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We are a startup project in the field of Natural Language Processing and AI. The current work involves sentiment analysis and ranking of tweets and authors. Much of the analysis is described in an academic paper - Tweet Recommendation with Graph co-Ranking (Yan).
This role requires good skills in linear algebra, processing vectors, understanding training, sentiment analysis algorithms, and text processing (eg Gate, coreNLP).
Knowledge of Java is important, but a theoretical role is possible supported by a developer. If you are a developer, then knowledge and skills in Hadoop, HDFS, HBASE, Java would be an advantage as would skills in Mahout, and NLP processors such as coreNLP. A knowledge of twitter data would be an advantage.
Your role will be to work from specs to provide solutions in NLP so text can be process to establish sentiment and also ranking.