Sachin Kumar has over 4 years of experience as a software developer at TCS working on projects for clients like Walgreens. He has expertise in technologies like Java, J2EE, Spring, PHP, and frameworks like Struts and Bounce. Some of his responsibilities include developing and maintaining application components, training new team members, and acting as the client point of contact. He has experience leading teams and delivering projects like an IVR application and a customer preferences management program.