Dear Sir,
I am a Joomla developer and working with Joomla since Joomla version1.
Please see my work history here, most of my jobs are with Joomla.
I used most of the common Joomla extensions, I know developing a Joomla template from scratch, I have a developer knows SEO very well, I understand Joomla security and optimization.
I am really interested to work for you, as it is a long term project.
Kind Regards
Mohsin