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Prep/Companies/Juspay

Fintech · Bengaluru

J

Juspay.

Payment orchestration for merchants and banks, including the open-source Hyperswitch router, checkout SDKs, UPI stack and card tokenisation.

its questions lean on

concurrency and locking
thread-safe data structures
payment routing across gateways
OS and networking fundamentals
debugging from logs

The rounds, as candidates describe them

Online assessment and MCQA coding test on trees and graphs, then an MCQ round on aptitude, physics, operating systems and core CS.source ↗
Hackathon part ASolve a tree-locking problem.source ↗
Elimination interviewsLive coding by screen share with DSA, puzzles and core CS questions.source ↗
Hackathon part BA day-long session over Slack making the part-A solution thread-safe and fast, with granular locking.source ↗
System design and culture fitFinal onsite round.source ↗

Reported by candidates

From public interview write-ups; each links its source.

Design a thread-safe lock/unlock treeLow-level design
W05 · DAY 05 · Leader Election and Coordination →W00 · PART 5 · Operating System Concepts for System Design →reported in:LeetCode Discuss · Juspay SDE interview experience, 7 rounds (2026) ↗LeetCode Discuss · Juspay interview experience (2024) ↗LeetCode Discuss · Juspay hackathon interview experience (2023) ↗
Implement a lock without mutexes, semaphores or atomicsConcept
W00 · PART 5 · Operating System Concepts for System Design →reported in:LeetCode Discuss · Juspay Tree of Space hackathon part B discussion (2023) ↗
Debug a system from its log fileConcept
W10 · DAY 02 · Observability →W10 · DAY 05 · Incident Management →reported in:LeetCode Discuss · Juspay Product Solution Engineer, Jan 2026 ↗
How does OS process scheduling work?Concept
W00 · PART 5 · Operating System Concepts for System Design →reported in:LeetCode Discuss · Juspay 5 of 7 rounds experience (2025) ↗
Networking fundamentals deep diveConcept
W00 · PART 4 · Networking Fundamentals for System Design →reported in:LeetCode Discuss · Juspay SDE, Jul 2023 ↗

Likely, from what they build

Our pick, not a report: questions that fit Juspay's products.

Design a payment router across multiple gatewaysSystem design
SQ-18 · Razorpay Payment Gateway →W02 · DAY 03 · Circuit Breakers →W02 · DAY 01 · Timeout Hell →
Design a Payment SystemSystem design
SQ-01 · India's UPI →IP-20 · Design a Payment System →
Design idempotent payment APIsConcept
W02 · DAY 02 · Idempotency in Practice →
Design webhook delivery with retriesSystem design
W02 · DAY 04 · Webhook Delivery System →W03 · DAY 04 · Dead Letters and Poison Pills →
Design a card tokenisation vaultSystem design
W09 · DAY 05 · Security Architecture →SQ-04 · Visa/Mastercard Global Payment Network →
Design a Rate LimiterSystem design
IP-02 · Design a Rate Limiter →W01 · DAY 03 · Rate Limiting at Scale →

Study path

Every lesson the questions above point to, once, in order.

01W05 · DAY 05Leader Election and Coordination
02W00 · PART 5Operating System Concepts for System Design
03W10 · DAY 02Observability
04W10 · DAY 05Incident Management
05W00 · PART 4Networking Fundamentals for System Design
06SQ-18Razorpay Payment Gateway
07W02 · DAY 03Circuit Breakers
08W02 · DAY 01Timeout Hell
09SQ-01India's UPI
10IP-20Design a Payment System
11W02 · DAY 02Idempotency in Practice
12W02 · DAY 04Webhook Delivery System
13W03 · DAY 04Dead Letters and Poison Pills
14W09 · DAY 05Security Architecture
15SQ-04Visa/Mastercard Global Payment Network
16IP-02Design a Rate Limiter
17W01 · DAY 03Rate Limiting at Scale

Company names and logos are trademarks of their owners, shown only to identify each company. This course isn't affiliated with or endorsed by any of them.

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