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Razorpay Software Development Engineer 1 Interview Experience

Software Development Engineer 1

Razorpay
April 6, 2026
17 Questions
Selected

Summary

AI Powered

The Razorpay interview process was rigorous and comprehensive, consisting of four rounds covering various technical topics. Candidates encountered challenging questions on string manipulation, JavaScript fundamentals, and system design in the first two rounds, followed by in-depth discussions on reliability and handling production issues. Overall, the difficulty level was high, reflecting Razorpay's focus on technical expertise and problem-solving skills.

1

ROUND 1

#1

Optimizing Subarray Traversal

Describe a method for optimizing a subarray traversal with a character frequency constraint. Consider the performance implications of your approach.
sliding-window
string-manipulation
Medium
#2

Finding Smallest Valid Substring

Outline an approach to find the smallest valid substring that satisfies multiple conditions. Discuss edge cases such as empty inputs and large constraints.
string-manipulation
Hard
2

ROUND 2

#1

JS Fundamentals in Payments

What are the fundamental concepts of JavaScript that are relevant in a payments context? Discuss the prototype chain.
js-fundamentals
payments
Medium
#2

Custom Implementation of Function.prototype.bind

Implement a custom version of Function.prototype.bind. Explain your implementation and any edge cases you considered.
javascript
functions
Medium
#3

Safely Serializing User Input

Write a function that safely serializes user input to prevent XSS attacks before it is rendered on a payment form. Highlight the importance of this approach.
security
xss
frontend-development
Medium
#4

innerHTML vs createElement for Script Injection

Compare the use of innerHTML and createElement for handling user inputs. Discuss the implications on security for a checkout page.
frontend-development
security
Medium
#5

Implementing Debounce

Implement a debounce function and explain the potential risks of incorrect timing on a payment form.
frontend-development
debounce
Medium
#6

Event Loop and Network Request Flow

Describe what happens from the moment a user clicks 'Pay Now' until the network request leaves the browser, including aspects of the event loop and microtasks.
event-loop
frontend-development
Hard
3

ROUND 3

#1

Building an Embeddable Checkout Widget

Design a checkout widget that can be embedded into any merchant site via a script tag. Discuss the rendering strategies and configurations required.
frontend-development
payment-processing
Hard
#2

Preventing Payment Spoofing

How would you prevent a malicious parent page from spoofing a payment success event in the checkout widget you built?
security
payments
Hard
#3

Bundle Size and Script Loading Strategy

Discuss strategies to ensure that the checkout widget loads in under 1 second on 3G networks. What elements should you focus on?
performance
frontend-development
Medium
#4

Handling CSP Restrictions

What issues may arise if the merchant's Content Security Policy (CSP) restricts inline scripts or frame-src? How would you work around these issues?
security
frontend-development
Medium
#5

Exposing Checkout Functions to Parent Namespace

Explain how you would expose razorpay.open() and razorpay.close() methods without polluting the merchant's global namespace.
frontend-development
security
Hard
4

ROUND 4

#1

Handling High-Stakes Situations

What processes do you follow when a critical bug is shipped to production? Walk through your steps post-deployment.
production
frontend-development
Medium
#2

Responding to Checkout Failures

Upon realizing that the checkout service has gone down during peak hours, describe your immediate response and actions taken in the first 10 minutes.
crisis-management
frontend-development
Medium
#3

Impact of High Transaction Volume

Explain how handling millions of transactions daily affects your thought process regarding frontend changes.
scalability
frontend-development
Hard
#4

Definition of Zero Downtime

Engage in a discussion about what 'zero downtime' truly means from a frontend engineer's perspective.
frontend-development
Medium
string-manipulationhashmapssliding-windowjs-fundamentalspaymentsfrontend-developmentsecurityrazorpay
A

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