J.P. Morgan Interview Questions
Practice 26 real J.P. Morgan interview questions for 2026. Covers all top categories — Coding & Algorithms, System Design, Software Engineering Fundamentals, Behavioral & Leadership, Machine Learning — across Software Engineer and Data Scientist roles. Real interview questions from actual interviews with detailed solutions to help your interview preparation for J.P. Morgan, with a focus on the coding-heavy screens and system-design conversations that dominate tech interviews at the firm. Expect interviews that weigh implementation speed and correctness, production-quality thinking, and domain-aware design: coding rounds and PR/code-review problems, a system or low-level design discussion, and behavioral leadership questions. For Software Engineers, recurring themes include designing URL shorteners and autocomplete APIs, concurrent/thread-safety reviews, scheduling and collision problems, latency and scalability fixes for shopping-cart or notification systems, and full-stack cloud platform designs like global rental or course-registration systems. For Data Scientists, questions trend toward model fundamentals and stats — overfitting and transformer basics, implementing KNN from scratch, distribution tests, expected-value problems, and even C++ object-lifetime or puzzle-style probablistic questions. Best prep: practice timed coding, rehearse tradeoffs in design, write clear production-ready pseudocode, and refresh statistics and ML fundamentals.
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Explain Core ML Concepts
You are interviewing for a senior AI/ML-oriented data science role at a financial institution. Answer the following foundational machine learning ques...
Implement Integer Square Root
Given a non-negative integer x, implement sqrt(x) and return the integer part of its square root, i.e., floor(sqrt(x)). Requirements: - Do not use a b...
Describe a proud project and conflict
In a behavioral interview, be prepared to discuss your previous work experience, one project you are especially proud of, and a time you had a conflic...
Review a PR for thread-safe request handling
PR review / debugging prompt (backend) You are reviewing a pull request that introduces a CustomerRequest class used by a web service to build and sen...
Design a URL shortener
Design a URL shortening service similar to Bitly. The service should accept a long URL and return a short alias, and visiting the short URL should red...
Improve shopping cart latency and stock notifications
You are given an existing e-commerce shopping cart system (web/mobile) that already supports adding/removing items and viewing the cart. The interview...
Explain Overfitting and Transformer Basics
Answer the following machine learning questions in a self-contained way: 1. What is overfitting? How would you recognize it from training and validati...
Review concurrent code quality
You are given a short code snippet during a pull-request review and asked to identify engineering issues and suggest improvements. The review focuses ...
Design an autocomplete suggestions API
Problem: Autocomplete suggestions (Trie) You are building an autocomplete feature. Input - A dictionary of n unique words words[i] (lowercase a–z). - ...
Explain C++ virtual dispatch and object lifetime
Answer the following C++ fundamentals questions. 1) Virtual function dispatch: predict output Consider this C++ program: `cpp #include <iostream> usin...
Solve tiling, probability, and nested-radical puzzles
You are given several independent math/coding puzzles. 1) Domino tiling a 2×N board You have a 2×N rectangle and an unlimited number of 1×2 and 2×1 do...
Compute ring window max and deletion indices
Part A — Ring window maximum: You are given n computers arranged in a circle, represented by an array of bits (1 = on, 0 = off), and an integer k (1 <...
Design a course registration system
System Design: Course registration () Design an online course registration system for a university. Core user stories 1. Students can: - search/bro...
Test whether samples follow a binomial distribution
You collect a dataset that you believe comes from a binomial process. Each observation is a count of successes. - You have i.i.d. samples \(x_1,\dots,...
Minimize Operations to Balance Shipments
A shop has n item types, where quantity[i] is the positive integer quantity of the i-th item type. The item types must be shipped in two non-empty con...
Answer common behavioral prompts
Behavioral & Leadership Interview — Software Engineer (Onsite) Context: You are interviewing for a Software Engineer role. Prepare concise, impact-ori...
Solve scheduling and collision problems
The interview included multiple algorithm questions in the same category: 1. Minimum concurrent resources for intervals You are given a list of t...
Count substrings and generate TOC
Solve the following two coding problems. 1. Count valid binary substrings Given a string s consisting only of '0' and '1', count how many substrings s...
Design a cloud-based global property rental platform
System design: Cloud migration for a property rental website A property dealer runs a website that lists properties (photos, location, rent details). ...
Group strings that are anagrams
Problem: Group anagrams Given an array of strings strs, group the strings that are anagrams of each other. Two strings are anagrams if they contain th...