Sandra Abdel Khalek

Helped build a Card Management System (CMS) using Java, Spring Boot, and JPA Hibernate Mapping. Designed user interfaces using Vaadin 8+ to make the system easier to use. Tested and debugged code to make the application stable and secure. Worked closely with team members to solve problems and improve performance

Developed web applications using React JS for the frontend and Java (Spring Boot) for backend services. Acquired proficiency in React JS within less than a month, gaining the ability to manage and implement complex features in an already-built project, significantly improving feature delivery time. Transformed UI designs into fully functional, responsive components for better user experiences. Reduced technical debt by 20% and optimized queries and functions, leading to a 50% improvement in app performance and increasing code coverage to 5%, driving better code quality. Developed RESTful APIs to connect frontend and backend systems. Enhanced application performance by optimizing 5+ complex SQL queries in PostgreSQL & BigQuery, leading to a 15% reduction in average query response time and improved user experience. Used Git to manage code changes and support teamwork. Increased code coverage by 5% through unit tests, reducing production bugs by 10% and ensuring consistent feature reliability. Introduced PR workflows that reduced merge conflicts and improved code quality by 50%, facilitating better collaboration across the development team.