Hello,
I work in Hadoop/Bigdata technologies for several years.
I worked in Spark, Kafka, Cassanrda, Streaming, Mongo, ELK Stack (ElasticSearch Logstash and Kibana).
I implemented in Java/Scala and Python (like Pysparkm Pykafka) etc.
However for independent development purposes I have my rate $25/h but if it is a dedicated hour devotion the rate will increase.
Please let me know if you are interested.
Thanks!