Interviews Analyzed
3,247
What senior frontend engineers are actually asked in interviews.
Based on 3,247 real interview reports from senior frontend engineers at FAANG, unicorns, 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.
Interview focus varies significantly by company type and scale. Here's what matters most at each tier.
FAANG
Very HardMeta · Google · Apple · Netflix · Amazon
100%
- Algorithms 45%
- System design 35%
- Behavioral 20%
Heavy emphasis on algorithms and system design with React/framework internals knowledge.
React InternalsPerformance
FINTECH
HardStripe · Square · Coinbase · Robinhood · Plaid
100%
- Algorithms 30%
- System design 40%
- Behavioral 30%
Strong focus on system design, TypeScript, and building reliable financial interfaces.
TypeScriptReliability
EARLY-STAGE · SERIES A-B
Medium-HardNotion · Linear · Vercel · Figma · Framer
100%
- Algorithms 25%
- System design 25%
- Behavioral 25%
- Domain / fit 25%
Balanced approach with emphasis on product thinking and rapid feature development.
Product SenseFull-Stack
02 — Topics
Most frequently asked topics
67% of interviews containing topic
01
JavaScript Fundamentals
89%closures, prototypes, async/await, event loop, hoisting
Core JavaScript concepts that every senior frontend engineer must master
02
React & Component Design
82%hooks, lifecycle, state management, performance, patterns
React expertise and component architecture design principles
03
Frontend System Design
76%architecture, scalability, performance, caching, bundling
Designing large-scale frontend applications and infrastructure
04
Algorithms & Data Structures
71%arrays, trees, graphs, dynamic programming, sorting
Classic computer science problems with frontend application context
05
Web Performance
64%optimization, lazy loading, code splitting, metrics, debugging
Performance optimization techniques and measurement strategies
06
CSS & Styling
58%flexbox, grid, animations, responsive, preprocessors
Advanced CSS techniques and modern styling approaches
07
Testing & Quality
45%unit tests, integration, e2e, mocking, coverage
Testing strategies and quality assurance for frontend applications
03 — Interview loop
Typical interview process
System design rounds tend to be the biggest bottleneck for senior frontend candidates, with many strong coders struggling on architecture questions.
Pass-rate funnel
Phone Screen · 78%
Technical Coding · 65%
Frontend System Design · 42%
React Deep Dive · 58%
Behavioral · 72%
Final Round · 85%
Offer rate compounded ≈ 1.3%
01
Phone Screen
45 min · pass 78%
JavaScript fundamentals and basic coding problems
02
Technical Coding
60 min · pass 65%
Medium-level algorithms with frontend context
03
Frontend System Design
BOTTLENECK60 min · pass 42%
Design scalable frontend architecture and components
04
React Deep Dive
60 min · pass 58%
Framework internals and advanced patterns
05
Behavioral
45 min · pass 72%
Leadership, collaboration, and technical decision-making
06
Final Round
30 min · pass 85%
Culture fit and team match with hiring manager
04 — Question bank
Real questions you'll encounter.
Curated from actual senior frontend engineer interviews at top companies
JAVASCRIPT FUNDAMENTALS
Mediumthrottle function
- throttle function
- deep clone object
- event delegation
- promise chain
REACT & COMPONENTS
Medium → HardCustom hook design
- useEffect cleanup
- context optimization
- memo patterns
- ref forwarding
FRONTEND SYSTEM DESIGN
Hardinfinite scroll
- infinite scroll
- image gallery
- chat application
- dashboard layout
ALGORITHMS
MediumValid parentheses
- binary tree paths
- merge intervals
- sliding window
- two pointers
PERFORMANCE
Medium → HardBundle optimization
- lazy loading
- code splitting
- cache strategies
- memory leaks
CSS & STYLING
MediumResponsive layout
- flexbox centering
- grid system
- animation timing
- media queries
847 questions in the bank
Open the full bank →05 — Prep roadmap
12-week preparation roadmap
Structured path from JavaScript fundamentals to senior-level system design, optimized for working professionals.
Hours / week
Total: 78 hrs
W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
W11
W12
Weeks 1-3
5 hrs/wk
JavaScript & React Foundations
Solidify core JavaScript concepts and React fundamentals. Build muscle memory for common patterns and hooks.
JavaScriptReactFundamentals
Weeks 4-7
7 hrs/wk
Algorithm Practice & Problem Solving
Master medium-level algorithms with frontend context. Focus on data structures commonly used in UI development.
AlgorithmsData StructuresProblem Solving
Weeks 8-10
8 hrs/wk
System Design & Architecture
Learn to design scalable frontend systems. Practice component architecture, state management, and performance optimization.
System DesignArchitecturePerformance
Weeks 11-12
7 hrs/wk
Mock Interviews & Polish
Simulate real interview conditions. Refine communication skills and practice explaining technical decisions clearly.
Mock InterviewsCommunicationFinal 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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