I was invited to an on-site interview, believing that my tech stack aligned with what they were looking for based on the job posting. However, after the initial interview, I discovered they were seeking expertise in a specific tech stack that wasn't mentioned in the job posting. They didn't even conduct an initial screening call to clarify these requirements, which felt like a waste of time. Additionally, I got the impression they might offer a low salary rate because they kept asking why my salary was high at my previous company.