Roku Interview Questions
Practice 14 real interview questions from Roku. Covers Analytics & Experimentation, Coding & Algorithms, System Design, Behavioral & Leadership. For roles including Data Scientist, Backend Engineer, Software Engineer.
"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."
Design a high-throughput ad exchange
This question evaluates a candidate's ability to design scalable, high-throughput, low-latency distributed backend systems for real-time ad exchanges,...
Design a video-on-demand streaming service
This question evaluates a candidate's ability to design a large-scale video-on-demand streaming system, testing competencies in distributed systems ar...
Explain concurrency and distributed fundamentals
This question evaluates understanding of concurrency and synchronization in multithreaded Java, Java hashing and equals/hashCode semantics, garbage co...
Compute longest common subsequence length
This question evaluates understanding of dynamic programming and sequence processing, measuring competence in reasoning about optimal substructure, ov...
Demonstrate cross-functional collaboration and influence
Behavioral Prompt — Cross-Functional Collaboration (STAR) Provide a specific example of cross-functional collaboration with a Product Manager (PM) and...
Implement ad filtering and concurrent cache
This question evaluates algorithmic problem-solving and systems-programming skills by combining an ad candidate filtering task that tests data-structu...
Explain Bias-Variance Trade-off Simply for Stakeholders
Explain the Bias-Variance Trade-off Simply for Stakeholders You are in a data scientist interview and need to explain a core modeling concept to a non...
Explain and quantify bias-variance tradeoff
This question evaluates understanding of the bias–variance tradeoff, the expected test-error decomposition into irreducible noise, bias^2, and varianc...
Diagnose coffee-shop profit decline
You run a single-location coffee shop. In August 2025, profit dropped 18% vs July while transactions fell 4% and average check rose 2%. You have these...
Measure speaker impact without A/B testing
Your company launched an optional smart speaker on 2025-01-10. Adoption is voluntary; 6% of existing app users purchase within 60 days, and you cannot...
Describe Aligning Goals with Cross-Functional Teams
Describe Aligning Goals with Cross-Functional Teams This behavioral prompt evaluates how you collaborate with product managers, engineers, designers, ...
Measure Speaker's Impact Using Propensity Score Matching
Measure a Speaker's Impact Using Propensity Score Matching A company releases an optional smart speaker. Some users purchase and link the speaker to t...
Analyze Profit Decline: Data Collection and Hypothesis Testing
Analyze Profit Decline: Data Collection and Hypothesis Testing You manage a coffee shop whose profits have recently declined. You need to diagnose the...
Write SQL for profit, growth, retention
Write ANSI-SQL (PostgreSQL preferred) for the tasks below. Assume all timestamps are UTC and that "today" = 2025-09-01. Schema: - products(product_id ...