Hi,
Your project are perfect match with my skills and experiences.
I'm fancy at javascript frameworks like node.js, react.js, angular.js, etc.
I have ever worked on node.js serial port npm module and it was a bit compliacted, anyway I did it.
Being a highly experienced web developer, I can assure that we are on the same page from the word go as I have worked on projects similar to yours in the past. And, therefore I can easily accomplish your desired goals, within time and within your budget as well.
Let me know your idea in details.
Regards,
ChunYan.Y.