As a seasoned Full Stack Web Developer experienced in both front-end and back-end development, I possess the extensive skill set required to tackle your unique project demands. My fluency in CSS, HTML and JavaScript makes me perfectly suited to delivering a high-quality, dynamic and most importantly efficient solution that is devoid of any "copy-paste" or garbage code.
Drawing on my 5 years of professional experience, I can confidently build a responsive pop-up box that plays YouTube videos upon clicking a button - all while storing the video sources in a customized array, without overloading your webpage even the slightest degree.
Plus, my broader proficiencies with PHP, Laravel, WordPress among other languages can lend themselves brilliantly to this project's potential future needs. Overall, I promise you full-time dedication, 24/7 accessibility and consistent customer support long after project completion. Allow me to demonstrate my commitment to excellence!