HCLTech

Global IT services and consulting company.

4 Rounds ~21 Days Medium
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The Interview Loop

Recruiter Screen (30 min)

Standard fit check, behavioral questions, and resume overview.

Technical Loop (3-4 Rounds)

Deep dive into domain knowledge, coding, and system design.

Interview Question Bank

Full Stack Engineer • Behavioral • medium

Describe a time when you had a conflict with a client or a stakeholder regarding a technical decision. How did you resolve it?

#Conflict Resolution #Client Management #Communication
Practice
Full Stack Engineer • Behavioral • medium

Tell me about a time you had to deliver a critical module under a very tight deadline.

#Time Management #Pressure #Delivery
Practice
Full Stack Engineer • Behavioral • medium

How do you handle a situation where the requirements from the client are ambiguous or constantly changing?

#Agile #Adaptability #Stakeholder Management
Practice
Full Stack Engineer • Behavioral • medium

Explain a complex technical concept or a recent architectural change you implemented to a non-technical stakeholder.

#Communication #Mentorship #Business Acumen
Practice
Full Stack Engineer • Coding • medium

Perform a level order traversal of a binary tree and return the node values level by level.

#Trees #Breadth-First Search #Queue
Practice
Full Stack Engineer • Coding • easy

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

#Arrays #Hash Table
Practice
Full Stack Engineer • Coding • medium

Reverse a string without affecting the position of special characters.

#Strings #Two Pointers
Practice
Full Stack Engineer • Coding • easy

Find the first non-repeating character in a string and return its index. If it does not exist, return -1.

#Strings #Hash Table #Counting
Practice
Full Stack Engineer • Coding • medium

Merge two sorted arrays into a single sorted array without using extra space (O(1) space complexity).

#Arrays #Two Pointers #Sorting
Practice
Full Stack Engineer • Coding • easy

Detect if a linked list has a cycle in it.

#Linked List #Two Pointers
Practice
Full Stack Engineer • Coding • medium

Find the length of the longest substring without repeating characters.

#Strings #Sliding Window #Hash Table
Practice
Full Stack Engineer • Coding • easy

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

#Strings #Stack
Practice
Full Stack Engineer • Coding • easy

Write a SQL query to find the second highest salary of an employee from an Employee table.

#Database #Queries #Aggregations
Practice
Full Stack Engineer • System Design • medium

Design a URL shortening service like Bitly. Focus on the database schema and the encoding algorithm.

#Scalability #Hashing #Database Design
Practice
Full Stack Engineer • System Design • hard

Design an e-commerce checkout system that can handle high traffic during a flash sale.

#High Availability #Message Queues #Concurrency
Practice
Full Stack Engineer • System Design • medium

How would you design a scalable notification system (Email, SMS, Push) for a large enterprise client?

#Microservices #Asynchronous Processing #Third-party Integration
Practice
Full Stack Engineer • Technical • medium

Explain the Event Loop in JavaScript. How do Microtasks and Macrotasks differ?

#Asynchronous JS #Event Loop #Promises
Practice
Full Stack Engineer • Technical • easy

What is the difference between call(), apply(), and bind() in JavaScript? Provide a use case for each.

#Functions #Context #this keyword
Practice
Full Stack Engineer • Technical • medium

How do closures work in JavaScript? Can you provide a real-world scenario where you would use one?

#Closures #Scope #Lexical Environment
Practice
Full Stack Engineer • Technical • medium

Explain the Virtual DOM and how React's reconciliation algorithm (Fiber) works.

#React #Virtual DOM #Performance
Practice
Full Stack Engineer • Technical • medium

How do you manage global state in a React application? Compare Context API vs Redux.

#React #State Management #Redux
Practice
Full Stack Engineer • Technical • medium

Explain the useEffect dependency array. How do you prevent infinite loops when fetching data inside useEffect?

#React #Hooks #Lifecycle
Practice
Full Stack Engineer • Technical • medium

What are Angular Directives? Explain the difference between structural and attribute directives.

#Angular #Directives #DOM Manipulation
Practice
Full Stack Engineer • Technical • hard

How do you optimize the performance of a Single Page Application (SPA)?

#Performance #Web Vitals #Optimization
Practice
Full Stack Engineer • Technical • medium

Explain the internal working of HashMap in Java. What changes were introduced in Java 8?

#Java #Data Structures #Collections
Practice
Full Stack Engineer • Technical • easy

What are the key features introduced in Java 8? Write a snippet using Streams to filter a list of employees by age.

#Java #Streams #Lambdas
Practice
Full Stack Engineer • Technical • medium

How does Spring Boot auto-configuration work under the hood?

#Spring Boot #Architecture #Annotations
Practice
Full Stack Engineer • Technical • easy

Explain the difference between @RestController and @Controller in Spring.

#Spring Boot #REST #MVC
Practice
Full Stack Engineer • Technical • medium

How do you handle exceptions globally in a Spring Boot REST API?

#Spring Boot #Exception Handling #REST
Practice
Full Stack Engineer • Technical • medium

How does Node.js handle concurrency despite being single-threaded?

#Node.js #Concurrency #Architecture
Practice
Full Stack Engineer • Technical • hard

Explain the Saga design pattern. How do you manage distributed transactions across microservices?

#Microservices #Distributed Systems #Design Patterns
Practice
Full Stack Engineer • Technical • medium

How do you implement JWT authentication in a full-stack application? Where should you store the token on the client side?

#Authentication #JWT #Web Security
Practice
Full Stack Engineer • Technical • medium

Explain the difference between clustered and non-clustered indexes in a relational database.

#SQL #Indexing #Performance
Practice
Full Stack Engineer • Technical • medium

Compare ACID properties with BASE properties. When would you choose a NoSQL database over a SQL database?

#SQL #NoSQL #System Design
Practice
Full Stack Engineer • Technical • hard

You have a slow-running SQL query in production. What steps would you take to optimize it?

#Performance Tuning #SQL #Execution Plan
Practice

Difficulty Radar

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Meet Your Interviewers

The "Standard" Interviewer

Senior Engineer

Focuses on core competencies, system constraints, and clear communication.

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Unwritten Rules

Think Out Loud

Always explain your thought process before writing code or drawing architecture.

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