I have worked at Paperblog, a magazine-like blog aggregator. One of my jobs was to add recommendation functionality, which involved front-end work, database scaling, and asynchronous back-end precomputations that did the heavy lifting without compromising user responsiveness.

I have also worked for an advertising agency, rewriting a management interface and doing deep integration with its adserver, enabling the quick addition of functionality (such as fine-tuned targeting) that spanned both front-end and back-end.