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https://en.wikipedia.org/wiki/Reddit#Technology
Reddit was originally written in Common Lisp but was rewritten in Python in December 2005.[42] The reasons given for the switch were wider access to code libraries and greater development flexibility. The Python web framework that former Reddit employee A
aron Swartz developed to run the site, web.py, is now available as an open-source project.[43]
Reddit currently uses Pylons as its web framework.[44] As of November 2009[update], Reddit has decommissioned their physical servers and migrated to Amazon Web Services.[45]
Reddit uses PostgreSQL as primary datastore and slowly moving to Apache Cassandra, a column oriented datastore. It uses RabbitMQ for offline processing, HAProxy for load balancing and memcached for caching.
In early 2009, Reddit started using jQuery.[46]