For data science I use Python (and his libraries for it: MatPlotLib, Numpy, Pandas and Scikit-Learn). I have some experience on SQL. Sometimes I use Apache Spark for data processing and machine learning, and other times Keras and TensorFlow.
I am learning about statistics and natural language processing.
In the future I have to learn about AWS and Google Cloud Platform.
projects and hacks
Currently I'm creating a portfolio and writing articles about data science and machine learning algorithms.