HomeCoursesMachine Learning Coding Interview Questions

Machine Learning Coding Interview Questions

A curated list of problems to prepare for Machine Learning coding interviews—covering data prep, model building, optimization, and evaluation.

Join 2.7M developers at

Overview

Content

Reviews

In Machine Learning coding interviews, you are asked to build a classifier from scratch, optimize feature selection for speed, or diagnose why a pipeline breaks during deployment. These challenges reflect the actual coding tasks ML engineers and applied scientists face. You'll work through problems that expose data leakage, test your ability to scale training jobs, or require you to build a complete preprocessing pipeline on noisy input. This isn’t just model accuracy—it’s model durability, clarity of logic, and readiness for production. Whether you're aiming for roles in research-driven teams or engineering-heavy ML platforms, this prep helps you write code that works and explain decisions that hold up in Machine Learning coding interviews.

In Machine Learning coding interviews, you are asked to build a classifier from scratch, optimize feature selection for speed, o...Show More

WHAT YOU'LL LEARN

Coding ML algorithms from the ground up—no libraries, just logic.

Transforming raw data into usable features, while handling edge cases like imbalance or leakage.

Designing pipelines that are modular, testable, and efficient.

Debugging issues like exploding gradients, overfitting, and training crashes.

Explaining the why behind your code: trade-offs in interpretability, runtime, and accuracy.

Coding ML algorithms from the ground up—no libraries, just logic.

Content

Machine Learning Coding Questions

40 Lessons

Encode and Decode Strings

Next Palindrome Using Same Digits

Repeated DNA Sequences

Find the Longest Substring Having Vowels in Even Counts

Longest Common Prefix

Valid Parentheses

Remove Duplicates from Sorted List

Longest Substring without Repeating Characters

Isomorphic Strings

Detonate the Maximum Bombs

Merge Two Sorted Lists

Missing Number

Find All Duplicates in an Array

Best Time to Buy and Sell Stock

Interval List Intersections

K-th Smallest Prime Fraction

Median of Two Sorted Arrays

Sum of Two Integers

Reverse Integer

Valid Palindrome II

Next Greater Element I

Fraction to Recurring Decimal

Permutations II

Subsets

Binary Search

Sort Array By Parity II

Custom Sort String

Insert Interval

Split Array Largest Sum

Frequency of the Most Frequent Element

Largest Odd Number in String

Delete N Nodes After M Nodes of a Linked List

Developed by MAANG Engineers

Every Educative lesson is designed by a team of ex-MAANG software engineers and PhD computer science educators, and developed in consultation with developers and data scientists working at Meta, Google, and more. Our mission is to get you hands-on with the necessary skills to stay ahead in a constantly changing industry. No video, no fluff. Just interactive, project-based learning with personalized feedback that adapts to your goals and experience.

Trusted by 2.7 million developers working at companies

"These are high-quality courses. Trust me. I own around 10 and the price is worth it for the content quality. EducativeInc came at the right time in my career. I'm understanding topics better than with any book or online video tutorial I've done. Truly made for developers. Thanks"

Anthony Walker

@_webarchitect_

"Just finished my first full #ML course: Machine learning for Software Engineers from Educative, Inc. ... Highly recommend!"

Evan Dunbar

ML Engineer

"You guys are the gold standard of crash-courses... Narrow enough that it doesn't need years of study or a full blown book to get the gist, but broad enough that an afternoon of Googling doesn't cut it."

Software Developer

Carlos Matias La Borde

"I spend my days and nights on Educative. It is indispensable. It is such a unique and reader-friendly site"

Souvik Kundu

Front-end Developer

"Your courses are simply awesome, the depth they go into and the breadth of coverage is so good that I don't have to refer to 10 different websites looking for interview topics and content."

Vinay Krishnaiah

Software Developer

Hands-on Learning Powered by AI

See how Educative uses AI to make your learning more immersive than ever before.

Personalized Interview Prep

Skip the LeetCode grind with a custom roadmap that adapts to your goals. Hands-on practice for Coding Interviews, System Design, and more.

Mock Interviews

Test your skills in a simulated interview setting. Receive personalized feedback based on your performance. Available for Coding Interviews, System Design, and more.

AI Prompt

Build prompt engineering skills. Practice implementing AI-informed solutions.

Code Feedback

Evaluate and debug your code with the click of a button. Get real-time feedback on test cases, including time and space complexity of your solutions.

Explain with AI

Select any text within any Educative course, and get an instant explanation — without ever leaving your browser.

AI Code Mentor

AI Code Mentor helps you quickly identify errors in your code, learn from your mistakes, and nudge you in the right direction — just like a 1:1 tutor!

Free Resources

FOR TEAMS

Interested in this course for your business or team?

Unlock this course (and 1,000+ more) for your entire org with DevPath