Wordpress custom work for theme and plugins developments

I require expert WordPress development services to customize an existing theme and build custom plugins for a new website. The ideal freelancer will have extensive experience customizing themes and building complex plugins from scratch.

The theme customization requires modifications to the header, footer, and sidebar templates to accommodate new design elements. Styles will need updated to match the client's branding. Custom meta boxes and shortcodes must be integrated for additional functionality.

For plugins, creation of an appointments calendar with booking forms is needed. Users should be able to browse available time slots and book directly on the site. Administrative interfaces for managing appointments are also required. A knowledge base plugin for storing and categorizing support articles must also be developed.

Other duties involve integrating third party APIs, building custom post types, customizing the admin panel, and ensuring compatibility with latest WordPress versions. SEO best practices and performance optimization will be an important focus. Unit testing and documentation of code is expected.

The freelancer should be adept with PHP, JavaScript, CSS, HTML, MySQL and have expertise developing with WordPress standards and practices. Excellent communication and strong work ethic are essential as this project has a 4 week timeline. Only bids from highly skilled and experienced WordPress developers will be considered.