PageSpeed: time reduction web speed

PageSpeed of my site shows a very slow site. There are some areas to work on: - Leverage browser caching - Reduce server response time - Eliminate render-blocking JavaScript and CSS in above-the-fold content I don't like bad jobs. There are coders that use bad solutions and, after some time, these produces bad consequences. So this is an offer opens only to those that like to make good jobs, good code and satisfied customers and not jobs only to take money. I will pay only for jobs in which those parameters (they are very clear and I will furnish access to my Google PageSpeed before starting) will reduce their critical alarm from red to a green status. I will not pay anything to those that will find some excuses and that will not obtain these results. I need only persons able to do this job (with experience in this field) and not those that is the first time they see these arguments. Regards