A very simple way to describe it would be a private Gumtree (Website / App depending on price)
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Hey, I’m a Web Designer & Developer Currently working from Oxford, UK. Your project looks interesting to me and I’ve got the skills required. I've done something similar recently, will be happy to share.
I am a full time developer and have high skills in website and mobile app design & develop so I can complete this project. My price and time is negotiable. Let's discuss details via chat. I'll provide best service.
Hello, how are you? My name is Mike, I’m a Web Designer & Developer based in Boston, USA. I feel that my skills match your requirements perfectly. I recently did a very similar project which I can share with you.