As a Core Java Developer at Cognizant, I utilized my expertise in Core Java, SQL, Spring Boot, Spring Framework, HTML, CSS, and Postman to design, develop, and implement efficient RESTful web services and interactive web pages. I was responsible for developing robust server-side logic and ensuring optimal performance and responsiveness to front-end requests. My role involved integrating front-end elements with back-end services, performing complex SQL queries to optimize database performance, and maintaining data integrity. By leveraging my full-stack development skills and attention to detail, I successfully delivered high-performing, reliable, and user-friendly software products that met the needs of our customers.