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 Distributed Cron Job Scheduler
Design a distributed cron scheduler that creates recurring runs, dispatches work, tracks attempts, and recovers from crashes and partitions. Address d...
Design a Rental Marketplace Backend
This question evaluates a candidate's ability to design a scalable, low-latency backend for a global vacation-rental marketplace, testing competencies...
Test and Run a Reproducible Data Science Pipeline
Design unit and integration tests for a Python data science pipeline that loads data, builds features, trains a model, and writes predictions. Add a r...
Scale a Distributed Randomized Multiset
After designing the randomized multiset on a single machine, explain how you would scale it across multiple servers. The distributed system should sup...
Implement a Stateful Trading Order Manager
Build a stateful trading order manager with deterministic command results, lifecycle transitions, bulk cancellation, and live-order display. Assign us...
Design streaming error-log counting with moving average
Design a core component in a streaming system: Input: - Multiple upstream services continuously emit log events. - Each event includes at least: servi...
Design a Metrics Ingestion Pipeline
This question evaluates a candidate's ability to design a large-scale distributed system for ingesting time-series metrics at high throughput. It test...
How do you conduct a code review exercise?
In a live interview, you are shown a short code change — a diff, a pull request, or a standalone function — and asked to produce written code review c...
Discuss a Difficult Project and Your Next-Role Goals
Prepare a manager interview response covering a difficult project and what you want from your next role. Connect real technical evidence, ownership, t...
Review and Improve a Flawed Design Document
Review and Improve a Flawed Design Document You are given a design document for a system that has important omissions or unsafe assumptions. Review it...
Explain an ML Project from Model Development Through Deployment
Prepare a data science project walkthrough that connects the prediction target and validation design to an operational decision. Explain model selecti...
Build Resilient Aggregation and Debug Routing
This onsite combined two software-engineering exercises: 1. Implement a service method that calls multiple mock downstream APIs, merges their response...
Explain How You Would Test a System
Explain how to test a system by first defining its contract, invariants, risks, and trustworthy oracles. Build a layered strategy spanning unit, prope...
Design Idempotent Due-Date and Hold Notifications
Design Idempotent Due-Date and Hold Notifications Extend a library-management system with two notification workflows: 1. A patron receives a notificat...
Design a Revenue Ranking Platform
This question evaluates a machine learning engineer's competency in designing production-scale recommendation and ranking systems that balance revenue...
Optimal Commute: Nearest Transit Distance in a City Grid
This question evaluates a candidate's ability to apply multi-source breadth-first search to a grid-based shortest-path problem. It tests graph travers...
Design a Telemetry Platform Ingesting Two Gigabytes per Second
Design a robotics telemetry platform handling two gigabytes of raw events per second. Reason through capacity, edge buffering, durable ingestion, repl...
Troubleshoot a production server outage
You are the on-call engineer responsible for a production server for the next several days. Discuss how you would approach the following: - How would ...
Design Publisher Configuration Rules
Design a supply-side advertising configuration system that manages publisher-specific rules. A publisher may own many websites, mobile apps, channels,...
Lead a Project Retrospective Discussion
Lead a Project Retrospective Discussion Walk through a significant past project as a retrospective. Explain the hardest part, how the team addressed i...