Hello,
I can add extra text field on your checkout page on Magento as per your given brief on project post. Let me know when you available to discuss more in detailed.
Regards
Rina
++++++++++++++++++++++Certified Magento Developer++++++++++++++++++++++++
Hi, With 8 years of hand on experience with magento i am ensuring you flawless magento customization like adding custom field in checkout.
Very very interested and i can start whenever you want.
Regards
Sabbir H