OpenGov Senior Front-End Engineer interview questions

1. Phone screen with Director of Engineering - General questions about resume, background, programming language. I mentioned my experience with ES5 and some experience with AngularJS. 2. Technical Screen - Very basic technical questions to know the depth of knowledge. 3 Another Technical Screen - Technical questions involving algorithms and data structures. We solved 2 puzzles. Interviewer was very smart and fun to discuss the problem with. 4. Onsite interview: 3 Technical rounds and 1 round of interview with hiring manager. Interviewers made lots of syntactic mistakes. One of the interviewer used unshift to remove element from an array, used push to insert data to the array and then reversed the array to present the result in right order instead of just using unshift. The same person asked me to write a function that flattens an array. I wrote it using recursion. Then he asked me to write it without recursion. When I mentioned that it becomes unnecessarily complex when you write it without recursion, he wrote it using do while loop which never compiled. In the end I got a feedback saying I lack knowledge of ES6 and my approach to solve a problem was slow. Note: It took them over a month and 4 rounds of interviews to realize that I am still getting up to speed ES6(just like thousands of developers)