Hippo Insurance Services Senior Software Engineer Frontend interview questions

Phone Interview was all on FrontEnd. Interviewer was very good to collaborate on a small recreation of a part of the companies public website. Onsite was a bust, no one dwelled into FrontEnd. I got asked an algorithm to rewrite isSubstring functionality which is a popular complex algorithm called either KMP or Rabin Karp. I wrote a simple substring algorithm which was based on sliding window. I was able to execute the program and it was working although it was slow. Interviewer was going no where with hints. I was not prepared to answer KMP or Rabin Karp since I omitted that from my studies.