Also I incorporate SEO friendly features right at the time of design inception to cut down on redundancy in terms of time and money.
I check my sites for cross browser compatibility on a browser matrix of IE7+, FF3+, Google Chrome,Safari and Opera .
These are my Core Skills :
HTML, XML, and CSS,
Drupal, Magento, Wordpress, Shopify, Open Cart
Stripe, Paypal , Athorize.net, USA Payee, Chosen Payment gatway API implement.
Facebook, GoogleMap, Google Direction, linkedin, Twitter API and Youtube,
ZOHO CRM api integration