Interviews Analyzed
3,247
What full stack engineers are actually asked in interviews.
Based on 3,247 real interview reports from candidates who landed offers at top tech companies.
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.
Full stack roles vary significantly by company culture and technical stack. Here's how interview focus differs across company types.
FAANG
HighMeta · Google · Amazon · Netflix · Apple
100%
- Algorithms 45%
- System design 35%
- Behavioral 20%
Heavy emphasis on algorithms and large-scale system design. Expect complex coding rounds and distributed systems questions.
AlgorithmsScale
FINTECH
Medium-HighStripe · Square · Coinbase · Robinhood · Plaid
100%
- Algorithms 30%
- System design 40%
- Behavioral 30%
Strong focus on API design, payment systems, and financial data handling. Security and reliability are key themes.
APIsSecurity
EARLY-STAGE · SERIES A-B
MediumVarious startups · funded companies
100%
- Algorithms 25%
- System design 25%
- Behavioral 25%
- Domain / fit 25%
Balanced evaluation with emphasis on shipping features quickly. Product sense and adaptability matter as much as technical skills.
ProductVelocity
02 — Topics
Most frequently tested topics
68% of interviews containing topic
01
JavaScript & DOM
85%closures, promises, event handling, async/await, DOM manipulation
Core JavaScript concepts and browser APIs for frontend development
02
React & State Management
78%hooks, component lifecycle, Redux, context, virtual DOM
Modern React patterns and state management approaches
03
API Design & HTTP
72%REST, GraphQL, authentication, CORS, status codes
Backend API design principles and web protocols
04
Database Design
65%SQL, NoSQL, indexing, relationships, transactions
Data modeling and database optimization for web applications
05
System Architecture
58%microservices, caching, load balancing, CDN, scalability
High-level system design for scalable web applications
06
Testing & DevOps
45%unit testing, integration testing, CI/CD, Docker, deployment
Quality assurance and deployment practices for full stack applications
03 — Interview loop
Typical full stack engineer interview process
System design rounds are often the bottleneck for full stack candidates, as they require demonstrating both frontend and backend architecture knowledge.
Pass-rate funnel
Phone Screen · 78%
Technical Screen · 65%
System Design · 42%
Coding Deep Dive · 58%
Frontend Focus · 55%
Behavioral · 72%
Offer rate compounded ≈ 1.3%
01
Phone Screen
45 min · pass 78%
Basic coding problem, often JavaScript-focused with DOM manipulation
02
Technical Screen
60 min · pass 65%
Live coding session covering both frontend and backend concepts
03
System Design
BOTTLENECK60 min · pass 42%
Design a complete web application with frontend, backend, and database
04
Coding Deep Dive
60 min · pass 58%
Complex algorithmic problem with optimization requirements
05
Frontend Focus
60 min · pass 55%
React component design, state management, and performance optimization
06
Behavioral
45 min · pass 72%
Leadership, collaboration, and technical decision-making scenarios
04 — Question bank
Real questions you'll encounter.
Curated from actual full stack engineer interviews at top companies.
JAVASCRIPT FUNDAMENTALS
Easy → Mediumthrottle function
- throttle function
- deep clone object
- flatten array
- event delegation
REACT COMPONENTS
MediumBuild autocomplete
- infinite scroll
- modal component
- form validation
- custom hooks
API DESIGN
MediumDesign REST endpoints
- rate limiting
- pagination
- authentication
- error handling
DATABASE QUERIES
Medium → HardOptimize slow query
- join optimization
- index design
- query planning
- data modeling
SYSTEM DESIGN
HardDesign Twitter feed
- chat application
- URL shortener
- image upload service
- notification system
PERFORMANCE
Medium → HardReduce bundle size
- lazy loading
- code splitting
- caching strategy
- CDN optimization
892 questions in the bank
Open the full bank →05 — Prep roadmap
12-week preparation roadmap
Structured approach to master both frontend and backend skills for full stack interviews.
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
Master core JavaScript concepts, ES6+ features, and React fundamentals. Build solid understanding of closures, promises, and component lifecycle.
JavaScriptReactFundamentals
Weeks 4-7
7 hrs/wk
Backend & Database Skills
Learn Node.js, Express, and database design. Practice API development, authentication, and data modeling patterns.
Node.jsAPIsDatabases
Weeks 8-10
8 hrs/wk
System Design & Architecture
Study distributed systems, caching, and scalability. Practice designing complete web applications from frontend to database.
System DesignArchitectureScale
Weeks 11-12
7 hrs/wk
Mock Interviews & Polish
Conduct full mock interviews covering coding, system design, and behavioral questions. Refine communication and problem-solving approach.
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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