I'm a Full Stack Cloud Engineer @ IBM India Pvt. Ltd.
I've had my hands dirty with ReactJS, NodeJS, VanillaJS, Python, Java, Go, Firebase, Bootstrap, SemanticUI, HTML5, CSS3, Docker, Kubernetes, AWS, IBM Cloud, Heroku.
Apart from building an billing app, I can also help you in deploying it for very nominal charge to make it more reliable and fast.
We can have a discussion about the same.
Looking forward to work with you.