Interviews Analyzed
3,200
What backend engineers are actually asked in interviews.
Based on 3,200+ real interview reports from backend engineers at top tech companies.
Average Prep Time
12weeks
foundations
deep
system
polish
Offers Landed
72%
Among candidates following the plan
Avg Salary Bump
+$42k
Pre-offer vs post-offer base + equity
We pull jobs from sources most job seekers never check
01 — Companies
What top companies emphasize.
Backend engineer interviews vary significantly by company type, with different emphasis on algorithms vs system design vs domain expertise.
FAANG
HighMeta · Amazon · Netflix · Google
100%
- Algorithms 45%
- System design 35%
- Behavioral 20%
Heavy emphasis on algorithmic problem-solving with complex system design scenarios.
Distributed SystemsScale
FINTECH
Medium-HighStripe · Square · Coinbase · Robinhood
100%
- Algorithms 30%
- System design 40%
- Behavioral 15%
- Domain / fit 15%
Focus on reliability, consistency, and financial domain knowledge.
ReliabilityCompliance
EARLY-STAGE · SERIES A-B
MediumVarious startups · scale-ups
100%
- Algorithms 25%
- System design 25%
- Behavioral 20%
- Domain / fit 30%
Balanced approach with strong emphasis on cultural fit and adaptability.
VersatilityGrowth Mindset
02 — Topics
Most frequently tested topics
67% of interviews containing topic
01
API Design & REST
82%REST, GraphQL, API versioning, rate limiting, authentication
Designing scalable APIs with proper HTTP semantics and error handling
02
Database Design
78%SQL optimization, indexing, ACID properties, normalization, sharding
Database schema design, query optimization, and scaling strategies
03
Caching Strategies
71%Redis, Memcached, cache invalidation, CDN, cache-aside
Implementing effective caching layers for performance optimization
04
Microservices Architecture
65%service discovery, load balancing, circuit breaker, saga pattern
Designing and implementing distributed microservice architectures
05
Message Queues
58%Kafka, RabbitMQ, pub-sub, event sourcing, dead letter queue
Asynchronous communication patterns and event-driven architectures
06
Concurrency & Threading
52%locks, deadlock, thread pools, async programming, race conditions
Managing concurrent operations and thread safety in backend systems
03 — Interview loop
Typical backend engineer interview process
System design often becomes the bottleneck, as it requires deep understanding of distributed systems and real-world trade-offs.
Pass-rate funnel
Phone Screen · 65%
Coding Round 1 · 58%
System Design · 42%
Coding Round 2 · 55%
Behavioral · 68%
Bar Raiser · 48%
Offer rate compounded ≈ 1.3%
01
Phone Screen
45 min · pass 65%
Basic coding problem and system design discussion
02
Coding Round 1
60 min · pass 58%
Medium-difficulty algorithm and data structure problems
03
System Design
BOTTLENECK60 min · pass 42%
Design a distributed backend system with scaling considerations
04
Coding Round 2
60 min · pass 55%
Backend-specific problems involving concurrency or API design
05
Behavioral
45 min · pass 68%
Leadership principles and past project discussions
06
Bar Raiser
60 min · pass 48%
Final technical and cultural assessment
04 — Question bank
Real questions you'll encounter.
Curated from actual backend engineer interviews at top companies.
ARRAYS & STRINGS
Easy → MediumMerge intervals
- two sum
- longest substring
- valid parentheses
- group anagrams
TREES & GRAPHS
Medium → HardBinary tree paths
- validate BST
- lowest common ancestor
- graph clone
- course schedule
DYNAMIC PROGRAMMING
Medium → HardCoin change
- house robber
- longest increasing subsequence
- edit distance
- word break
SYSTEM DESIGN
Medium → HardDesign chat system
- URL shortener
- rate limiter
- notification service
- distributed cache
CONCURRENCY
MediumProducer consumer
- thread-safe counter
- dining philosophers
- reader-writer lock
- barrier synchronization
DATABASE DESIGN
MediumSocial media schema
- e-commerce database
- messaging system tables
- analytics data model
- user permissions
850 questions in the bank
Open the full bank →05 — Prep roadmap
12-week preparation roadmap
A structured approach to backend engineer interview preparation, building from fundamentals to advanced distributed systems concepts.
Hours / week
Total: 78 hrs
W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
W11
W12
Weeks 1-3
5 hrs/wk
Coding Foundations
Master fundamental data structures and algorithms with focus on backend-relevant problems.
ArraysStringsHash TablesBasic Trees
Weeks 4-7
7 hrs/wk
Advanced Algorithms
Tackle complex algorithmic problems including dynamic programming, graphs, and concurrent programming patterns.
Dynamic ProgrammingGraphsConcurrencyAdvanced Trees
Weeks 8-10
8 hrs/wk
System Design Mastery
Deep dive into distributed systems, database design, and scalable backend architectures.
Distributed SystemsDatabase DesignMicroservicesCaching
Weeks 11-12
7 hrs/wk
Interview Polish
Practice mock interviews, refine communication skills, and review company-specific patterns.
Mock InterviewsBehavioral PrepCompany ResearchFinal Review
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
Don’t get beat to tomorrow’s openings
New roles go live every minute and the earliest applicants win. Get the freshest, verified listings delivered straight to your inbox before most job seekers ever see them.
👉 Get free daily job posts