Sierra's $950 million Series E funding round was led by Tiger and Google's GV, with participation from Benchmark, Sequoia, Greenoaks and others.

Sierra's $950 million Series E funding round was led by Tiger and Google's GV, with participation from Benchmark, Sequoia, Greenoaks and others.

The raise gives Sierra more than $1 billion to work with — capital the company says it will use to become the "global standard" for AI-powered customer experiences.