Walmart Senior Software Engineer Level IV interview questions

Got a call from HR and the interview was scheduled for one whole day. Due to COVID times, all the interview process was virtually over zoom video call with screen sharing. The opening was for UI/Javascript developer Totally there were 4 rounds scheduled on the same day. Round1: DS & Algo - 1HR Started with array-based question Linked list based question BST and graph traversals All the questions asked was for best time & space complexity Implement getElementByID Round2: UI and JS Round - 1.5HR JS timer events and intervals JS single-threaded architecture and event loops Array-based question React virtual dom internals how will you handle memory leaks Promise based question and who to implement timeout feature for async calls Implement Redux kind of global store, (Impl Pubs-subs pattern and explain Flex architecture) Flatten deeply nested object into 1D object with '_' Disadvantage of using closure Round 3: System Design - 1HR One Puzzle was asked, 3box with apple orange puzzle Design an online game platform for Dart --- It must support single and multi-user functionality Round 4: HM Round - 1HR More about my projects and career interests Detailed discussions on my Git projects Managerial based questions on code review, teamwork, deployment, deliverables, deadlines etc 1.5 weeks later after my interview, Got a call from HR asking for HR round discussions. A week later after HR discussions, the offer letter was released. The interview process was very smooth & great. Thanks and kudos to HR team and panelists for handling it very nice during this pandemic situation.