Senior+ Interview Questions
These are real interview questions reported by candidates interviewing at the senior+ level (E5/L5 and above) across top tech companies. Senior+ loops raise the bar in two places most: system design, where you're expected to drive the architecture and defend trade-offs, and behavioral rounds, where interviewers probe scope, ambiguity, and how you've led without authority. The coding bar stays high but matters less than your ability to reason about scale. Every question here was asked in an actual senior+ interview, and most come with a detailed model answer so you can see what a strong senior+ response covers — not just whether it's correct, but whether it operates at the right altitude.
"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."
Implement trie-based autocomplete
This question evaluates understanding and implementation of trie data structures for prefix-based retrieval, testing competencies in string algorithms...
Answer Staff-level leadership scenarios using STAR
Behavioral prompts (Staff/L6) Provide structured answers (e.g., STAR) for scenarios like: 1. Most important technical decision you drove: how you deci...
Compute dasher pay from deliveries
Given a list of delivery events for dashers (e.g., dasherId, pickupTime, dropoffTime, distance, tip, and optional bonuses) and a set of pay rules (e.g...
Design a secure ML data platform
System Design: Secure, Ethical, Multi‑Tenant ML Data and Inference Platform Context Design a cloud-based ML platform used by multiple internal product...
Answer ownership and ambiguity behavioral questions
Answer behavioral interview prompts for a Data Scientist working in risk or product analytics: 1. Tell me about a time data changed a decision. 2. Whe...
Evaluate an ML feature launch
You are interviewing for a Technical Program Manager product/technical decision case. Answer this prompt in a structured way: Suppose Azure IoT Edge i...
Print a binary tree as aligned text
Implement a function that prints (or returns) an ASCII layout of a binary tree. Requirements: - Each node has a string value (assume it contains no sp...
Explain why IG Story usage exceeds Facebook
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Describe something you did to be inclusive
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Explain Shell Script Line-by-Line for Data Science Workflows
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Compute invalid event percentage by pixel
Context You work on an ads pixel instrumentation platform. Each pixel emits events throughout the day; some events are missing (not observed) and some...
Design device telemetry pipeline for real-time and batch
Design a distributed system that ingests telemetry from millions of devices and supports both: - Real-time analytics (near-real-time dashboards/alerts...
Debug distributed-system performance problems
You are asked: “If a distributed system has a performance problem (latency/throughput regression), how would you approach it?” Describe a practical, s...
Implement User Sessionization From Event Stream
You are building a backend data-processing component that consumes a stream of newline-delimited JSON events. Each event represents a user sending a m...
How would you measure causal impact?
Answer the following two analytics interview prompts. Constraints & Assumptions - For causal impact, separate prediction from causal identification. -...
Describe using customer data
Describe using customer data Tell me about a time you used customer data to shape or build a product. How did you identify the customer problem, what ...
Merge two sorted arrays in-place
You are given two integer arrays sorted in non-decreasing order, and two integers m and n: - nums1 has length m + n. The first m elements of nums1 con...
Implement bootstrap mean and variance
This question evaluates a candidate's ability to implement bootstrap resampling and compute statistical estimates for the sampling distribution of the...
How would you test billboard effectiveness?
This question evaluates experimental design, causal inference, statistical power/sample-size calculation, and marketing measurement competencies relev...
Estimate one-child household probability
You survey 100 children at a school and ask how many children are in their family. The responses are: - 50 children say their family has 1 child. - 20...