maintained a backend dependency consisting of 100+ reusable components using Maven on Github, including database fields, exception handlers, HTTP connection methods, and database connection modules. ● Collaborated with the founder to design and to implement 20+ A WS Lambda functions, 15 API Gateway endpoints, and an RDS (MySQL) with 10+ tables for features including content management, comments, user profiles, likes, and file storage, be able to serve 5,000,000+ API requests daily. ● Designed and implemented notification systems using SNS, SQS, SES , ensuring real-time processing and delivery of over 10,000,000+ mobile, SMS, and email notifications daily. ● Integrated S3 and CloudFront for storing and serving 100TB+ of user-generated content, CloudWatch for monitoring and logging 100+ metrics and 500+ log events per second, IAM for enforcing access control policies across 10+ roles and 50+ permissions, and VPC for securing network communication between 5+ services. ● Implemented and maintained 5 CI/CD pipelines using A WS CodePipeline and CodeBuild, automating the build, testing, and deployment process for 4 environments (dev, build, beta, prod), and managed database structure using Skeema.io for version control and schema migrations, handling 20+ schema changes per month. ### Software Engineer @ BeaconFire Solution Inc. Jan 2022 – Jan 2023 | Princeton, New Jersey, United States ### Software Engineer Intern @ Even Financial Jan 2022 – Jan 2022 | New York City Metropolitan Area ● Developed the next generation front-end A/B testing control center for Fiona, a financial searching service website, reaching out over 56,000+ users utilizing TypeScript, React.js, GCP, and GrowthBook’s Library. ● Analyzed and built A/B testing metrics in the control center, including click-through rate (CTR), session duration, bounce rate, page views per session, and conversion rate for Fiona’s credit card, student loan, and insurance sessions. ● Implemented feature flags for enabling user-customizable theme selection and data display options. ● Deployed metrics' alarms in GCP BigQuery, including error rate alarm, traffic anomaly alarm, and abnormal bounce rate alarm, to monitor real-time experiments' feedback from control center. ### Software Engineer Intern @ Guangzhou Sport University Jan 2020 – Jan 2020 | Guangzhou, Guangdong, China ● Developed a data analysis control center for 5,000+ users using Spring Framework, AWS, and Pandas in a team of 8. ● Developed student-side control center interfaces, facilitating multivariate analysis and data visualization. ● Established database to store and handle questionnaire data, user responses, and test indexes, coupled with crafting APIs for distributing questionnaires, processing submissions, and extracting results. ● Implemented batch processing using Spring Batch for handling analysis submissions by grouping datasets, and integrated Spring Cache for caching accessed data, including analysis results and user response patterns. ### GuangFa Securities, Guangzhou, Guangdong, China @ GF Securities Jan 2018 – Jan 2018 | Guangzhou, Guangdong, China • Filtered and rearranged portfolio data with Excel and R Studio to optimize investors’ portfolios. • Built up CAPM and FF3F model in R Studio to evaluate hedging probably of portfolio. • Created linear regression model in R Studio to forecast three different period returns and risk (5 years, 10 years, and 15 years) of portfolio. • Translated official documents for GuangFa Securities. ## Education ### Master of Science - MS in Computer Science Boston University ### Bachelor of Arts - BA in Mathematics and Economics Rutgers University ## Contact & Social - LinkedIn: https://linkedin.com/in/zrj98 --- Source: https://flows.cv/zhirui JSON Resume: https://flows.cv/zhirui/resume.json Last updated: 2026-03-28