A top Cisco executive is leaving the company.

Zorowar Biri Singh, the networking giant’s chief technology officer and a member of CEO Chuck Robbins’s leadership team, will exit by the end of this month, a Cisco spokesperson said.

Cisco did not explain why Singh is leaving the company, but said that his departure has something to do with an “updated alignment” of the company’s engineering teams that occurred last week.

“Cisco is making the decisions needed for innovation, speed, and growth across our portfolio,” wrote the spokesperson in an email. “Earlier this week we announced to employees an updated alignment of our engineering teams. We believe these changes will help us simplify our development efforts and accelerate delivery of value for our customers.”

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Trade publication CRN first reported the news of Singh’s upcoming departure.

Robbins picked Singh to become CTO in July, when Robbins became CEO, replacing long-time Cisco CEO John Chambers.

Cisco csco did not say whether it has named a new CTO, but it said that the company is reorganizing its “engineering and development efforts” under executives Rowan Trollope and David Goeckeler, who were recently appointed to Robbins’s executive leadership team.

Prior to joining Cisco last year, Singh was a venture capitalist at Khosla Ventures and once led Hewlett-Packard’s struggling cloud computing business from 2011 through 2013. Singh was also IBM’s ibm vice president of cloud computing before he left to join Hewlett Packard hpe .

Several longtime Cisco executives have recently left the company amid the networking giant’s shift to adapt in a rapidly changing technology landscape in which companies are buying less data center hardware like Cisco switches and routers and more cloud computing services from businesses like Amazon Web Services amzn and Microsoft msft .

Part of Cisco’s plans to adapt is to transition to a software-subscription business whereby the company sells more data analytics and cybersecurity services instead of just networking gear. As Robbins explained during the year’s Fortune Brainstorm Tech conference, a software-subscription business model would help Cisco better-forecast future sales.

Many of the Cisco executives who have recently departed played big roles in scouting and founding startups that, after being acquired, went on to create some of Cisco’s most popular networking hardware devices, like its lineup of switches. In recent years, however, sales of those devices have declined or their growth has slowed.

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In its fourth quarter earnings, Cisco’s routing business declined 6% year-over-year to $1.9 billion in sales while its switching business was up 2% to $3.8 billion during the same time period.

In August, Cisco said it would cut 5,500 jobs as part of its broader reorganization.