EPAM | SSE | Interview Experience

EPAM Systems Interview Experience (Senior Software Engineer | 5.3 YOE)

Recently interviewed with EPAM Systems for a Senior Software Engineer position (Hyderabad). The recruiter initially contacted me through Naukri.com and scheduled the interviews. The entire process consisted of 5 rounds, including a client round.

Overall, the interview process was focused on problem-solving, Java fundamentals, backend development, and real-world system design concepts. The interviewers were particularly interested in understanding not just the solution, but also the reasoning, trade-offs, and production experience behind the answers.

DSA Questions Asked

• Container With Most Water
• Max Consecutive Ones III
• Longest Consecutive Sequence
• Find First and Last Position of Element in Sorted Array
• Group Anagrams
• Permutations
• Next Greater Element I
• Longest Palindromic Substring

Apart from LeetCode-style questions, I was also asked the following problem:

Currency Conversion Problem

Given a list of currency conversion pairs, find the minimum number of conversions required to convert a source currency into a target currency. Return -1 if conversion is not possible.

Expected approach: Graph + BFS.

Java Questions

• Java 8 Features
• Functional Interfaces
• Lambda Expressions
• Method References
• Optional
• Stream API
• Default and Static Methods
• Exception Handling
• Immutable Classes
• String vs StringBuilder vs StringBuffer
• Multithreading basics

Stream API Coding Questions

• Count frequency of elements
• Sort custom objects
• Find the second-highest salary
• Convert List to Map
• Partitioning and grouping examples

Collections & HashMap Internals

This was one of the most heavily discussed topics.

Questions included:

• How HashMap works internally
• Collision handling
• Buckets and hashing mechanism
• Load factor
• Rehashing
• Capacity growth
• Why Java 8 introduced TreeMap-like buckets (Red-Black Trees)
• equals() vs hashCode()
• HashMap vs ConcurrentHashMap
• ArrayList vs LinkedList
• HashSet internals
• Comparable vs Comparator
• Fail-Fast vs Fail-Safe Iterators

Spring Boot & Microservices

• Dependency Injection
• Bean Lifecycle
• Constructor Injection
• Spring Boot Auto Configuration
• @Component vs @Service vs @Repository
• Exception Handling
• Profiles
• Actuator
• Spring Security basics
• Service Discovery
• API Gateway
• Circuit Breaker Pattern
• Synchronous vs Asynchronous Communication
• Database Per Service Pattern
• Event-Driven Architecture

SOLID Principles & Design Patterns

Discussed with practical examples rather than definitions.

• Single Responsibility Principle
• Open Closed Principle
• Liskov Substitution Principle
• Interface Segregation Principle
• Dependency Inversion Principle

Design Patterns:

• Singleton
• Factory
• Strategy
• Builder
• Observer

Kafka

• Kafka Architecture
• Producers and Consumers
• Consumer Groups
• Partitions
• Offsets
• Rebalancing
• Message Ordering
• At-Least-Once vs Exactly-Once Delivery
• Dead Letter Queue
• Retention Policies

AWS

• EC2
• S3
• RDS
• Auto Scaling
• Load Balancer

The client round was mostly around project discussions, production issues handled, architecture decisions, scalability considerations, and past experience working on distributed systems.

Overall, I found the process moderately difficult. For anyone preparing for EPAM, I would strongly recommend focusing on Java fundamentals, Java 8 Stream API, Collections (especially HashMap internals), Spring Boot, Microservices, Kafka, AWS basics, and medium-level LeetCode problems.

Result: Cleared all rounds and received an offer.

Compensation Offered : https://leetcode.com/discuss/post/8559197/epam-sse-offer-by-anonymous_user-lc65/