Expert WordPress Developer

We are looking for a web developer with really excellent WordPress experience (expert level) to help us with the development of custom themes and plugins.

Our plans are to launch a managed cloud-based platform for performance optimized and secure WordPress hosting.

Your tasks would be:
- develop and maintain custom themes
- develop child themes based on Layers and Upfront
- develop and maintain a page builder plugin
- develop and optimize various custom plugins
- optimize overall performance (page speed optimizations)
- setting up and maintaining nginx web server
- setting up and maintaining caching proxies like Varnish and nginx
- setting up and maintaining object caches like redis or memcached
- setting up and maintaining ElasticSearch

Deep PHP 7 and especially WordPress development knowledge is required, also at least some experience on performance optimization, as well as being comfortable with Linux based hosting platforms.

Please provide detailed information about your past experience and projects along with your application.