# HTML/CSS/LESS/SASS - Expert, comfortable with setting up LESS/SASS including 3rd party frameworks. # JavaScript/AJAX - Able to write and debug more advanced JS and AJAX, ideally comfortable with Angular.js and other JS libraries included in WordPress core. # PHP - Expert: Able to debug PHP, comfortable with actions, hooks, filters, variables and a wide range of codex functions. # SQL - Advanced MySQL admin and use, including advanced $wpdb and extending native WordPress functionality. # Git - Git strategy and integrations. # Strong knowledge in XML, JSON and 3rd party APIs. # Cross-platform and cross-browser : Fully understands progressive enhancement, able to predict features or designs. # Server configuration : Advanced server debugging, advanced stack understanding. # Responsive : Flawless responsive markup implementation.