We were in charge of getting metadata from different internal & external sources, processing it, and deliverying it (some in real time, some offline) to the proper front end & intermediate servers.

Implemented detection of signals to detect bad quality Ads (blank, malware, etc). Also implemented features for our clients (mainly deeplink, which generated a new income for this quickly ongrowing market).

Implemented different features (like rank), worked on some efficiency algorithms, and also implemented a complete development environment to allow proper deployment, caching hard to find bugs, etc. 

The systems were very multithreaded, so got the opportunity to play a lot with concurrency problems, and learn about proper practices.

Working on an ecommerce platform, mainly backend (rails, node), but also some front end (React).