1. DS algo. (sliding window etc..) 2. Writing polyfills. (reduce, promise) 3. Other js based questions like scope, reusability etc.. 4. Make a counter which will reset, play & pause. Can use JS or any framework required. 5. What performance points will be highlighted while working with grids. 6. How to make reusable components using vanilla JS. 7. Service workers 8. Ever worked on reusable components 9. HLD (autocomplete) 10. Working of react 11. What you did in case of conflict 12. Other behavioural questions.