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.”

Amazon announced new AI tools for its independent sellers Wednesday, led by a plugin that lets them run their Amazon businesses from Anthropic’s Claude or Amazon’s own Quick assistant.

The idea is to let sellers check inventory, adjust prices and update listings without opening Seller Central, which merchants have used for years to manage their Amazon businesses. Amazon says about 90% of sellers already use some form of outside AI to run parts of their operations.

“Our vision was that they would never have to log into Seller Central,” said Mary Beth Westmoreland, Amazon’s vice president of Worldwide Selling Partner Experience, in an interview. “We would just bring it to them where they work.”

The company is making the announcement at Accelerate, its annual seller conference, taking place in Seattle this week. It’s also releasing automations that monitor a seller’s business in the background and can act on it with the seller’s approval, and an upgraded Seller Assistant that remembers a seller’s pricing patterns, inventory cycles and growth goals from one session to the next.

The stakes: Independent sellers account for more than 60% of units sold on Amazon worldwide, and the fees Amazon charges them brought in $46.8 billion in the second quarter, more revenue than AWS.

Those fees are one of the issues in the Federal Trade Commission’s antitrust case against Amazon, which accuses the company of overcharging sellers and punishing them for offering lower prices elsewhere. Amazon has denied the allegations and called the suit “wrong on the facts and the law.”

The case is set for trial in March 2027 in federal court in Seattle.

Amazon’s advertising business, which includes the sponsored listings sellers buy to promote their products, brought in $19.8 billion in the quarter, up 26% from a year earlier. When it filed the case, the FTC said advertising had become “virtually necessary for sellers to do business,” and that Amazon’s combined fees take close to half of many sellers’ revenue.

Sellers are a tough and pragmatic crowd. The loudest ovation at last year’s Accelerate went to a housekeeping fix rather than a new tool, when Amazon ended commingling, the practice of mixing identical inventory from different sellers in its warehouses.

Which agents get in: By starting to officially connect its seller tools to outside AI platforms, Amazon is loosening its grip on the technology sellers use to manage their presence in the company’s e-commerce store, although it still decides which platforms to support.

The announcement comes days after Amazon blocked Meta’s Muse, a new AI agent that can shop on behalf of consumers, from its store. Amazon says outside agents need to identify themselves and follow the rules of the sites they use.

Amazon is a major investor in Anthropic, and the AI company’s Claude models already power Seller Assistant, the AI technology built into the Seller Central portal that answers sellers’ questions and, with their approval, updates listings and prices.

The company says more integrations will follow Claude and Quick. “We’ve built this in a way that should be modular enough for us to continue to publish plugins,” Westmoreland said.

How it works: Amazon says connecting Claude takes about 60 seconds and no coding. The plugin pulls a seller’s listings, inventory levels, sales analytics and performance metrics into the outside assistant, which can then act on the account the way Seller Assistant does inside Seller Central.

Sellers choose which types of data the plugin can reach and approve each action before it’s carried out. The company says it doesn’t see the other business data in a seller’s assistant.

The plugin is in beta in Amazon’s U.S. stores, with international expansion to follow.

Among other announcements, Seller Assistant is getting a new canvas feature, a visual workspace generated on the fly from a seller’s live data. Sellers can use it to compare pricing strategies or diagnose ad campaigns, and it redraws as they ask follow-up questions.

In addition, Amazon says it’s giving every primary selling account holder worldwide a free 12-month subscription to Amazon Quick Plus, available through Dec. 31, 2026, with two additional co-workers covered at no cost.

This year’s event comes amid a leadership change in the seller organization. Amit Agarwal, a 27-year Amazon veteran who launched its India marketplace, took over selling partner services in February as Dharmesh Mehta moved to become CEO Andy Jassy’s technical advisor.