In my previous roles, I have gained extensive experience in developing and maintaining web and mobile applications using a variety of technologies. On the front end, I am proficient in HTML, CSS, and JavaScript, with hands-on experience in popular frameworks such as React.js and Angular. On the back end, I have expertise in building scalable and efficient APIs using Node.js, Express, C#, PHP and other backend technologies. Additionally, I have worked with databases including MySQL, MongoDB, and PostgreSQL, and I am comfortable with both relational and NoSQL database design and management.