SAN FRANCISCO — Pillsbury Winthrop Shaw Pittman has plucked a corporate and securities partner from DLA Piper.

Armando Castro, who advises technology companies from inception to exit, joined the firm’s corporate and securities-technology practice in Palo Alto on Monday. With a focus on networking and communications, Castro will work closely with Pillsbury’s payments and cybersecurities groups.

Stanley Pierson, head of the firm’s corporate and securities-technology practice, said in a statement that Castro “adds depth and breadth” to the firm’s technology practice. Pillsbury added corporate securities partner Riaz Karamali from Sheppard, Mullin, Richter & Hampton in June 2013 and Alan Kalin from Bingham McCutchen in March.

In his 22-year legal career, Castro has worked at a various law firms in Silicon Valley, in addition to a stint in-house. He started at Wilson Sonsini Goodrich & Rosati as an associate in 1992 before moving to Brobeck, Phleger & Harrison, where he made partner in 1998. He then became general counsel at Cyras Systems, seeing the networking company through its $2.6 billion acquisition by Ciena Corp. in 2000, before returning to Brobeck Phleger in 2002. After the firm’s collapse, Castro migrated to Morgan, Lewis & Bockius, along with the bulk of Brobeck Phleger’s corporate team. From 2008 to 2012, he was a partner at Reed Smith before landing at DLA Piper.

Castro said he was searching for the right place to build his practice. “It was about me trying to find the right fit. It had to be a strong platform, where I thought I could integrate with the rest of the attorneys at the firm,” he said, adding that movement has become “more acceptable” to clients, particularly emerging growth companies or tech companies that “tend to shift every few years.”

However, Castro said he hopes Pillsbury will be his last stop. The firm’s corporate lawyers in the Valley are “well-positioned to take advantage of the clients in Northern California,” he said. Pillsbury’s corporate and securities partner Jorge del Calvo taught Castro when he was a 2L at Stanford Law School and securities and litigation enforcement partner David Furbush worked with Castro at Brobeck Phleger.

“I sincerely hope that there’s no more movement,” he said.

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