Sergio Contreras is a Principal Solutions Architect at AT&T. He possess expertise in integration, agile methodologies, unix, enterprise software, xml and 22 more skills. He is proficient in English. Colleagues describe him as "I worked with Serigo to develop a call charging system based on Cisco VOIP. This was a very complex, very technical assignment with minimal requirements/technical specifications available. Sergio was able to complete a solution within a very tight timeframe, working tirelessly, and demonstrating his strong technical capabilities. It was a pleasure working with Serigio - he is someone that can be counted on to deliver high quality solutions." and "I've had the opportunity to work with Sergio on a number of projects for the past 3+ years. The projects have ranged from very deep technical QA of mobile telephony network provisioning to writing an education course for a 1.x release software product. In all of my interactions with Sergio, he has consistently demonstrated a well thought out approach and is very mindful of the details associated with the tasks at hand. Sergio has always had the "do what ever it takes" type of attitude towards getting the job done and has never sacrificed quality to make the deadline."