Software Engineer Coding & Algorithms Interview Questions
Practice 2,712 real Coding & Algorithms interview questions for Software Engineer roles. From companies including Meta, Amazon, Google, Uber, Microsoft.
"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 a secret word via match feedback
Word Guessing Game (Mastermind-style) You are given a list of unique candidate words wordlist. All words have the same length L and contain only lower...
Implement an in-memory SQL-like table
Problem Implement a simple in-memory database for one table. All values are strings. Each row is identified by a rowKey (string). Each row contains co...
Implement credit ledger with out-of-order timestamps
Problem You are implementing a GPU credit ledger that supports adding credits, charging credits, and querying balances. Requests can arrive in any tim...
Implement a Worker Hours Register
This question evaluates data structures and algorithms skills for temporal event tracking, interval arithmetic, stateful session management, ranking, ...
Evaluate an arithmetic expression
This question evaluates parsing and expression-evaluation skills, specifically handling operator precedence, integer division truncation, multi-digit ...
Find the Longest Palindromic Substring in Linear Time
Implement longest_palindromic_substring(s) and achieve O(n) time. Return the longest contiguous substring that reads the same forward and backward. If...
Implement an In-Memory File System
Implement an In-Memory File System The source reports an in-memory file-system exercise but not its exact error serialization or current-directory rem...
Identify read-only files from permission records
This question evaluates proficiency in parsing and filtering structured data by interpreting Unix-like permission strings and extracting filenames bas...
Find shortest relationship path using BFS
This question evaluates proficiency in graph representations and traversal algorithms—specifically BFS and adjacency-structure construction—for comput...
Build span trees from unordered trace spans
This question evaluates skill in reconstructing hierarchical relationships from unordered span records, testing understanding of tree structure assemb...
Detect cycles and break them in pod dependencies
You are given dependencies between software pods. Each dependency is a directed edge u -> v meaning pod u must be built/installed before pod v. Part 1...
Count islands in a binary grid
Problem You are given an m x n grid of characters where each cell is either '1' (land) or '0' (water). An island is formed by connecting adjacent land...
Compute time for virus to infect grid
This question evaluates a candidate's ability to reason about grid-based state propagation, algorithmic problem solving, and performance consideration...
Find first and last occurrence in sorted array
This question evaluates proficiency in array search algorithms and algorithmic reasoning, specifically the use of binary search techniques and careful...
Implement a versioned hash map with snapshot
VersionedHashMap (time-travel key-value store) Design and implement a data structure VersionedHashMap<K, V> backed by a hash map that supports retriev...
Answer two coding questions (SQL and DP)
This multi-part question evaluates SQL query skills (handling distinct values, aggregation and edge-case NULL results) and algorithmic proficiency in ...
Find maximum collinear points
This question evaluates understanding of planar geometry and algorithmic reasoning for identifying collinearity, including handling duplicate points a...
Build a Trust-Aware BIN Database
Build a Trust-Aware BIN Database Implement process_bin_operations(operations) for an in-memory database of card-number prefixes. A prefix identifies a...
Solve Two Backtracking Array Problems
You will solve two independent coding problems. For each problem, first discuss edge cases, then implement a correct solution, and finally explain how...
How to maximize rewards with exactly k tasks
You are assigning n independent tasks to two interns. - Each task must be done by exactly one intern. - If intern 1 does task i, you earn reward1[i] p...