While an engineer at Facebook, Lakshman created Apache Cassandra, a popular "big data" database originally built to handle Facebook’s Inbox Search feature. Facebook gave Cassandra away as a free and open-source software project and its now a very popular database used by oodles of companies.
Lakshman went on to found Hedvig, which offers software that makes all of a company's computer storage system act is if it was just one really big, really fast hard disk. Hedvig also runs on ordinary, low-cost x86-based servers, similar to Cassandra.
Read more at Business Insider.