Magento expert for quick fixes needed

General information for the website: We sell online Flooring and Tiles
Kind of development: Customization of existing website
Description of requirements/features: We need a Magento Professional to help us upgrading some modules already purchased, keeping the core files intact, or do some custom development.

Some example of work involved, would be around these areas:
- custom work on some existing modules, in case we can't get help from the technical support who built that module,
- different sql errors which appears on the go, and need quick fix.
- optimise the search engine of Magento
- optimise the loading speed

Please don't buy extensions on your account and charge us 'for your time of development', as no payment will be made for this type of work.
We are looking for a professional to whom we can rely on getting the job done, fair and square, in the same way he/she will rely on payment made in time,
from our side.

If you think this work will be something comfortable for you to do, we would like to hearing form you.
Payment methods: Credit Card
Specific technologies required: Magento, MySql, HTML5, AJAX
Extra notes: