Where's the portfolio? Someone is supposed to take their word on some text and a picture. What issues do you have with dev shops? How does this solve those iss

Where's the portfolio? Someone is supposed to take their word on some text and a picture. What issues do you have with dev shops? How does this solve those issues? How do you even know if this solves the issues, there is literally no information? What tech stack do they work with? If I have my own engineers how do I know what you are going to offload to them?