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Generate AI-powered Juspay interview questions for all 4 rounds. Process: Functional Programming Test → Technical × 3 → HR.
From our curated bank of 10 Juspay-specific questions. The generator produces fresh AI-tailored questions each run.
What does Juspay build and what makes their engineering culture unique in India?
Tip: Juspay: payment orchestration platform (powers checkout for Amazon India, Swiggy, Ola). Unique culture: one of the few Indian companies using Haskell and PureScript in production. They deeply value functional programming — if you apply, at least understand FP basics (pure functions, higher-order functions, algebraic data types).
What is functional programming? Explain higher-order functions and immutability.
Tip: Higher-order function: takes functions as arguments or returns a function (map, filter, reduce). Immutability: once created, data cannot be changed — new values are returned instead. Why FP at Juspay: payments require correctness guarantees. Side-effect-free functions are easier to test, reason about, and run in parallel.
Design Juspay's payment router that selects the optimal payment gateway for each transaction.
Tip: Inputs: amount, payment method, merchant, user bank, time of day. Routing logic: success rate × latency score per gateway per bank+method. Fallback: if primary gateway returns error code X → retry on secondary. A/B routing: 5% traffic to new gateway to build success rate data. Config-driven: routing rules stored in DB, hot-reloadable.
What is a monad in functional programming and how does Haskell use it for error handling?
Tip: Monad: a design pattern for chaining operations that handle a computational context (error, async, state). Maybe monad: wraps a value that might be absent (like Optional in Java) — chains operations that might fail without explicit null checks. Either monad: Left (error) | Right (success) — used extensively at Juspay for payment error propagation.
How would you implement a payment retry mechanism with exponential backoff?
Tip: On transient failure (timeout, 503): retry with delay = initial_delay × 2^attempt (+ jitter). Max attempts: 3. Only retry idempotent operations (GET, PUT with idempotency key) — never blindly retry POSTs. Store retry state: attempt count + timestamp in Redis. Dead letter queue after exhaustion for human review.
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