Hi,
I have been working with React and Angular since last 3 years.
You can contact me to see some of my works and make a decision afterwards.
Responsiveness is the thing on which I have worked a lot , some of my work support upto minimum of 320 px of width which is the IPod resolution.
Also in case you are not happy with the designs, we can have upto 3 revisions.
We can have a small discussion to get into the technical details.
Looking forward to work with you.