Software Engineer Engineering

Lijuan Liu

Software Engineer

*************@*****.*** • +1-929-***-**** • linkedin.com/in/lijuanlijuan Education

Stevens Institute of Technology, NJ Master of Software Engineering Jan 2023 - Dec 2024 Hofstra University, NY Master of Business Analytics Jan. 2021 - Dec 2022 Skills

Programming Languages: Java (Core Java, J2EE, Multithreading, Concurrency, Spring Boot, Hibernate), Python

(Django, Flask (for backend development and API integrations) ), C++, JavaScript (React.js, Angular, Vue.js, Type- Script), Groovy

Performance Testing:JUnit, Mockito, TestNG, Familiar with JMeter, Blazemeter, LoadRunner, and Selenium Cloud&DevOps AWS (Lambda, ECS, S3, CloudFormation, IAM, API Gateway, CloudFront), Basic understanding of Azure, Docker, Ku- bernetes, Terraform, CI/CD (Jenkins, GitLab CI/CD, GitHub Actions) Databases: Oracle, DB2, PostgreSQL, AWS RDS, MongoDB, SQL Optimization, Performance Tuning Security& Authentication:OAuth2, JWT, RBAC for secure authentication and authorization System Design& Architec- ture:Microservices Architecture, Event-driven Systems (Kafka), Fault-tolerant Design, Scalable Systems System Mon- itoring: Familiar with Splunk, AppDynamics, Wily Introscope, MS Perfmon, AWS CloudWatch, Debugging Tools Performance Optimization:Expertise in API performance tuning, SQL query optimization, and system scalability Code Quality& Collaboration: JCode Reviews, Performance Optimization, Best Practices, Agile Development Work Experience

Radical AI May 2024 - Present

Software Engineer Intern

• Developed and maintained Java Spring Boot microservices, enhancing API performance by 40% through SQL query optimization, service design, and performance testing using JMeter and LoadRunner.

• Refactored services with AWS ECS, Lambda, API Gateway, reducing deployment time by 50% and boosting scalability

• Enhanced system security with Spring Security (OAuth2, JWT, RBAC), ensuring secure data access per best practices

• Conducted performance monitoring with Splunk and AppDynamics, resolving bottlenecks for smooth functionality

• Automated CI/CD pipelines using Jenkins and GitLab CI/CD, accelerating development and improving reliability

• Collaborated with teams to design scalable architectures, boosting availability and supporting growth Jichen Data May 2023 - January 2024

Software Engineer Intern

• Developed scalable Java Spring Boot microservices integrated with PostgreSQL, reducing API latency by 40% through optimized SQL queries and efficient service architecture.

• Migrated legacy services to AWS ECS and Lambda, enhancing system scalability and reduced 30% operational costs

• Optimized database performance using advanced SQL tuning techniques, improving query execution speed by 40%

• Ensured secure data access with Spring Security (OAuth2, JWT, RBAC), aligning with compliance standards

• Enhanced system performance using AWS CloudFront and API Gateway, improving delivery speed and response time

• Automated CI/CD pipelines with GitHub Actions and Docker, ensuring fast, reliable production releases Projects

MUI-Viz Portfolio — Financial Data Analytics Dashboard Spring 2023

• Built an interactive financial dashboard using Angular, Vue.js, and TypeScript, ensuring real-time data visualization

• Developed RESTful APIs with Java Spring Boot, integrating with AWS API Gateway and Lambda, resulting in 40% reduction in data latency

• Leveraged AWS Lambda for serverless order management, optimizing costs while ensuring scalability and throughput

• Designed comprehensive test cases using JUnit and TestNG, ensuring robust edge case handling and improving reliability Job Hub Web Application — Java-based Multi-role Job Management Platform Link Spring 2023

• Developed a job tracking system with Java Spring Boot, DB2, and PostgreSQL, ensuring availability and performance

• Secured authentication with Spring Security (OAuth2, JWT, RBAC), enabling role-based access control

• Enhanced system responsiveness by 35% using Kafka and AWS Lambda for event-driven architecture.

• Built responsive frontend components using Angular and React.js, ensuring seamless integration with backend services QuickEats — DoorDash-like web application Jan -Apr 2023

• Built a scalable platform for real-time food delivery and payment processing with Java Spring Boot and AWS Lambda

• Enabled real-time communication via WebSockets, improving order tracking by 30%

• Integrated secure payment gateways and optimized API calls for faster transactions, ensuring smooth user experience

• Ensured backend scalability with AWS Lambda, reducing infrastructure costs while maintaining performance

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