How do I prepare for DSA interviews at product companies in India?

Start with arrays, two pointers, and hashmaps. Progress to trees, graphs, and DP. Solve 150-200 curated LeetCode problems (mostly Medium). Focus on 15-20 core patterns — most interview problems reuse them. Dedicate 3-4 months alongside system design practice. Target companies like Flipkart, PhonePe, CRED, Swiggy, and Zepto in India.

What is the best way to learn System Design for software engineering interviews?

Use a structured framework: requirements → estimation → API design → HLD → deep dives → trade-offs. Master 10 core building blocks: load balancing, caching, databases, message queues, CDNs, rate limiting, consistent hashing, replication, sharding, and observability. Practice URL Shortener, WhatsApp, and Instagram Feed as case studies.

How can a software engineer in India switch from a service company to a product company?

Focus on three areas: DSA (150 curated problems), System Design (10 case studies), and behavioral interviews (STAR format). Build one end-to-end GitHub project. Target product companies in Bangalore, Hyderabad, Pune, and Delhi NCR that actively hire from TCS, Infosys, Wipro, and HCL. Expect 3-6 months of preparation.

What AI engineering skills do software developers need in 2026?

The must-have AI stack: LLM APIs (OpenAI, Anthropic, Gemini), prompt engineering, function calling and tool use, RAG systems with vector databases, AI agents using LangGraph, structured outputs with Pydantic, and production AI skills like caching, observability, and guardrails. Python is required.

How do I switch from a service-based company to a product-based company in India?

To switch from TCS, Infosys, Wipro or other service-based companies to product-based companies like Google, Microsoft, or Amazon, you need to master DSA patterns, System Design (HLD & LLD), and practice mock interviews. The Prepflix GROW Strategy gives a structured 90-day roadmap to achieve this.

Which DSA topics are asked in product-based company interviews in India?

Product companies in India primarily ask: Arrays & Two Pointers, Binary Search, Graphs, Dynamic Programming, Trees & BSTs, Backtracking, Sliding Window, and Heaps. Each topic requires understanding patterns, not just memorizing solutions.

How long does it take to crack a FAANG interview for a working professional?

For a working professional, it typically takes 3–4 months of structured preparation covering DSA, System Design, and mock interviews. With a guided program like Prepflix's Career Accelerator, students have cracked FAANG interviews in as little as 90 days.

What is System Design and why is it important for senior engineers?

System Design covers High Level Design (HLD) — distributed systems, databases, caching, messaging queues — and Low Level Design (LLD) — object-oriented design, design patterns. It is tested for SDE-2 and above roles at Google, Amazon, Microsoft, and Flipkart.

Can I prepare for product company interviews while working a 9-to-5 job?

Yes. The Prepflix Career Accelerator is designed for working professionals. Students dedicate 1.5–2 hours per day and achieve a 3–5X salary hike at top product companies within 90–120 days while holding a full-time job.

Prepflix Blog | DSA, System Design, AI & Interview Prep for Indian Software Engineers

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SD Questions

System Design Interview Questions India 2026: Top 50 Questions with Detailed Architecture Solutions

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Low Level Design

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Meta (Facebook)

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By Pranjal Jain — Jun 8, 2026 · 25 min

Java Interview Questions

Top 80 Java Interview Questions & Answers India 2026 — Core Java, Collections, Multithreading, JVM, Spring Boot

By Pranjal Jain — Jun 8, 2026 · 30 min

SQL Interview Questions

Top 60 SQL Interview Questions & Answers India 2026 — JOINs, Window Functions, Indexes, Transactions

By Pranjal Jain — Jun 8, 2026 · 25 min

Microservices Interview

Top 50 Microservices Interview Questions India 2026 — API Gateway, Saga, Kafka, Docker, Kubernetes

By Pranjal Jain — Jun 8, 2026 · 28 min

Accenture Interview

Accenture Interview Preparation India 2026 — Complete Guide for Freshers & Experienced: Aptitude, Coding, Technical, HR & Salary

By Pranjal Jain — Jun 8, 2026 · 20 min

Capgemini Interview

Capgemini Interview Preparation India 2026 — Complete Fresher Guide: Aptitude, Pseudo-code, Technical, HR & Salary

By Pranjal Jain — Jun 8, 2026 · 18 min

Goldman Sachs India

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By Pranjal Jain — Jun 8, 2026 · 22 min

Python Interview Questions

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By Pranjal Jain — Jun 8, 2026 · 28 min

Zepto Interview

Zepto Interview Preparation India 2026 — Complete SDE Guide: DSA, Quick Commerce System Design, ESOPs & Salary

By Pranjal Jain — Jun 8, 2026 · 18 min

🔵

TCS

NQT · Digital · Prime 2026

Career Guide TCS Interview Preparation India 2026 — Complete Guide for Freshers: NQT, Digital, Prime Tracks & Salary

By Pranjal Jain — Jun 8, 2026 · 22 min

JS

⚛ React

70 Q&A with Code

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By Pranjal Jain — Jun 8, 2026 · 28 min

🔷

INFOSYS

SE · SP · DSE 2026

Career Guide Infosys Interview Preparation India 2026 — Complete Guide: SE, Specialist Programmer, DSE Tracks & Salary

By Pranjal Jain — Jun 8, 2026 · 20 min

⚙️

Operating Systems

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By Pranjal Jain — Jun 8, 2026 · 25 min

💜

WIPRO

NLTH · Turbo · Elite 2026

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By Pranjal Jain — Jun 8, 2026 · 18 min

CRED

✕ RAZORPAY

Fintech · SDE · 2026

Career Guide CRED & Razorpay Interview Preparation India 2026 — Fintech System Design, DSA & Salary Guide

By Pranjal Jain — Jun 8, 2026 · 20 min

🗺️

DSA Roadmap

LeetCode · 3-6 Month Plan

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By Pranjal Jain — Jun 8, 2026 · 24 min

🟢

Career Guide Deloitte India Interview Preparation 2026 – Complete Guide (Analyst, BTA, Consultant)

June 8, 202615 min read

🤖

GenAI Engineer

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Career Guide GenAI Engineer Career Path India 2026: How to Become One, Skills, Salary & Transition Roadmap

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📉

Fresher Hiring

Crisis & Playbook 2026

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By Pranjal Jain — Jun 19, 2026 · 14 min

🏢

GCC Jobs

Global Capability Centres 2026

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By Pranjal Jain — Jun 19, 2026 · 15 min

ORACLE

IC1 · IC2 · SQL

India 2026

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SERVICENOW

IC1–IC6 · LLD

India 2026

Career Guide ServiceNow India Interview Preparation 2026: Complete SDE Guide — IC Levels, LLD, DSA & Salary

By Pranjal Jain — Jun 19, 2026 · 15 min

AMERICAN EXPRESS

Band 30–45

India 2026

Career Guide American Express India Interview Preparation 2026: Complete SDE Guide — Bands, DSA, System Design & Salary

By Pranjal Jain — Jun 19, 2026 · 15 min

SAP LABS

T1–T5 · DSA · ABAP

India 2026

Career Guide SAP Labs India Interview Preparation 2026: Complete SDE Guide — T-Levels, DSA, ABAP & Salary

By Pranjal Jain — Jun 19, 2026 · 14 min

🛡️

BGV Process

Checks & Red Flags 2026

Career Guide Background Verification (BGV) Process in India IT 2026: Timeline, What's Checked & Red Flags

By Pranjal Jain — Jun 19, 2026 · 13 min

⚖️

Counter Offer

Decision Guide 2026

Career Guide Counter Offer Negotiation Guide India 2026: How to Handle It When Your Current Employer Counters

By Pranjal Jain — Jun 19, 2026 · 13 min

📋

PPO Guide

Internship Conversion 2026

Career Guide PPO (Pre-Placement Offer) Guide India 2026: How to Convert Your Internship Into a Full-Time Job

By Pranjal Jain — Jun 19, 2026 · 13 min

🛂

Canada vs Germany

Immigration Guide 2026

Career Guide Canada vs Germany Immigration Guide for Indian Software Engineers 2026: Express Entry vs EU Blue Card

By Pranjal Jain — Jun 19, 2026 · 15 min

🔄

Internal Transfer

Amazon · Google · Microsoft 2026

Career Guide Internal Transfer & Team Switch Guide at Big Tech India 2026: Amazon, Google, Microsoft

By Pranjal Jain — Jun 19, 2026 · 14 min

⏳

Probation Period

India IT 2026

Career Guide Probation Period in India IT 2026: Duration, Confirmation Letters, Notice Period & Red Flags

By Pranjal Jain — Jun 19, 2026 · 12 min

MYNTRA

DSA · System Design

India 2026

Career Guide Myntra Interview Preparation India 2026: Complete SDE Guide — DSA, System Design & Salary

By Pranjal Jain — Jun 19, 2026 · 14 min

🤖

AI & Junior Devs

The Real Impact 2026

Career Guide AI Coding Assistants and Junior Developer Hiring in India 2026: The Real Impact and What to Do

By Pranjal Jain — Jun 19, 2026 · 14 min

🌙

Moonlighting

Legal Risk Guide 2026

Career Guide Moonlighting Policy in India IT 2026: Legal Risk, Termination Rules & How to Earn Extra Safely

By Pranjal Jain — Jun 19, 2026 · 12 min

APPLE

ICT2–ICT6 · India 2026

Career Guide Apple India Interview Preparation 2026: Complete SDE Guide — ICT Levels, DSA, Domain Depth & Salary

By Pranjal Jain — Jun 19, 2026 · 15 min

VISA & MASTERCARD

Payments · DSA · SQL

India 2026

Career Guide Visa & Mastercard India Interview Preparation 2026: Complete SDE Guide — Payments Systems, DSA & Salary

By Pranjal Jain — Jun 19, 2026 · 15 min

NVIDIA

IC1–IC6 · C++ · GPU

India 2026

Career Guide Nvidia India Interview Preparation 2026: Complete SDE Guide — IC Levels, GPU/Systems Depth & Salary

By Pranjal Jain — Jun 19, 2026 · 16 min

IBM

Band 6–10 · AI Round

India 2026

Career Guide IBM India Interview Preparation 2026: Complete SDE Guide — Bands, AI Video Round, DSA & Salary

By Pranjal Jain — Jun 19, 2026 · 14 min

CISCO

Networking · Systems

India 2026

Career Guide Cisco India Interview Preparation 2026: Complete SDE Guide — Grades, Networking Depth & Salary

By Pranjal Jain — Jun 19, 2026 · 13 min

IC1–IC6 · System Design

India 2026

Career Guide LinkedIn India Interview Preparation 2026: Complete SDE Guide — IC Levels, System Design & Salary

By Pranjal Jain — Jun 19, 2026 · 15 min

🚪

Exit Interview

Guide 2026

Career Guide Exit Interview Guide for Software Engineers India 2026: What to Say, What to Avoid & How to Protect Your Reputation

By Pranjal Jain — Jun 19, 2026 · 12 min

🏛️

GATE & PSU Jobs

vs Private Sector 2026

Career Guide GATE & PSU Government IT Jobs vs Private Sector India 2026: Salary, Security & Which to Choose

By Pranjal Jain — Jun 19, 2026 · 14 min

🔎

Research a Company

Before Joining 2026

Career Guide How to Research a Company Before Joining in India 2026: Glassdoor, AmbitionBox, Blind & Real Red Flags

By Pranjal Jain — Jun 19, 2026 · 13 min

OLA

DSA · Java · System Design

India 2026

Career Guide Ola Interview Preparation India 2026: Complete SDE Guide — DSA, System Design & Salary

By Pranjal Jain — Jun 19, 2026 · 14 min

Prepflix Blog — Free DSA, System Design & Interview Prep Articles

AI Engineering for Software Developers

From TCS/Infosys to Google, Microsoft or Apple — here's the exact roadmap.