Hello!
I am Denn - all-round web developer from Ukraine.
Crafting various web stuff for 5 years, using modern technologies, framework and tools.
Most work is done using php, js/jQuery, Angular, html5/css3, MySQL.
I am single person, not agency.
But I can write that API for you.
Have experience in building REST API, for advertising system of video channel.
Also, have contacts of sysadmins&devs(my former colleagues) who proffessionaly can deliver host & video conversion or develop scripts.
Best wishes, Denn