eBay vs Coupang: Interview Question Comparison

When preparing for technical interviews at major e-commerce companies, understanding the specific patterns and expectations of each can significantly streamline your study process. eBay and Coupang, while both operating in the online retail space, present distinct interview landscapes in terms of question volume, difficulty distribution, and core topic emphasis. A targeted comparison reveals how to allocate your preparation time effectively.

Question Volume and Difficulty

The overall volume of documented questions is similar, but the difficulty distribution differs meaningfully.

eBay lists approximately 60 questions, categorized as Easy (12), Medium (38), and Hard (10). This breakdown suggests a strong focus on Medium-difficulty problems, which are typical for assessing core algorithmic reasoning and clean code implementation. The presence of 10 Hard questions indicates you must be prepared for complex scenarios, often involving optimization or combining multiple concepts.

Coupang lists about 53 questions, with a starker distribution: Easy (3), Medium (36), and Hard (14). The near-absence of Easy questions and the higher count of Hard problems signal that Coupang's interviews may have a higher baseline difficulty. You are expected to handle Medium problems reliably and be thoroughly prepared for challenging algorithmic puzzles.

This contrast means that for eBay, a solid grasp of Medium fundamentals is paramount, while for Coupang, you must dedicate substantial time to mastering advanced Hard problem patterns.

Topic Overlap

Both companies heavily test foundational data structures, but Coupang places a significant additional emphasis on Dynamic Programming.

Shared Core Topics: Array, String, and Hash Table problems form the backbone of interviews at both companies. These often involve tasks like two-pointer techniques, sliding windows, substring searches, and frequency counting. Sorting is frequently a required step within these solutions.

# Example: A common two-pointer problem (Valid Palindrome)
def isPalindrome(s: str) -> bool:
    l, r = 0, len(s) - 1
    while l < r:
        while l < r and not s[l].isalnum():
            l += 1
        while r > l and not s[r].isalnum():
            r -= 1
        if s[l].lower() != s[r].lower():
            return False
        l += 1
        r -= 1
    return True

Key Differentiator: The most notable difference is Coupang's explicit listing of Dynamic Programming as a top topic. This implies a high probability of encountering classic DP problems (e.g., knapsack, longest increasing subsequence, string edit distance) or problems requiring optimal substructure thinking. eBay's listed topics do not highlight DP as prominently, though it may appear within Medium or Hard problems.

# Example: A foundational DP problem (Climbing Stairs)
def climbStairs(n: int) -> int:
    if n <= 2:
        return n
    dp = [0] * (n + 1)
    dp[1], dp[2] = 1, 2
    for i in range(3, n + 1):
        dp[i] = dp[i - 1] + dp[i - 2]
    return dp[n]

Which to Prepare for First

Start with eBay. Its emphasis on a broad set of Medium problems across Arrays, Strings, and Hash Tables provides an excellent foundation for any technical interview. Mastering these will build the speed and pattern recognition needed for most coding assessments. Once comfortable, you can tackle eBay's Hard questions and the specific Sorting patterns.

Then, transition to Coupang. Use your established foundation and add intensive practice in Dynamic Programming. Systematically work through DP problem patterns, from 1D to 2D formulations. Given Coupang's higher proportion of Hard questions, also prioritize solving complex problems that may combine DP with other data structures.

In summary, eBay's profile is ideal for building core competency, while Coupang's requires deepening that skill set with advanced optimization techniques. Prepare for eBay first to create a strong base, then layer on Coupang's specific demands.

For detailed question lists, visit the eBay and Coupang company pages: eBay, Coupang.