Walmart Global Tech Frontend Interview Experience (SDE 3)

Note: This interview experience was contributed by a user of devtools.tech platform. You can contribute your interview experiences here and interview questions here.

Round 1: DSA & Problem Solving

This was a coding round on a LeetCode-like platform. There were two medium and one hard problem.

The questions were around:

• Comparing two linked lists
• Longest substring without repeating characters (sliding window)
• Sliding window maximum (deque-based optimization)

Takeaway: They were looking for not just the final answer, but how clearly you think and explain while coding.

Round 2: JavaScript + Web & System Design

This round went deep into real-world frontend engineering. It covered:

• JavaScript internals (closures, event loop, promises, async/await)
• Writing polyfills from scratch (Try Polyfill Questions)
• Designing browser-like features
• Performance, SSR, and SEO

Some interesting problems included:

• Implementing a Promise based retry method (Exact Question Link)
• Designing a browser history system (back/forward by N steps)
• Discussions around SSR, LCP, and performance trade-offs

Takeaway: Focus on scalability, performance, and design decisions — not just getting the code to work.

Round 3: Hiring Manager

This was more about engineering maturity and ownership:

• How to led frontend projects
• Decisions around React, state management, and build tools
• Working with designers, backend, and QA
• Managing design systems at scale
• Handling complex, data-driven UI in large e-commerce platforms

It felt more like a real engineering conversation than an interview.

Big takeaway

At the SDE-3 level, they look for people who can:

• Write solid code
• Understand how the web works
• Design scalable frontend systems
• And guide projects and people

Preparation Tips

If you’re preparing for similar roles:

• Be strong with DSA patterns (sliding window, arrays, linked lists)
• Go deep into JavaScript internals & polyfills
• Understand frontend system design — SSR, caching, hydration, performance metrics