Machine Learning Engineer + Data Scientist + Software Engineer Interview Questions
Practice the exact questions companies are asking right now.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Optimize image filters on device
You are shipping an image-filter feature that must run entirely on a mobile device. Users expect preview latency below 30 ms on common phones, memory ...
Design hierarchical product classification
This question evaluates a candidate's ability to design end-to-end machine learning systems for hierarchical product classification, covering competen...
Design a feed ranking system
Design a machine-learning-based feed ranking system for a consumer product. The system should rank candidate posts or items for a user's home feed in ...
Find a secret word using match feedback
This question evaluates algorithmic problem-solving, combinatorial reasoning, and information-theoretic search strategies for narrowing a secret from ...
Build a Wordle-style game in React
Task Implement a simplified Wordle-style game as a small React app. No styling/CSS is required (plain HTML output is fine). Game rules (assume Wordle-...
Make a hard MoE router differentiable
Make a hard MoE router differentiable Differentiable Routing for Mixture-of-Experts (MoE) Context You are working with an MoE layer that routes each t...
Explain FlashAttention, KV cache, and RoPE
This question evaluates understanding of transformer attention optimizations (FlashAttention), autoregressive decoding state management (KV cache), an...
Explain CLIP, contrastive losses, and retrieval limits
Answer the following ML questions in the context of multi-modal (text–video/image) retrieval: 1) How does a CLIP-style model work conceptually (archit...
Minimum Canisters to Top Up an Exact Target
This question evaluates a candidate's grasp of dynamic programming, specifically the unbounded knapsack (coin change) pattern for finding the minimum ...
Deterministic Task Execution Order
This question evaluates a candidate's ability to model task dependencies as a directed graph and produce a valid execution order, a core graph algorit...
Design a Hosted Notebook Platform
This question evaluates system design skills around stateful compute orchestration, including control-plane versus data-plane separation, workspace li...
Explain concurrency model preference
Multithreading vs. Callbacks — Experience and Trade-offs Context You are interviewing for a Software Engineer technical screen. The interviewer asks y...
Design review system with voting and rewards
Design a Scalable Product Review System with Voting and Rewards You are designing a reviews feature for a large e-commerce marketplace. Customers can ...
Implement an asyncio-based chat server
Async Chat Server (Python asyncio) Build a TCP chat server using Python's asyncio. The server listens on a given port and serves many concurrent clien...
Compare audio preprocessing and training
Suppose you are building an audio model for a voice assistant. Compare common audio data preprocessing approaches and explain their trade-offs. For ex...
Describe a Project End-to-End
Walk through one project you worked on in depth. Explain the business problem, your specific role, the technical approach, the main trade-offs, and ho...
What kind of coworkers are hard to work with?
Behavioral question: > What kinds of people do you not like working with? Why? Interviewers are looking for maturity, self-awareness, and how you hand...
Explain classification lifecycle and CTR modeling
You are interviewing for a Machine Learning Engineer role. Discuss the following machine-learning topics in a structured way: 1. Describe one practica...
Determine validity after digit-constrained deletions
Determine validity after digit-constrained deletions You're given a string S of length n consisting only of '(' , ')' , and digits '0'–'9'. For every ...
Design an experiment for order batching
Experiment Design: Two-Order Batching Policy During Peak Hours Context DoorDash plans to test a dispatch policy that allows a dasher to pick up two ne...