MaintainX Senior Software Engineer interview questions

First interview was with HR. Didn't receive a greeting or any plesantries, just went straight into question one and so on. Found that a little off-putting. Prior to the second interview I was advised to download the mobile app and use it. Second interview was more strict with a manager that sounded like he was on a mission to make his mark in the company and demanded a lot. He asked whether I had checked out the app, which I proceeded to talk about both the things I liked and the areas I could see for improvement. I made it to the 3rd part which was the 7-day coding challenge. *Disclaimer: I looked up the other reviews on glassdoor prior to interviewing and did not like what I read, specifically about the code challenge being use as potentially unpaid solicited work. However I decided to see for myself and take what I read with a grain of salt. I spent quite a bit of time on the code challenge. Not because I found it too difficult or couldn't handle it but rather because it was a fun challenge to work on. It was also extremely subjective. There were some basic guidelines however many things were left as "show us where you shine". I fulfilled all the requirements and even did several extras hoping to show that I was more than capable of doing this work. I felt very confident in my solution and it was submitted. I received a brief template looking email saying they would not move forward with my candidacy. There was no constructive feedback or anything of use to me. This made me feel like the time and effort I had invested was completely disregarded. I insisted on receiving feedback especially after completing the longest code challenge i've ever even heard of in the industry. I have to agree with others, the challenge left me questioning the ethics of what was asked for. While I appreciated the continuity of the whole assignment, it was tailored to their domain and product so it's not a stretch to assume this could be fishing for free ideas for the company. The other interview reviews do have a general theme going on and it has been echoed over the years. The company has responded with the traditional "we strive to do better and we appologize" yet it is clear that these are simply empty words and no actions have been taken to remedy this situation. A couple weeks after this process I was talking with colleagues in the industry and they were much more informed about this company and the internal issues that are happening there. Some had previously applied while others knew of several current employees and conditions at the office. While I don't feel I should air their dirty laundry, in hindesight I am greatful that I was passed up. I highly suggest the company takes some serious actions to improve the hiring process, make this code challenge more reasonable in length and not tailored to their domain to avoid ethical constraints and above all, treat the potential candidates like humans. We spend our valuable time and hard work going through this process, the least you can do is make us feel like we are respected and our time and efforts acknowledged.