Transfer a WordPress site & optimize loading time

We are searching an WordPress expert available immeditaly for the following mission :

1. Transfer a website from a server to another and make sure everything is in place and working correctly
2. Optimise the loading time of the site (not just using plugins that we already know ... but a deep optimization)

Required :
- Solid experience in transfering WordPress site
- Solid references
- Available now

Budget : 400€ maximum