Key responsibilities:

1. Writing clean and efficient code using PHP language and Codeigniter framework
2. Developing back-end components to improve responsiveness and overall performance
3. Integrating back-end components with the front-end aspects of the application
4. Developing and managing well-functioning databases and applications for websites and web applications
5. Testing and fixing bugs before deployment
6. Managing web hosting and server management

Required:

1. Should be well-versed in PHP, MySQL, and Codeigniter
2. Should be good with programming basic and have a logical mind
3. Ideally a full-stack developer

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