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."
Find maximum follow depth using recursion
You are given a directed follows relationship representing a social graph: - Each record (follower_id, followee_id) means follower_id follows followee...
Can You Reach the Last Index?
This question evaluates a candidate's understanding of array traversal and reachability in sequences of jumps, along with the ability to reason about ...
Implement RLE and bit-packing compression
You are asked to implement two related compression/decompression schemes: Run-Length Encoding (RLE) and bit-packing. --- Part 1 — Run-Length Encoding ...
Find the Next Larger Palindrome
Given a positive integer n, return the smallest integer strictly greater than n whose decimal representation is a palindrome. A palindrome reads the s...
Compute time to burn tree
Given the root of a binary tree and the value of a target node that starts burning at time 0, fire spreads every minute from a burning node to its lef...
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...
Solve Shipping and Bundle-Cost Problems
This question evaluates algorithmic reasoning for scheduling and capacity planning (minimum daily shipping capacity) and combinatorial optimization wi...
Solve substring and worker assignment
The interview included two algorithm problems: 1. Shortest covering substring: Given two strings s and t, return the shortest contiguous substring of ...
Write an average-income function
This question evaluates proficiency in data manipulation and basic statistical aggregation, particularly handling missing values and computing average...
Build a Fuzzy Keyword Index
This question evaluates string-processing, text-indexing, approximate string-matching, and data-structure design skills for supporting many repeated q...
Implement Linear Regression Training
This question evaluates understanding of linear regression, mean squared error loss, gradient computation, parameter updates, and proficiency with vec...
Validate IPv4 Address List
This question evaluates proficiency in string parsing, input validation, numeric boundary checks, and algorithmic complexity by requiring verification...
Compute top-N items from log stream
This question evaluates the ability to aggregate frequencies and compute top-N results from logs, covering competencies in frequency counting, top-k a...
Parse Query Parameters Into a Map
Implement a function that parses the query portion of a GET URL and returns a map from query keys to parsed values. Input is a string that may start w...
Implement round-robin load balancer
Implement a load balancer that distributes incoming requests across N backend servers in strict round-robin order. Requirements: ( 1) Support addServe...
Implement Fibonacci with efficiency constraints
Write a function fib(n) that returns the nth Fibonacci number (0-indexed: fib(0)=0, fib(1)=1). Requirements: - Handle n up to at least 10^6. - Discuss...
Solve Tree Views, Columns, and Calculator
This multi-part question evaluates skills in binary tree traversal and view extraction, vertical column grouping and ordering of tree nodes, and parsi...
Build a validated add-sub calculator
Given a string expression, write a function that validates and evaluates it. The expression represents arithmetic using only non-negative integers and...
Solve Digit-Square and Grid BFS Problems
Solve the following coding problems. Problem 1: Digit-square convergence Given a positive integer n, repeatedly replace n with the sum of the squares ...
Find Top K Largest Elements
This question evaluates a candidate's skill in algorithmic selection and data-structure usage for extracting top-k elements from large arrays, emphasi...