Alexa1 year experience
Built the biggest and most complicated Alexa app( http://www.imedicalapps.com/2017/02/healthtap-dr-ai-amazon-alexa/ ) featured by Amazon , entirely in Ruby on Rails ....
Ruby on Rails3 years experience
Be it rails 2 with ruby 1.8.x , rails 3 with ruby 1.9.x or rails 4 with ruby 2.0 Used them all :)
Elasticsearch3 years experience
recently moved entire infrastructure form Solr To ElasticSearch. It was a tiring but a very good learning experience.