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Developer Interview Questions 2026

The complete interview prep hub for software developers. Java, Spring Boot, AWS, Kubernetes, React, Python, Kafka, Docker, DevOps and Microservices — with detailed answers and real interview examples.

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All Topics Java & Spring Cloud & AWS DevOps & K8s Frontend Data & Messaging System Design
Java & Spring
Java
Java Interview Questions — 5+ Years Experience
50 Q&As · Concurrency, JVM, Streams, Design Patterns
  • What is the difference between HashMap and ConcurrentHashMap?
  • Explain the Java memory model and happens-before relationship.
  • What are virtual threads in Java 21 and how do they differ from platform threads?
Senior View all 50 questions
Spring Boot
Spring Boot Interview Questions 2026 (Top 60)
60 Q&As · Auto-config, Security, JPA, Actuator, Testing
  • How does Spring Boot auto-configuration work internally?
  • What is the difference between @Component, @Service and @Repository?
  • How do you implement JWT authentication in Spring Boot?
Mid–Senior View all 60 questions
Microservices
Microservices Interview Questions (Top 50)
50 Q&As · Design patterns, Service mesh, Resilience
  • What is the difference between an API Gateway and a Service Mesh?
  • How do you handle distributed transactions across microservices?
  • Explain the Saga pattern and when to use it.
Senior View all 50 questions
Cloud & AWS
AWS
AWS Interview Questions 2026 (Top 60)
60 Q&As · EC2, S3, Lambda, VPC, IAM, EKS, RDS
  • What is the difference between Security Groups and NACLs?
  • How does AWS Lambda handle cold starts and how do you mitigate them?
  • Explain the difference between SQS standard and FIFO queues.
Mid–Senior View all 60 questions
DevOps & Kubernetes
Kubernetes
Kubernetes Interview Questions 2026 (Top 50)
50 Q&As · Pods, Services, RBAC, Ingress, HPA
  • What is the difference between a Deployment and a StatefulSet?
  • How does Kubernetes handle rolling updates and rollbacks?
  • Explain how a Pod gets scheduled onto a Node.
Mid–Senior View all 50 questions
DevOps
DevOps Interview Questions 2026 (Top 50)
50 Q&As · CI/CD, Docker, GitOps, Monitoring, IaC
  • What is the difference between continuous delivery and continuous deployment?
  • How do you implement blue-green deployment in a Kubernetes environment?
  • Explain GitOps and how it differs from traditional CI/CD.
Mid View all 50 questions
Docker
Docker Interview Questions 2026 (Top 50)
50 Q&As · Images, Containers, Networking, Compose
  • What is the difference between COPY and ADD in a Dockerfile?
  • How do Docker layers work and how does layer caching help build speed?
  • Explain the difference between bridge, host, and overlay networks.
Junior–Mid View all 50 questions
Frontend
React
React Interview Questions 2026 (Top 50)
50 Q&As · Hooks, State, Context, Performance, SSR
  • What is the difference between useMemo and useCallback?
  • How does React's reconciliation algorithm (Fiber) work?
  • What are React Server Components and how do they differ from Client Components?
Mid–Senior View all 50 questions
Data & Messaging
Kafka
Kafka Interview Questions 2026 (Top 50)
50 Q&As · Topics, Partitions, Consumers, Streams
  • What is the role of a consumer group in Kafka?
  • How does Kafka guarantee message ordering?
  • What is the difference between at-least-once and exactly-once semantics?
Mid–Senior View all 50 questions
Python
Python Interview Questions 2026 (Top 50)
50 Q&As · OOP, Data Structures, Async, Libraries
  • What is the GIL and how does it affect multithreading in Python?
  • Explain the difference between generators and iterators.
  • What are Python decorators and how do you implement one?
Mid View all 50 questions
System Design
System Design
System Design Interview Guide 2026

Master the most asked design questions at senior-level interviews. URL shorteners, chat systems, rate limiters, notification systems and more — all with step-by-step breakdowns and architecture diagrams.

URL Shortener Chat System Rate Limiter CAP Theorem 15 topics
Go to System Design Hub

Senior Interview Path

  • Java (Senior) + Spring Boot
  • Microservices + Kafka
  • AWS or Kubernetes
  • System Design (all 15 topics)

These 4 areas cover ~90% of senior engineering interviews at Indian product companies and MNCs.

By Experience Level

0–2 yrs

Junior Developer

Focus on language fundamentals, OOP concepts, basic data structures, Docker basics and how REST APIs work.

Start with Java →
Then Docker →
3–5 yrs

Mid-Level Developer

Add Spring Boot, AWS fundamentals, Kubernetes basics, microservices patterns and testing practices.

Spring Boot →
Then AWS →
6+ yrs

Senior / Lead

Deep Kubernetes, distributed systems, system design, Kafka event-driven patterns and architectural trade-offs.

Kubernetes →
System Design →

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