Backend Engineer Interview Questions
Practice 43 real interview questions for Backend Engineer roles. From companies including Bytedance, Harvey, Tesla, Roku, Arm. Covers Coding & Algorithms, System Design, Software Engineering Fundamentals, Behavioral & Leadership.
"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."
Design a Ride-Hailing Platform
Design a large-scale ride-hailing system similar to Uber. The system should support: - riders creating ride requests with pickup and destination - dri...
Explain project decisions and trade-offs
Pick one project you worked on and walk through the key technical decisions behind it. Why did you choose that architecture, design, or technology sta...
Design a Chat Analytics Backend
Design the backend of an internal analytics system for a conversational AI product similar to ChatGPT. The goal is to power an analytical metrics dash...
Compare Strings With Deletions
You are given two strings s and t. Each string may contain lowercase letters and the special character #. A # deletes the closest non-deleted characte...
How should you handle misaligned interviews?
A backend engineer prepared for a coding interview after the recruiter explicitly said the round would assess concurrency. The candidate chose Java as...
Design an Elevator Control System
Design an object-oriented elevator control system for a building with multiple floors and multiple elevators. The system should support: - Hall reques...
Solve coding and AI-assisted tasks
This interview included several algorithm problems across a phone screen, onsite coding, and an AI-assisted coding round. Solve the following tasks: 1...
Design an Instagram-like platform
Design a large-scale social media platform similar to Instagram. Users should be able to: - create accounts and follow other users - upload photos or ...
Implement ad filtering and concurrent cache
Two coding tasks were described. 1. Ad candidate filtering: You are given a list of ad candidates. Each ad has ad_id, company, topic, and score. Retur...
Replace Dashes With Nearest Letters
You are given an m x n grid containing only dash characters '-' and alphabetic letters. For every dash cell, replace it with the nearest letter in the...
Implement tag matcher and filesystem
This interview reportedly included two coding problems: 1. Tag matching in text Given a sentence and a list of tags or keywords, return the tags th...
Convert IPv4 Ranges to CIDR Blocks
Implement a function that summarizes a consecutive IPv4 address range using the smallest possible list of CIDR blocks. You are given: - start_ip: a va...
Reorder Search Results for Provider Diversity
Build a function that paginates ordered provider listings for a telehealth marketplace. Each input record is a CSV string in the format: provider_id, ...
Design booking and settlement systems
You may be asked one or more backend-heavy system design problems such as: 1. Design a reserved-seat ticketing platform similar to a concert or sports...
Implement Notification Rate Limiter
Implement should_send_notifications(user_id, timestamp) -> bool. You are given two mappings: - each user_id belongs to exactly one team_id - each team...
Design Webhooks and Metric Aggregation
The interview report described two system design rounds: a webhook delivery platform and a vehicle metrics aggregation system. Constraints & Assumptio...
Explain timing and testability concepts
For a digital implementation or backend-focused interview, explain the following concepts: 1. What are setup time and hold time? 2. How does clock ske...
Design a Therapy Matching Marketplace
Design the backend for a marketplace that matches patients with therapists. The platform should support: - Patients searching for therapists by specia...
Implement BFS and a Job Scheduler
The interview report described two coding questions: grid reveal with BFS and a concurrent periodic job scheduler. Constraints & Assumptions - For the...
Count Cross-Group Employee Pairs
You are given n employees labeled from 0 to n - 1 and a list of relationships relations, where each pair [a, b] means employees a and b belong to the ...