Ciena UI Developer
Summary
I interviewed for a UI Developer role at Ciena, undergoing a 90-minute technical round focused on advanced JavaScript, React, Redux, and two coding challenges: implementing a call polyfill and counting continuous characters in a string using reduce. I did not receive a response from the recruiter afterward.
Full Experience
My interview experience at Ciena for the UI Developer position involved a comprehensive 90-minute technical round. The discussion covered a wide array of front-end development concepts, starting with advanced JavaScript topics such as higher-order functions, pure functions, and the intricacies of call, apply, and bind methods. We then moved into React, exploring higher-order components, pure components (both functional and class-based), shallow vs. deep comparison, various hooks (useEffect, useRef, and their specific use cases), and how to prevent unnecessary component re-renders.
Redux was also a significant part of the interview, where I was asked about its three principles, how to write a reducer, the use and advantages of middleware, and the in-depth flow of how Redux identifies which reducer should be called. Additionally, I was presented with two coding challenges: one to create a polyfill for the call method and another to write a program using the reduce method to count continuous characters in a string, for example, transforming 'aaabbccaa' into '[{a:3}, {b:2}, {c:2}, {a:2}]'. Unfortunately, after this round, I never received any further communication from the recruiter.
Interview Questions (2)
Implement a polyfill for the native JavaScript call method.
Write a program using the reduce method that takes a string as input and returns an array of objects, where each object contains a character and its continuous count. For example, if the input is 'aaabbccaa', the output should be '[{a:3}, {b:2}, {c:2}, {a:2}]'.