🚀 Walmart Global Tech – Software Engineer III Interview Experience (Bangalore)
Process: Referral
My Experience: 3 years as SDE-II
Total Rounds: 3 (all in-person on-site, wrapped up in a single day)

📌 Round 1 – DSA Coding Round
Problem Statement:
The round focused on medium to medium-hard level DSA questions. Topics covered:

Trees (traversals, path-based problems)

Two Pointers

Sliding Window

Binary Search (variations, applications)

The interviewer expected:

Clear explanation of brute force → optimized approach

Handling of edge cases

Time & space complexity analysis

✅ Cleared and moved to next round.

📌 Round 2 – Low-Level + System Design
This was an open discussion around system design and core Java concepts. The interviewer wanted to see how I approached problems, structured thoughts, and extended solutions.

Topics discussed:

Data modelling & API design for extensibility

How to scale the system step by step

Java concepts: Multithreading, concurrency handling, synchronization

Design Patterns and SOLID principles

Sample design problems discussed:

Build an In-Memory Cache (eviction strategies, TTL)

Email Notification System (retry mechanism, async handling)

UPI-like Payment System (transaction consistency, scaling)

Ride Booking System (matching riders & drivers, scalability concerns)

Expectations:

Write code snippets (Java) where necessary

Show how design can evolve from basic → scalable

Use of appropriate design patterns

✅ Cleared and moved to final round.

📌 Round 3 – Hiring Manager Round
This was a blend of technical + behavioural:

Deep dive into my previous work experience and projects mentioned in my resume.

Questions around tech stack I worked with (Java, system design, scalability aspects).

Follow-ups on decision-making and ownership in past projects.

Some AI/ML general concept questions – to understand awareness of trending tech.

Behavioural questions on teamwork, conflict resolution, and leadership.

The discussion was conversational, with focus on how I could contribute to the team and grow in the role.

✅ Outcome
Finally, I received the offer for Walmart Global Tech – Software Engineer III (Bangalore) 🎉

It was an in-office, in-person interview process and all rounds got wrapped up in a single day.

💡 Tips for Preparation

DSA:

Focus on trees, graphs, sliding window, two pointers, and binary search.

Practice from LeetCode (Medium/Hard) and be comfortable explaining brute force → optimized approach.

System Design (LLD + HLD):

Pick common design problems like cache, notification system, booking system, payment system.

Be ready to discuss data modelling, APIs, scaling strategies, and trade-offs.

Revise design patterns (Factory, Singleton, Observer, Strategy) and SOLID principles.

Java Core:

Multithreading, concurrency (synchronized blocks, thread safety, executors).

JVM memory model and garbage collection basics.

Behavioural + Managerial:

Be clear about your projects, impact, and ownership.

Prepare examples around teamwork, challenges, and leadership moments.

AI/ML Awareness:

You don’t need depth, but knowing basic AI concepts (like supervised vs unsupervised learning, real-world use cases) helps.

✨ Hope this helps everyone preparing for Walmart/FAANG-level interviews. All the best! 🚀