Walmart Global Tech India | SDE III | Chennai | August [offer]

I interviewed for a Software Engineer position at Walmart in Chennai, India. The interview process consisted of five rounds.

Round 1 (Low Level Design) The first round was a low-level design round. I was asked to design a calendar application with the following requirements:

• User API to create, update, or cancel their events. Create/Update operation should be successful only in case of no conflicts of resources.
• Given a user, provide an API to fetch a list of events/meetings for the given date range.
• Given a Meeting ID, provide an API to give details of invitees with their responses i.e., ACCEPT, DECLINE etc.
• For a given set of users [U1, U2,....Un] identify available time slots.
• Provide an Admin API which can book an Event/Meeting even in case of conflicting schedules.
• API to find available rooms in a specific building at a particular time-slot.

Round 2 (Java + DSA) The second round started with Java questions for the first 30 minutes. I was asked about composition, inheritance, Spring Boot, design patterns (Builder, Singleton, Factory), current application deployment architecture, and how to scale an application. The next 30 minutes were dedicated to DSA questions. I was asked to solve the following problems:

• Next greater element I
• Add one to number

Round 3 (DSA) The third round consisted of three DSA questions:

• Find Median from Data Stream
• Minimum Number of Taps to Open to Water a Garden
• Diagonal traversal of a matrix in zigzag fashion

Round 4 (Javascript + DSA) The fourth round focused on Javascript and Angular. I was asked about closures, currying, hoisting, call(), bind(), apply(), and Angular standard questions. I was also asked to solve the following DSA problem:

• Split array into chunks of a given size

Round 5 (HM Round) The final round was a hiring manager round. I was asked managerial questions and discussed the low-level design of a POS application.

Overall, the interview process was challenging but rewarding. I found the interviewers to be friendly and helpful. I received an offer and accepted it.