Amazon CEO Andy Jassy has tapped one of the company’s top marketplace executives to be his new “shadow” advisor, the company announced Wednesday.

In a blog post, Amazon said Dharmesh Mehta, vice president of worldwide selling partner services, will become Jassy’s technical advisor in March.

The role of technical advisor, often referred to internally as a “shadow,” is one of the most sought after positions in the company. The role involves accompanying Jassy to most of his meetings to learn more about Amazon’s various businesses.

Shadow advisors typically go on to assume greater roles inside the company.

Jassy served as Amazon founder Jeff Bezos’ shadow in the early 2000s, before he went on to be CEO of Amazon Web Services.