Interviews Analyzed
2,800
What frontend engineers are actually asked in interviews.
Based on 2,800+ real interview reports from frontend engineers at FAANG, fintech, and high-growth startups.
Average Prep Time
12weeks
foundations
deep
system
polish
Offers Landed
72%
Among candidates following the plan
Avg Salary Bump
+$38k
Pre-offer vs post-offer base + equity
We pull jobs from sources most job seekers never check
01 — Companies
What top companies emphasize.
Frontend interview focus varies significantly by company type, from algorithm-heavy FAANG to product-focused startups.
FAANG
HighMeta · Google · Apple · Netflix · Amazon
100%
- Algorithms 45%
- System design 35%
- Behavioral 20%
Heavy emphasis on algorithms with JavaScript, plus frontend system design at senior levels.
LeetCodeReact Internals
Fintech
Medium-HighStripe · Square · Coinbase · Robinhood · Plaid
100%
- Algorithms 30%
- System design 40%
- Behavioral 30%
Balanced approach with strong focus on secure, accessible UI patterns and financial data visualization.
TypeScriptAccessibility
Early-stage Series A-B
MediumNotion · Linear · Figma · Vercel · Framer
100%
- Algorithms 20%
- System design 25%
- Behavioral 25%
- Domain / fit 30%
Product-focused interviews emphasizing user experience, design implementation, and rapid prototyping.
Product SenseDesign Systems
02 — Topics
Most frequently tested topics
68% of interviews containing topic
01
DOM Manipulation & Events
82%event delegation, virtual DOM, querySelector, addEventListener, bubbling
Core browser APIs and event handling patterns appear in most frontend interviews.
02
Async JavaScript
76%promises, async/await, callbacks, fetch, setTimeout
Asynchronous programming concepts are essential for modern web development roles.
03
React/Framework Patterns
71%hooks, lifecycle, state management, props, components
Framework-specific knowledge, especially React, is tested at most companies.
04
CSS & Styling
64%flexbox, grid, responsive, animations, specificity
CSS fundamentals and modern layout techniques remain important interview topics.
05
Performance Optimization
58%bundling, lazy loading, caching, code splitting, metrics
Web performance knowledge becomes critical for senior frontend positions.
06
Data Structures & Algorithms
52%arrays, objects, trees, graphs, sorting
Traditional CS fundamentals adapted for JavaScript and frontend contexts.
03 — Interview loop
The frontend interview process
Frontend system design often becomes the bottleneck, as candidates struggle to architect scalable client-side applications while balancing performance and user experience.
Pass-rate funnel
Phone Screen · 78%
Technical Assessment · 65%
Coding Interview · 52%
Frontend System Design · 38%
Behavioral Interview · 68%
Offer rate compounded ≈ 1.3%
01
Phone Screen
45 min · pass 78%
Basic JavaScript concepts and simple DOM manipulation problems.
02
Technical Assessment
90 min · pass 65%
Take-home project or live coding with React/framework of choice.
03
Coding Interview
60 min · pass 52%
Algorithm problems with JavaScript, often involving DOM or async patterns.
04
Frontend System Design
BOTTLENECK60 min · pass 38%
Design scalable frontend applications, component architecture, and performance considerations.
05
Behavioral Interview
45 min · pass 68%
Leadership scenarios, collaboration, and frontend-specific project discussions.
04 — Question bank
Real questions you'll encounter.
Curated from actual frontend engineering interviews at top tech companies.
DOM MANIPULATION
Easy → MediumEvent delegation
- click counter
- dynamic list
- form validation
- infinite scroll
ASYNC JAVASCRIPT
MediumPromise patterns
- parallel requests
- retry logic
- timeout handling
- race conditions
REACT COMPONENTS
MediumCustom hooks
- useLocalStorage
- useDebounce
- useFetch
- useIntersection
CSS LAYOUTS
Easy → MediumResponsive design
- flexbox centering
- grid layouts
- media queries
- mobile-first
PERFORMANCE
Medium → HardBundle optimization
- code splitting
- lazy loading
- tree shaking
- caching strategies
SYSTEM DESIGN
Hardsearch suggestions
- search suggestions
- debouncing
- caching
- accessibility
890 questions in the bank
Open the full bank →05 — Prep roadmap
12-week preparation roadmap
Structured path from JavaScript fundamentals to advanced frontend system design, based on successful candidate patterns.
Hours / week
Total: 78 hrs
W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
W11
W12
Weeks 1-3
5 hrs/wk
JavaScript & DOM Fundamentals
Master core JavaScript concepts, browser APIs, and basic DOM manipulation patterns essential for frontend interviews.
JavaScriptDOMEventsAsync
Weeks 4-7
7 hrs/wk
Framework Mastery & Algorithms
Deep dive into React patterns, state management, and algorithm problems with JavaScript-specific optimizations.
ReactHooksStateAlgorithms
Weeks 8-10
8 hrs/wk
System Design & Architecture
Learn to design scalable frontend applications, component architectures, and performance optimization strategies.
System DesignPerformanceArchitecture
Weeks 11-12
7 hrs/wk
Mock Interviews & Polish
Practice complete interview loops, refine communication skills, and prepare company-specific talking points.
Mock InterviewsBehavioralCompany Prep
06 — Tools & resources
Tools & resources that work.
Battle-tested by candidates who landed offers.
Mix of free + premium.
InterviewPal
Guided interview prep with mentorship and structured paths.
Best for: Structured prep
Visit InterviewPal
LeetCode
2,000+ coding problems. Premium unlocks company-tagged sets.
Best for: Algorithms & DS
Visit LeetCode
System Design Primer
Free comprehensive guide. The de-facto starting point.
Best for: SD fundamentals
Visit System Design Primer
Blind
Anonymous tech community. Real interview experiences and insights.
Best for: Real signal
Visit Blind
Levels.fyi
Salary and interview data, by company and level.
Best for: Company intel
Visit Levels.fyi
Pramp
Peer mock interviews. Live practice with real people.
Best for: Live practice
Visit PrampFrequently Asked Questions
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