Hi,
I have been working as Magento Developer from last 8 years.
I am true expert in Magento Extensions Development/Customization and already developed/modify dozens of magento extensions and can handle any task/issue related to it. Now coming to the job, I just checked your job description very carefully, I can help you to add "SKU" text filter on magento admin as per your requirements.
Can you please let me know once you are here? So we can discuss further in details.
Regards