Expert knowledge of python for deploying analytics solution in production/development environment is mandatory.
Candidate should have understanding of bringing operational efficiency through automation, code optimization, parallelization, RDD etc.
Some exposure to different science module like pandas, sckit learn, numpy, scipy etc. is preferred.
Should have strong understanding of linux system and its symbiotic relationship with python.
Some exposure to any of the Big Data technologies like spark, pig, hive, map reduce is preferable