We are a new member of Freelancer and a team of start-up [login to view URL], you can take a view at my website [login to view URL] In our IOT platform, we use NODEJS for back-end , ANGULARJS for front-end, so we are confident to meet your requirements.
We 've been working in NODEJS 2 years, take over many architectures , so we will have the best architecture for you.
Hope to have chance work with you.