Over that 10 years of experience with LAMP stack. One of my beloved areas of expertise is tuning web applications performance, e.g. tweaking cache: HTTP level cache, runtime, shared cache (Memcached, Redis, files), etc., but the most common task in a process of enhancing application performance is tuning database queries, so I can optimize your heavy SQL's to fly like 5th generation fire-fighter. Hire me and you will get yourself a swiss knife for your project.