A longtime Microsoft engineering leader who was previously a Copilot chief technology officer is joining Amazon Web Services to work on its competing AI tools for coding and workplace productivity.
Pedram Rezaei, a nearly 20-year Microsoft veteran who was most recently a corporate vice president on the Microsoft Superintelligence team, starts Monday as a distinguished engineer in the AWS Agentic AI and Emerging Technologies organization, led by Swami Sivasubramanian.
Rezaei will work initially on Kiro, the AWS coding tool, and Quick, Amazon’s AI assistant for workplace tasks, Sivasubramanian wrote in a memo to his team Monday. “He is a hands-on engineer who is still in the code every day, and he plans to keep it that way here,” he added.
Kiro’s user count doubled from the first quarter to the second, and monthly AI users for Quick grew fourfold, according to the memo. Rezaei’s plan for his first few months is to “meet people, learn how things work here, and ship something real,” Sivasubramanian wrote.
Sivasubramanian’s organization was expanded in July to include emerging technologies, part of a broader reshuffling of Amazon’s AI teams.
The hire comes as Amazon and Microsoft compete more directly in AI tools for work. Microsoft last month unveiled an all-in-one Copilot app that combines chat, coding and agents, its answer to OpenAI and Anthropic. Amazon made its Quick desktop app generally available in September and brought its main features to mobile.
Rezaei joined Microsoft in 2006 and held senior technical roles on Power BI, Dynamics 365, Cortana, Bing and Azure Maps before moving to Copilot, according to his LinkedIn profile. He became Copilot’s CTO in February and moved to the Microsoft Superintelligence team in June, according to the profile. Sivasubramanian’s memo said Rezaei was most recently working on training foundation models.
We’ve contacted Microsoft for comment on his departure.
Rezaei is the latest Microsoft executive to move to AWS this year. Shawn Bice returned to AWS in May from a security role at Microsoft to lead its Automated Reasoning Group.
In his memo Monday, Sivasubramanian also told his team that two longtime AWS engineers, Marvin Theimer and Reto Kramer, have returned to work on neurosymbolic AI and automated reasoning, which he called “one of our biggest bets for the future.” Both came back from Microsoft, according to their LinkedIn profiles.
Neurosymbolic AI pairs large language models with rule-based systems that can check whether an AI agent is following a company’s policies and procedures.
Speaking at Madrona’s IA40 Summit in Seattle last week, Sivasubramanian said nearly every CIO and CEO raises the same question about AI agents. “How do I know it is always going to obey all my rules and regulations?” he said. “This is a real concern.”
Solving that problem “actually unlocks so many use cases for all these enterprises,” he added.
Theimer, an AWS distinguished engineer for nine years before leaving in 2022, joined Microsoft in July 2024 as a corporate vice president and technical architect and stayed until March. It was his second stint at the company, where he worked from 1998 to 2006. He rejoined AWS in July as a vice president and distinguished engineer.
Kramer, who led an automated reasoning team at AWS before leaving in 2023, joined Microsoft in September 2025 as vice president of Security Platform & AI and stayed until May. He rejoined AWS in September as vice president of applied science.
Sivasubramanian hinted at more hires to come, writing that Rezaei joins “as we continue to build out our technical leadership team to help take on the ambitious work we have planned.”
