Renkun Liu

Senior Software Engineer – SAP ERP Modernization Project at Hydsoft Technology

Orchestrated migration of legacy SAP ERP to cloud-native microservices using Spring Boot, Temporal, Kafka, Redis, SAP HANA, Node.js/TypeScript, and Angular; boosted scalability and real-time integration by 30%. Integrated SAP Fiori with Angular/React frontends, improving UX and performance by 25%. Led cross-time-zone Agile collaboration with teams in India, Vietnam, US, and Germany, achieving 100% requirement fulfillment under deadlines. Conducted code reviews and automated JUnit/Selenium tests, ensuring high-quality, maintainable code.

Lead Java Developer – Internet Brands SSO Project at Hydsoft Technology

Engineered secure SSO system with Spring Boot, Kafka, Keycloak, and TypeScript/React, integrating MongoDB, Redis, PostgreSQL, and CockroachDB—delivered 99.9% uptime for global users. Developed WebSocket service using Node.js, TypeScript, React, and Webpack for real-time customer communication, leveraging Webpacks module bundling to optimize front-end performance. Utilized Webpack to streamline JavaScript and TypeScript module bundling, reducing bundle size by 15% and improving application load times. Coordinated Scrum sprints for distributed teams (US, Mexico, India), reducing risks by 20% via PoCs and Dynatrace/Prometheus/Grafana monitoring.

Senior Software Engineer – SAP ERP Maintenance at Hydsoft Technology

Optimized SAP ERP for B2B clients using Java/Spring Cloud and SAP HANA, maintaining 100% reliability. Mentored junior developers, increasing team productivity by 15% through technical workshops. Built RESTful APIs and Kafka integrations, resolving issues in collaboration with US/India teams.

Software Engineer at uCloudLink

Designed microservices with Java/Spring Boot, Spring Cloud, Kafka, Redis, MongoDB, and MySQL—cut response times by 30%. Optimized Kafka partitioning, enhancing throughput by 25%. Deployed applications on AWS EC2 with Jenkins CI/CD pipelines.

Junior Software Engineer at iSoftStone

Developed network management system using Java/Spring MVC and Oracle, with Angular integration—improved operational efficiency by 15%. Created responsive UIs with HTML/CSS/JavaScript, boosting usability by 20%. Implemented Selenium UI tests, reducing manual testing efforts by 10%.

Senior Software Engineer – SAP ERP Modernization Project at Hydsoft Technology

Orchestrated migration of legacy SAP ERP to cloud-native microservices using Spring Boot, Temporal, Kafka, Redis, SAP HANA, Node.js/TypeScript, and Angular, boosting scalability and real-time integration by 30%. Integrated SAP Fiori with Angular/React frontends to improve UX and performance by 25%. Led cross-time-zone Agile collaboration with teams in India, Vietnam, US, and Germany, achieving 100% requirement fulfillment under deadlines. Conducted code reviews and automated JUnit/Selenium tests to ensure high-quality, maintainable code.

Lead Java Developer – Internet Brands SSO Project at Hydsoft Technology

Engineered secure SSO system with Spring Boot, Kafka, Keycloak, and TypeScript/React, integrating MongoDB, Redis, PostgreSQL, and CockroachDB—delivered 99.9% uptime for global users. Developed WebSocket service for real-time customer communication using Node.js/TypeScript/React with Webpack optimizations. Coordinated Scrum sprints for distributed teams (US, Mexico, India) with PoCs and monitoring via Dynatrace/Prometheus/Grafana, reducing risks by 20%.

Senior Software Engineer – SAP ERP Maintenance at Hydsoft Technology

Optimized SAP ERP for B2B clients using Java/Spring Cloud and SAP HANA, maintaining 100% reliability. Mentored junior developers via technical workshops, increasing team productivity by 15%. Built RESTful APIs and Kafka integrations, collaborating with US/India teams to resolve issues.

Software Engineer at uCloudLink

Designed microservices with Java/Spring Boot, Spring Cloud, Kafka, Redis, MongoDB, and MySQL—reducing response times by 30%. Optimized Kafka partitioning to boost throughput by 25%. Deployed applications on AWS EC2 with Jenkins CI/CD pipelines.