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."
Design a replicated key-value store with quorums
Design a distributed system that replicates key–value pairs across multiple replicas. The interviewer wants to focus on replication, quorums, and fail...
Search Words and Phrases in a Large Line-Oriented File
Search Words and Phrases in a Large Line-Oriented File A text file contains one sentence per line and may be much larger than memory. Design an API th...
Design an ads data model
This question evaluates a candidate's ability to design scalable data models and system architecture for an ads platform, including entity relationshi...
Diagnose a dip in approval/conversion rate
You are a Staff Data Scientist analyzing a time series metric for a payments/fintech product. Data: Daily (or weekly) time series from Jan 2013 to Jan...
Assess Amazon Leadership Principles in Behavioral Interviews
Assess Amazon Leadership Principles in Behavioral Interviews Scenario Amazon Data Scientist (often L5) onsite — the Leadership Principles (LP) behavio...
Correct length-biased sampling from family-size survey
In a town, you visit a school and ask 100 kids: “How many children are in your family?” You observe: - 50 kids say their family has 1 child - 20 kids ...
Query departments and top earners
This question evaluates proficiency in relational data manipulation, including multi-table joins, grouping and aggregation to identify departments wit...
Lead a deep dive on your most complex project
Past project deep dive (Staff/L6) Pick the most complex system you’ve worked on and be prepared for a 30–45 minute deep dive. Expect probing questions...
How do you resolve stakeholder conflict?
For a Staff Data Scientist role, describe how you work with cross-functional partners such as product managers, engineers, and business leaders. Give ...
Debug React Sorting, Persistence, Routing, and Accessibility
Prepare for a HackerRank software engineering interview question about debug react sorting, persistence, routing, and accessibility. The prompt highli...
Design Internal Chat and Re-engagement Emails
Design an internal chat system for an event marketplace company. Requirements: - Employees can send and receive one-to-one messages in real time. - Cl...
Discuss Projects and Tradeoffs
You are asked to do a deep dive on two past software projects. For each project, explain: 1. The business or engineering problem. 2. Your exact role, ...
Design an Event Recommendation Engine
You are building an email marketing recommendation engine for a ticketing marketplace. The marketplace has many users and many events. The engine shou...
Design first-time Kubernetes deployment in new cloud
This question evaluates system design and cloud platform engineering skills focused on first‑time Kubernetes deployment, covering account bootstrappin...
Present a Previous Project Deep Dive
Prepare a technical deep-dive presentation about a previous project you worked on. Choose a project with enough scope and complexity to support a Staf...
Settle Group Expenses with Transfers
You are given a list of group expense transactions from a trip. Each transaction contains: - payer: the person who paid the full amount. - amount: the...
Explain an Innovative Analytical Method You Introduced
A reported hiring-manager screen repeatedly asked about innovative methods used in the candidate's work, but did not preserve the exact wording. Use t...
Applied Machine Learning Assessment: Metrics, Evaluation, and NLP Fundamentals
Reason through an applied machine-learning assessment covering annotation agreement, model metrics, reproducibility, NLP basics, ranking metrics, and ...
Investigate marketplace metrics and experiment rollout
You are interviewing for a Senior Data Scientist role at a two-sided marketplace like Instacart, where customers place delivery orders and shoppers ch...
Describe a failure and a success
Questions 1. Tell me about a time you failed (or something didn’t go as planned). What happened, what did you learn, and what would you do differently...