Dräger Software Engineer Interview Questions
& Process

It was a pretty straightforward interview day. I had an on-site interview that lasted about 3-4 hours. First, I was in a conference room for about 2 hours with the engineering team, talking with two interviewers at a time for 30 minutes each. A total of 8 people from the team interviewed me. The interviews were mostly conversational, focusing on my resume and past experiences, rather than whiteboard coding problems. Afterwards, I met with the director, who showed me around the facilities and labs. They gave me a general overview of the role and I got to ask a lot of questions.

The interview started with some questions about my past work, like describing my recent job and whether I worked alone or in a team, and also asking why I'm interested in Amazon. Then there was a technical quiz. It included a question about finding the most repeated number in an infinite list of numbers from 0 to 100 in a file, and how to achieve that result quickly, possibly with O(1) complexity without parsing the whole array. Another question was about efficiently finding the most searched string on a search server, aiming for an O(1) result retrieval. It also asked how to implement this for clusters of servers. They also asked about the difference between GET and POST requests, function overriding vs. overloading, and abstract classes vs. interfaces. Finally, there was a question about designing OOP classes for CAR, TRUCK, BICYCLE, WHEEL, and ENGINE, and a coding task to shuffle a sorted array.

I applied online and then a recruiter set up a phone chat with the software development manager. The call was around 30 minutes long. He told me about himself and the company, and then I got to introduce myself. He asked about my past projects and how I'd implemented a data structure in one of them.