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."
Implement concurrent structures and debug queue code
The coding rounds covered several implementation and debugging tasks: 1. Implement an LRU cache that supports get(key) and put(key, value) in constant...
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...
Find Words Containing Other Words
This question evaluates string-processing skills, knowledge of substring matching techniques and supporting data structures, and the ability to analyz...
Determine Whether a Binary Tree Is a Valid BST
Determine Whether a Binary Tree Is a Valid BST Problem Given a binary tree, determine whether the entire tree satisfies the strict binary-search-tree ...
Compute graph distance and impacted services
This question evaluates proficiency in graph algorithms and traversal (shortest-path/BFS and cycle handling), file-path/tree modeling, dependency grap...
Validate abbreviations and brackets
The coding round included two short implementation problems: 1. Abbreviation validation Given a lowercase word word and a string abbr, determine wheth...
Deep copy a linked list with random pointers
This question evaluates understanding of linked-list structures, pointer/reference manipulation, deep versus shallow copying, and the ability to analy...
Design O(1) Randomized Multiset
This question evaluates data-structure design skills, understanding of hashing and randomization for uniform sampling, handling of duplicate elements,...
Minimum Moves on a Grid with k-Cell Jumps
You are given an m x n grid. Each cell is either open or blocked: - grid[i][j] = 0 means the cell is open. - grid[i][j] = 1 means the cell is blocked....
Find top co-viewed products
You are given a list of user browsing sessions, where each session is a list of product IDs, a target_product, and an integer k. A product should be c...
Most Frequent Call Stack from Profiler Samples
This question evaluates a candidate's ability to design an efficient hashing and frequency-counting solution over sequences, along with careful handli...
Implement Caches, Undo, and Traversal
Solve the following coding tasks. For each task, define clean APIs, implement the core logic, and be prepared to explain time and space complexity. Ta...
Design a Randomized Multiset
Implement a data structure for integers that allows duplicate values and supports the following operations in expected O(1) time: - insert(val): Add o...
Implement Validation and String Compression
This question evaluates string processing, input validation, tokenization, hierarchical string manipulation, and algorithmic complexity analysis skill...
Implement a stack supporting max and popMax
Design a data structure that behaves like a stack but also supports retrieving and removing the current maximum value. Implement a class MaxStack with...
Solve Decimal Coin Change
Given a list of coin denominations represented as decimal values and a target amount represented as a decimal value, return the minimum number of coin...
Solve Maze and Suffix Problems
Solve the following two coding problems. Problem A: Find the shortest path through a maze with keys and doors You are given a 2D grid representing a m...
Implement Integer Square Root
Given a non-negative integer x, implement sqrt(x) and return the integer part of its square root, i.e., floor(sqrt(x)). Requirements: - Do not use a b...
Find the First Unique IP
You are processing a chronological stream of server hit records. Each record contains an IP address as a string. Design and implement a component that...
Generate all permutations of an array
This question evaluates understanding of permutation generation, recursion and backtracking techniques, along with skills in state-space exploration a...