CSS, JavaScript, React JS, Node JS, MongoDB
As an experienced mobile and web developer, I believe my skills would be a great fit for your Business Billing Website Development. I've worked on projects involving e-commerce, making me well-versed in all the technical aspects you've mentioned. Specifically, I am proficient in using HTML, CSS, JavaScript and have substantial experience with React JS and Node JS –the technologies you prefer for your project. Over the last four years, I have developed numerous mobile apps as well as web applications for different industries including travel apps, food ordering apps to name a few.
Moreover, I have hands-on experience in integrating secure payment gateways like Credit Cards and Direct Bank Transfers seamlessly into websites. My understanding of these processes can undoubtedly help to create a Billing Website that not only looks professionally stunning but functions without any glitches.
Lastly, managing user accounts is an area I have deep expertise in. Having handled massive user loads before,your estimate of 100-500 user accounts is comfortably within my capabilities. My clients' satisfaction is paramount to me — so be assured that I will provide the absolute best value for your business by developing a powerful billing website for you. "You think it. We build It!"