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."
Implement a Batch Image Processor
This question evaluates a candidate's competency in image processing operations and parallel/concurrent programming, covering basic transformations (g...
Define and compare smart pointers
What is a smart pointer? How do smart pointers manage ownership and lifetimes compared with raw pointers? Describe common types (unique, shared, weak)...
Design hit counter for last 5 minutes
You are launching a new webpage and need a last-minute server-side metric to track popularity in real time. Implement a hit counter that supports the ...
Stream output until stop token appears
This question evaluates streaming string processing and pattern-matching skills, specifically handling token detection across chunk boundaries, bounda...
Find the longest palindromic substring
This question evaluates proficiency in string manipulation and algorithmic problem-solving, focusing on palindrome detection and substring handling wi...
Implement interval room counter and token manager
You are given two coding questions. 1) Minimum number of rooms for time intervals You are given a list of meetings, where each meeting is an interval ...
Process pod logs with global increments and pop-min
This question evaluates understanding of data structures—particularly priority queues/heaps—and techniques for efficiently handling global/bulk update...
Determine allow/deny for an IP via CIDR rules
This question evaluates understanding of IPv4 addressing, CIDR range matching, rule ordering and precedence, and algorithmic correctness in determinin...
Simulate sticky load balancer with shutdown
Problem Implement a simulator for a load balancer that routes long-lived WebSocket connections across m backend servers. You receive a sequence of tex...
Validate a Parent-Child Forest
This question evaluates understanding of graph theory concepts—specifically rooted trees, parent-child relationships, cycle detection, and node in-deg...
Find minimum cycle cost per node
This question evaluates proficiency in graph algorithms and algorithmic optimization, specifically reasoning about weighted directed graphs, cycle cos...
Solve common interview coding problems
This set evaluates algorithmic problem-solving, data structure selection, and time/space complexity analysis across common patterns such as maximum su...
Find secret word with match-count feedback
Problem You are given a list of unique lowercase words, all of the same length (e.g., length = 6). One of these words is a secret word. You can intera...
Count changed nodes between two menu trees
This question evaluates algorithmic problem-solving with tree data structures, testing competencies in hierarchical diffing, node matching by sibling ...
Implement a versioned in-memory DB with CAS and history
In-Memory DB V2: TTL + Compare-And-Set/Delete + Historical Reads Implement an in-memory database keyed by (key, field) supporting TTL, conditional upd...
Implement type AST and infer generics
This question evaluates a candidate's ability to design an abstract syntax tree representation and implement generic type inference for a small langua...
Compute streaming sliding-window minimums
Problem You are given an integer array nums of length n and an integer window size k. You scan nums from left to right (streaming). At each index i, y...
Compute top three scores per student
Compute top three scores per student You are given a list of (student_id, score) records. Return, for each student, their highest three scores in desc...
Design a max-stack with efficient operations
Design a max-stack with efficient operations Design a stack that supports push (x), pop(), top(), peekMax(), and popMax(). The popMax operation must r...
Validate IPv4 Address List
This question evaluates proficiency in string parsing, input validation, numeric boundary checks, and algorithmic complexity by requiring verification...