Caesar Sengupta, Google’s payments chief and the head of the Next Billion Users initiative, is leaving the company.

“It’s time for me to see if I can ride without training wheels,” Sengupta said in a LinkedIn post Monday. He worked at the tech giant for 15 years, according to Reuters.

The Singapore-based Sengupta was also one of the key people behind the launch and success of Google Pay in India, and helped the payment app’s relaunch in the US and Singapore. Over 150 million users in 30 countries now use the payment facility.

“My last day at Google will be April 30th. I haven’t decided what I will start next,” said Sengupta in his LinkedIn post and thanked Google CEO Sundar Pichai and his leadership team for their support.

“Through his time at Google, Caesar has played a key role in starting, building and leading initiatives such as Chrome OS, Next Billion Users and Google Pay,” a Google spokesperson said in an emailed statement. “We are excited to see what he builds next and wish him the best in his new journey.”