Is HireStepX free to use?

Yes. Start with 2 full AI mock interviews, complete with real-time feedback, scores, and detailed performance reports. No credit card required.

How does the AI mock interview work?

Upload your resume, pick your target company and role, and choose from 10 interview types. The AI interviewer asks role-specific questions via voice, listens to your answers, asks follow-up questions, and delivers scored feedback after each session.

What types of interviews can I practice?

10 types: Behavioral, Technical, Strategic, Case Study, Campus Placement, HR Round, Panel, Management, Salary Negotiation, and Government/PSU. Each with 3 difficulty levels and mini or full session options.

Can I practice for specific companies like TCS, Infosys, or Google?

Yes. We support 200+ target companies including Google, Amazon, TCS, Infosys, Flipkart, Razorpay, McKinsey, Deloitte, and more, each with distinct interview patterns.

How is this different from ChatGPT or practicing with friends?

ChatGPT is text-only with no voice, no scoring, no resume integration, and no progress tracking. HireStepX is a purpose-built interview simulator: voice-based, resume-personalized, with detailed analytics.

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Does HireStepX work on mobile?

Yes, on any modern browser. For the best experience during mock interviews, use a laptop or desktop with a microphone.

How much does it cost compared to a career coach?

A single coaching session typically costs ₹3,000-10,000. HireStepX is ₹9 per session or ₹39/month for 5 sessions (Sprint Pack) with full AI coaching and analytics, available 24/7.

What is the recruitment process at PhonePe?

The typical PhonePe recruitment process has 4 stages: Online coding assessment on a DSA platform → Technical coding round one on data structures and algorithms → Technical coding round two on harder problems and complexity → Hiring-manager or bar-raiser round, then offer.

What are the interview rounds at PhonePe?

PhonePe typically conducts 3 interview rounds: Round 1 (60-90 min): online assessment with two to three DSA problems.; Round 2 (60 min): live coding on arrays, strings, and sliding-window or heap problems.; Round 3 (60 min): harder coding round with dynamic programming and complexity discussion..

What framework should I use for PhonePe technical interviews?

HireStepX recommends the Reason-Aloud DSA framework for this type of interview: State the brute force, name the pattern (sliding window, DP, heap), optimise with the invariant spoken out loud, then analyse time and space and mention the production edge case

On-call has gotten miserable, engineers paged 3-4 times/night, half false alarms. Walk me through the redesign you'd lead.

To answer this question well, HireStepX recommends the Reason-Aloud DSA approach: State the brute force, name the pattern (sliding window, DP, heap), optimise with the invariant spoken out loud, then analyse time and space and mention the production edge case Ground your answer in a specific real example from your own experience.

Given a stream of UPI transactions, find the top-K merchants by volume in the last 10 minutes with a sliding window. Walk me through your data structure choice.

To answer this question well, HireStepX recommends the Reason-Aloud DSA approach: State the brute force, name the pattern (sliding window, DP, heap), optimise with the invariant spoken out loud, then analyse time and space and mention the production edge case Ground your answer in a specific real example from your own experience.

Implement a rate limiter for an API that must allow 5000 requests per second per merchant. Which algorithm, and how does it behave at the boundary?

To answer this question well, HireStepX recommends the Reason-Aloud DSA approach: State the brute force, name the pattern (sliding window, DP, heap), optimise with the invariant spoken out loud, then analyse time and space and mention the production edge case Ground your answer in a specific real example from your own experience.

Find the number of ways to make a payment of amount N using given UPI cashback denominations. Then optimise the space complexity of your DP.

To answer this question well, HireStepX recommends the Reason-Aloud DSA approach: State the brute force, name the pattern (sliding window, DP, heap), optimise with the invariant spoken out loud, then analyse time and space and mention the production edge case Ground your answer in a specific real example from your own experience.

Design a pipeline that computes daily per-merchant settlement summaries from a high-volume UPI transaction stream. How do you guarantee no transaction is double-counted?

To answer this question well, HireStepX recommends the Reason-Aloud DSA approach: State the brute force, name the pattern (sliding window, DP, heap), optimise with the invariant spoken out loud, then analyse time and space and mention the production edge case Ground your answer in a specific real example from your own experience.

Write SQL to detect merchants whose daily transaction success rate dropped below 90% on any day in the last week, across all states.

To answer this question well, HireStepX recommends the Reason-Aloud DSA approach: State the brute force, name the pattern (sliding window, DP, heap), optimise with the invariant spoken out loud, then analyse time and space and mention the production edge case Ground your answer in a specific real example from your own experience.

How would you build a fraud-signal feature pipeline that computes rolling per-user aggregates (velocity, distinct devices) with low latency for scoring?

To answer this question well, HireStepX recommends the Reason-Aloud DSA approach: State the brute force, name the pattern (sliding window, DP, heap), optimise with the invariant spoken out loud, then analyse time and space and mention the production edge case Ground your answer in a specific real example from your own experience.

What coding topics does PhonePe test?

Arrays and strings, sliding window, heaps for top-K, hashing, and dynamic programming, usually framed around UPI streams, rate limiting, or settlement data rather than abstract puzzles.

How hard are PhonePe coding rounds?

Medium to hard. The bar is a correct optimal solution with a clear complexity analysis and awareness of edge cases like boundaries, duplicates, and unbounded streams.

Does PhonePe care about production concerns in coding rounds?

Yes. Because the code maps to a payments backend, interviewers often ask about idempotency, concurrency, and memory when a stream is effectively infinite.

← All companies·PhonePe·Technical

PhonePe Technical Interview Questions 2026

PhonePe's coding rounds tie classic data-structures and algorithms to payments reality: sliding-window top-K over a UPI transaction stream, rate limiting per merchant at thousands of requests per second, and dynamic-programming counting problems framed as cashback denominations.

Practice with AI voice feedback 7 questions · Technical · 2 sessions free

In 2026 expect medium-to-hard problems where the interviewer wants your optimal-substructure reasoning stated aloud, an honest complexity analysis, and a note on idempotency or concurrency because the code would sit in a real payments backend. Puzzles for their own sake are rare; in-domain framing is the norm.

About PhonePe

India's largest UPI app by volume; also offers insurance, mutual funds, gold, and merchant payments.

Products: PhonePe (UPI app) · PhonePe for Business · PhonePe Insurance · Pincode (e-commerce)
Competitors: Google Pay · Paytm · Amazon Pay · MobiKwik
Scale: Largest UPI app in India by transaction volume. Filed DRHP via SEBI confidential route. Reverse-flipped to India in 2022.

PhonePe recruitment process

01
Online coding assessment on a DSA platform
02
Technical coding round one on data structures and algorithms
03
Technical coding round two on harder problems and complexity
04
Hiring-manager or bar-raiser round, then offer

What to expect in each round

01
Round 1 (60-90 min)
online assessment with two to three DSA problems.
02
Round 2 (60 min)
live coding on arrays, strings, and sliding-window or heap problems.
03
Round 3 (60 min)
harder coding round with dynamic programming and complexity discussion.

Technical questions PhonePe asked

Sourced from 2+ candidate post-mortems. Hit Practice to answer any one with AI voice feedback.

01
Medium
On-call has gotten miserable, engineers paged 3-4 times/night, half false alarms. Walk me through the redesign you'd lead.
Practice free →
02
Hard
Given a stream of UPI transactions, find the top-K merchants by volume in the last 10 minutes with a sliding window. Walk me through your data structure choice.
Practice free →
03
Hard
Implement a rate limiter for an API that must allow 5000 requests per second per merchant. Which algorithm, and how does it behave at the boundary?
Practice free →
04
Medium
Find the number of ways to make a payment of amount N using given UPI cashback denominations. Then optimise the space complexity of your DP.
Practice free →
05
Hard
Design a pipeline that computes daily per-merchant settlement summaries from a high-volume UPI transaction stream. How do you guarantee no transaction is double-counted?
Practice free →
06
Medium
Write SQL to detect merchants whose daily transaction success rate dropped below 90% on any day in the last week, across all states.
Practice free →
07
Hard
How would you build a fraud-signal feature pipeline that computes rolling per-user aggregates (velocity, distinct devices) with low latency for scoring?
Practice free →

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PhonePe Technical Interview Questions 2026