Krack began his professional career in July 1998 as a test engineer for BMW, working on the manufacturer's emerging engine program. In 2001, he joined the Sauber Formula One team as a data analysis engineer. He was promoted to race engineer for Felipe Massa in December 2003, overseeing the driver's performance through the 2005 season. Following BMW's acquisition of the team to form BMW Sauber, Krack became Chief Race Engineer. During this period, he provided engineering guidance to a young Sebastian Vettel, supporting his 2006 practice debut in Turkey and his 2007 race debut at the United States Grand Prix. He also worked closely with Robert Kubica, contributing to the team's first victory at the 2008 Canadian Grand Prix. Krack departed Formula One at the end of 2009 after BMW decided to withdraw from the sport.
In October 2010, Krack rejoined BMW as Head of Race Engineering for their DTM program, where he oversaw the development of the M3 GT2-based car that won the drivers', teams', and manufacturers' titles in 2012. He moved to Porsche at the end of 2012 to serve as Head of Trackside Engineering for their World Endurance Championship program. He managed on-track operations for the Porsche 919 Hybrid, which achieved a victory at the 6 Hours of São Paulo and four other podiums during the 2014 season.
Krack returned to BMW Motorsport in 2014, eventually becoming Head of Race & Test Engineering, Operations & Organisation in 2018. In this capacity, he oversaw programs in Formula E, IMSA, and GT racing. By March 2021, he was appointed Head of BMW M Motorsport, directing all of the company's racing activities.
On 14 January 2022, Krack was appointed Team Principal of Aston Martin, succeeding Otmar Szafnauer. Under his leadership, the team achieved significant growth, including eight podium finishes by Fernando Alonso during the 2023 season and a fifth-place finish in the Constructors' Championship. He also oversaw the opening of the team's new technology campus at Silverstone.
On 10 January 2025, Krack transitioned to the role of Chief Trackside Officer to focus on car performance at the racetrack, absorbing duties previously held by Performance Director Tom McCullough. Andy Cowell assumed the Team Principal role. During the final rounds of the 2025 season in Qatar and Abu Dhabi, Krack served as Acting Team Principal following Cowell's re-designation as Chief Strategy Officer.
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