Frontend Engineer Interview Questions
Practice 55 real Frontend Engineer interview questions for 2026 — real interview questions from actual interviews with detailed solutions. This collection targets Frontend Engineer interview questions and practical interview preparation across companies currently hiring heavily for frontend talent, including Toma, Uber, Coinbase, and Robinhood. Expect live React/TypeScript coding, component-level problems, and end-to-end tasks that prove you can ship resilient UI under constraints. What makes frontend loops distinctive is their emphasis on product-quality engineering: component design and state management, DOM and asynchronous behavior, and performance/accessibility under load. At Uber interviews you’ll see DOM-manipulation and async-pattern scenarios and large-scale UI performance tradeoffs; Coinbase favors pixel-perfect implementations, robust form/state synchronization, and edge-case handling; Robinhood tests real-time UI consistency and performance at scale; Toma and other early-stage teams focus on rapid prototyping and full-stack integration. Prep by building expressive, testable components, mastering React patterns and TypeScript typings, profiling and accessibility checks, and rehearsing clear trade-off explanations for design decisions.
"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 Photo Album App
Design a web-based photo album application for the browser (a frontend-focused system design). The product has three main screens, each provided to yo...
Design State for a Three-Column Work Board
Question Design the frontend state and update logic for a work board with exactly three ordered columns. Each column supports adding and deleting work...
Build an Event-Driven Folder Browser
Question Build the state model and component architecture for an interactive folder browser. Opening a folder reveals its direct children. Users can c...
Build a React naval board
Build a simplified, single-player Battleship-style game board in React. There is no opponent, no turn-taking, and no networking — you are implementing...
Build a Web Calculator That Matches a Reference App
You are in a 45–60 minute phone screen (with screen sharing) for a Fullstack/Frontend role. The interviewer shares a link to a simple calculator web a...
Implement Resilient Autocomplete Data Fetching
Implement the data-fetching logic for an autocomplete input whose UI is already provided. The component requests suggestions for the current query and...
Approximate Pi from Random Points
You are given an array pts of points in the unit square. Each point is represented as an array of two numbers [x, y], where 0 <= x <= 1 and 0 <= y <= ...
Build an Interactive Filtered Tree View
Build an Interactive Filtered Tree View Build a frontend component that accepts an n-ary tree and a text filter. If a node's value contains the filter...
Design a Scalable Calendar Service
Design an online calendar service (think Google Calendar) that supports both individual and shared calendars. Users must be able to create, update, de...
Review Code for Memory Risks
This question evaluates competency in memory management, performance analysis, and code-review skills for frontend implementations that deduplicate ob...
Build a React Parking Lot Manager
This question evaluates frontend engineering skills in React, including functional components and hooks, client-side state management, UI design, algo...
Plan Testing and Deployment for a React Feature
Design the frontend architecture, testing strategy, and safe deployment plan for a React conversational panel that streams responses and survives navi...
Design the Frontend for an AI Chat Application
Design the Frontend for an AI Chat Application Design the frontend architecture for a conversational AI application. Cover streaming responses, conver...
Executive-Round Behavioral: Proactive Decision-Making in Career and Projects
This question evaluates a candidate's ability to communicate agency and ownership across career choices and past project work. It tests whether someon...
Build a Weekly Calendar
Implement an interactive weekly calendar UI. Requirements: - Display a one-week calendar with 7 days. - The calendar should be divided into 1-hour tim...
Build a Streaming Chat Input
Implement a minimal front-end chat interface, similar to a stripped-down AI assistant (think a bare-bones ChatGPT). The user types a prompt, submits i...
Design High-Throughput Messaging Infrastructure
This question evaluates understanding of high-throughput messaging infrastructure, including database optimization strategies, message queue architect...
Build a React dashboard with filters
This question evaluates frontend engineering skills in React, including component decomposition, controlled inputs and state management, semantic HTML...
Debug an Angular UI from User Reports
Debug an Angular UI from User Reports You receive an existing Angular frontend code sample and several concrete user-reported failures. Reproduce each...
Which CSS function supports opacity?
This question evaluates a candidate's understanding of CSS color functions and opacity handling, specifically familiarity with color channel values an...