Python(Django,Sklearn,Pandas,Numpy,Matplotlib,PyTorch) and R programming. NLP (Python text mining, DialogFlow, Alexa , Facebook bots and IBM Watson) Apache Spark(Real time streaming,SparkML,Recommendation Engine) Hadoop / Big data tools / ETL pipelines SQL/noSQL (Mongo DB ) AWS services , elastic search , lambda architecture Node js ( beginner ) / Chat bot development / Tableau