Open source was always at the heart of our development at LinkedIn. For example, our search engine is built on Lucene with an extension which we contributed back to the community. This is also true of our Data Infrastructure, where some of our core components such as Voldemort and Kafka were developed from the outset with the intent to be open sourced.
Why do we do it? Why do we open source? Simply put, sharing knowledge and recognizing that we are all part of a broader community is part of our core culture at LinkedIn. Contributing back to the open source community is on one side forcing us to write better code and on the other reaching out to the best, brightest and most interested individuals to explore what's new and help us further build our components.
Take a look at some of our projects and contribute where you believe you can make an impact.