Infosys vs Epam Systems: Interview Question Comparison

When preparing for technical interviews at large IT services firms, understanding the specific focus areas of each company can significantly streamline your preparation. Infosys and EPAM Systems both assess fundamental coding skills, but their interview question patterns reveal distinct priorities in volume, difficulty, and core topics. A targeted approach, based on these patterns, is more effective than generic study.

Question Volume and Difficulty

The data shows a stark difference in the scale and depth of question banks between the two companies.

Infosys maintains a much larger repository of 158 questions, with a balanced difficulty spread: 42 Easy, 82 Medium, and 34 Hard questions. This volume suggests that Infosys interviews may pull from a wide pool of problems, requiring candidates to be prepared for a broad range of scenarios. The significant number of Medium and Hard problems indicates an expectation to solve moderately complex algorithmic challenges, often involving optimization or multiple steps.

EPAM Systems, in contrast, has a more focused set of 51 questions, heavily skewed towards foundational concepts: 19 Easy, 30 Medium, and only 2 Hard questions. This pattern points to an interview process that prioritizes strong fundamentals and clean code over solving highly complex, obscure algorithms. The emphasis is likely on demonstrating problem-solving logic, code structure, and the ability to handle common data manipulation tasks efficiently.

Topic Overlap

Both companies heavily test Array and String manipulation, making these the absolute highest-priority topics for candidates applying to either.

• Infosys shows a strong emphasis on Dynamic Programming (DP) and Math problems. The presence of DP in a significant portion of their questions means you must be comfortable with classic problems like finding the longest common subsequence, knapsack variations, or maximum subarray sums. Math problems often involve number theory, combinatorics, or simulation based on mathematical rules.

• EPAM Systems places greater relative weight on Two Pointers and Hash Table techniques. This signals an interview style focused on efficient in-place operations and fast lookups. You can expect problems involving sorted arrays, deduplication, pair sums, and substring searches that are optimally solved with these patterns.

Here is a typical "Two Sum" problem, common at EPAM, solved with a Hash Table, and a classic DP problem more aligned with Infosys's focus:

# EPAM-style: Two Sum using Hash Table
def two_sum(nums, target):
    seen = {}
    for i, num in enumerate(nums):
        complement = target - num
        if complement in seen:
            return [seen[complement], i]
        seen[num] = i
    return []

# Infosys-style: Fibonacci using DP (Memoization)
def fib(n, memo={}):
    if n in memo:
        return memo[n]
    if n <= 2:
        return 1
    memo[n] = fib(n-1, memo) + fib(n-2, memo)
    return memo[n]

Which to Prepare for First

Your preparation order should be dictated by the breadth of coverage required.

Start with EPAM Systems if you are earlier in your interview preparation journey or want to solidify core competencies. The smaller, more fundamental question set allows you to master essential patterns like Two Pointers and Hash Tables, which are also foundational for Infosys problems. Achieving confidence here is a faster milestone.

Start with Infosys if your goal is to pass a more demanding algorithmic gauntlet or if you are interviewing with both companies. Preparing for Infosys's wider scope, especially Dynamic Programming and more complex Math problems, will inherently cover the fundamentals tested at EPAM. However, this path requires a significantly greater time investment.

In practice, a hybrid approach is efficient: build a rock-solid foundation in Arrays, Strings, Two Pointers, and Hash Tables (the EPAM core), then layer on dedicated practice for Dynamic Programming and advanced Math problems to meet the Infosys standard.

For specific question lists, visit the Infosys and EPAM Systems question banks:
Infosys Interview Questions
EPAM Systems Interview Questions