After graduating in computer sciences, Kay Grebenstein was drifting over to "The Dark Side" of software development and he's now working as a software tester and agile QA coach at ZEISS Digital Innovation (Dresden, Germany). Over the last years, he was responsible for quality assurance and software testing in many projects in different business domains (telecommunications, industry, commerce, energy sector, …). Kay has experience with both the classical as well as the agile process models.

ZEISS is an internationally leading technology enterprise operating in the fields of optics and optoelectronics. In the previous fiscal year, the ZEISS Group generated annual revenue totaling 6.3 billion euros in its four segments Semiconductor Manufacturing Technology, Industrial Quality & Research, Medical Technology and Consumer Markets (status: 30 September 2020). For its customers, ZEISS develops, produces and distributes highly innovative solutions for industrial metrology and quality assurance, microscopy solutions for the life sciences and materials research, and medical technology solutions for diagnostics and treatment in ophthalmology and microsurgery. The name ZEISS is also synonymous with the world's leading lithography optics, which are used by the chip industry to manufacture semiconductor components. There is global demand for trendsetting ZEISS brand products such as eyeglass lenses, camera lenses and binoculars.