Front end Angular backend YII2

We are looking for an expert who can work through our system and make sure the system works well . We have a working system on one domain, we shifted it on another, and there are issues like, the apis are all set for old domain, not the new, so we need someone who can fix all the APIS etc, the code on both server are in executable form and we do have the source code, but that is old code, old in a sense it was done 6 years ago, so if you need to replace apis etc, then we need to run that code and may be it will need upgrade of the code or like that.

i need an expert who can start and deliver, i have been let down by a person that wasted 3 days of ours, so need an expert with proven past expertise in that . Should start right away and finish it in a day or so, nothing custom or hard for an expert.start the bid with the word i will start now and will deliver it in a day .