Senior+ Coding & Algorithms Interview Questions
Senior+ coding rounds don't just test whether you can solve the problem — they test whether you choose the right approach, reason cleanly about complexity, and handle the follow-up that scales the input or changes a constraint. These coding and algorithms questions were all reported from senior-level interviews, so they sit at the harder end of the difficulty band: graph problems with twists, non-obvious dynamic programming, and optimization questions where the naive solution times out. Drill them to sharpen the judgment senior+ interviewers are really evaluating: picking the right data structure on the first try and explaining the trade-off out loud. Most include a detailed solution that covers the reasoning, not just the code.
"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."
Merge Overlapping Time Ranges
This question evaluates a candidate's ability to work with interval merging, a core array and sorting problem in technical interviews. It tests unders...
Merge Keyed N-Ary Trees
Merge Keyed N-Ary Trees An N-ary tree node contains a unique string key among its siblings and a list of children. Implement merge_trees(a, b) for two...
Design a Workspace Resource Manager
This question tests a candidate's ability to design and implement a tree-structured data model with efficient CRUD operations in memory. It evaluates ...
Find Maximum Eastbound City Visits and Parse CSV
The first problem evaluates algorithmic reasoning about ordering constraints and subsequence selection, testing skills in sequence algorithms, multidi...
Count Subsequences That Move Between Positions
Practice a Visa coding interview problem focused on count subsequences that move between positions. The prompt emphasizes edge cases, clean implementa...
Implement a Simplified DNS Resolver
This question evaluates understanding of DNS semantics (name normalization, A and CNAME records, alias chains and cycle detection), robust error handl...
Merge Overlapping Time Intervals
You are given a list of closed time intervals. Each interval is represented as [start, end], where start <= end. Write a function that returns the sma...
Find a Black-Box Convex Function Minimum
You are given access to a black-box function F(x): each call returns the function value at a real number x. You are also given a search interval [a, b...
Find Any Available Meeting Room
You are given multiple meeting rooms. For each room, the existing bookings are represented as a list of non-overlapping time intervals sorted by start...
Solve Subarray Sum and Local Minimum
Two coding problems were reported in the same phone-screen round: 1. Count target-sum subarrays. Given an integer array nums and an integer k, return ...
Find Words in a Character Grid
Implement findWords(board, words) for a word-search game. You are given an m x n grid of lowercase English letters and a list of lowercase dictionary ...
Implement SQL Table and DNA Ordering
Two independent coding exercises were asked. Solve both. Problem A: CSV-backed in-memory table Build a tiny in-memory relational table initialized fro...
Infer an Unknown Alphabet Order
You are given a list of words that is already sorted according to an unknown alphabet. Derive one valid ordering of the characters in that alphabet. R...
Solve Dependency, Prefix, and Cache Problems
Solve the following three coding problems. Problem 1: Determine Whether All Tasks Can Be Completed You are given numTasks, the number of tasks labeled...
Check Whether Two Strings Are Anagrams
Problem Implement are_anagrams(a, b). Return true exactly when a and b contain the same lowercase English letters with the same multiplicities, possib...
Compute User Login Streaks
This question evaluates SQL proficiency in processing event logs for time-series analysis, encompassing date arithmetic, deduplication of same-day eve...
Find Business Degrees of Separation
Implement a feature for a small-business network. QuickBooks has data showing business relationships, such as one business regularly buying goods or s...
Optimize a Fifteen-Sum Card Strategy
This question evaluates algorithmic problem-solving, debugging, simulation-based testing, and strategy optimization using techniques such as search, m...
Extend a Maze Solver
This question evaluates competence in graph search and state-space modeling, specifically BFS-based pathfinding, constrained traversal rules (directio...
Review Preprocessing Code and Tests
This question evaluates a candidate's competency in data-science engineering tasks including code review, data preprocessing techniques (outlier handl...