Need support & enhancement for my PHP website on yii 2 framework

We have websites and android app need someone experienced to support that for long run and enhance the features Looking for some who can work 20 hours a week and be on my payroll. Job description: Experience: 5 - 7 years Skills: Php developer, PHP programmer, PHP MYSQL AJAX, YII2.0 framework Strong experience in designing and developing complex applications using Core PHP and PHP Frameworks. Demonstrate exceptional problem solving skills and analytical abilities. Strong on OOPS and must have worked in depth with PHP 4 and 5. Should have used at least one PHP MVC framework like yii ,yii 2.0 Yii /yii2.0 Framework experience preferable. Understanding the fully synchronous behavior of PHP Understanding of MVC design patterns Basic understanding of front-end technologies, such as JavaScript, HTML5, and CSS3 Knowledge of object oriented PHP programming Understanding accessibility and security compliance Strong knowledge of the common PHP or web server exploits and their solutions Understanding fundamental design principles behind a scalable application User authentication and authorization between multiple systems, servers, and environments Integration of multiple data sources and databases into one system Familiarity with limitations of PHP as a platform and its workarounds Creating database schemas that represent and support business processes Familiarity with SQL/MYSQL databases and their declarative query languages Proficient understanding of code versioning tools, such as Git and delivering responsive web interfaces.