Onsite Interview Questions

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Other rounds

Visa Coding Interview: Memory Allocator Allocate/Erase

Visa memory allocator: implement allocate [0,k] and erase [1,idx] on a 0/1 array. Key strategies: segment-tree, range updates. Prepare for coding interviews.

Software Engineer, Backend EngineerEntry Level

Visa ML Coding Question: Linear Regression Implementation

Implement linear regression with gradient descent (MSE) for Visa ML interviews. Return params (incl. bias) and per-epoch loss history; see tips and expected outputs.

Machine Learning Engineer, Data ScientistEntry Level

backend system design

Visa

Stripe

Mastercard

Visa System Design: Scalable A/B Experiment Service

Build a scalable A/B experiment service for Visa: deterministic variant assignment, admin overrides, multi-tenant data model, logging, and rollout APIs. Guide

Software Engineer, Backend EngineerMid Level

backend system design

WalmartLabs

Twitter

WalmartLabs System Design: Multi-Region Notification Service

Design a multi-region notification service for WalmartLabs — high availability, low latency. Learn architecture, failover, routing, and monitoring to prep.

Software Engineer, Backend EngineerMid Level

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