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Interview prep hub
System design, Java, Python & frontend — pick a surface
This index lists every topic hub and SEO module we publish, but they are not all "the same as Java prep": system design and architecture hubs are language-agnostic; Python and frontend have their own roadmaps and domains. Use the cards below to enter the right track first, then drill modules.
4504+questions
210modules
17topic hubs
Start from a track
Independent prep surfaces
System design and architecture are language-agnostic hubs. Java and Python use roadmaps and the domain browser. Frontend (React, JS, TS) lives on the fullstack track. Use any entry point — they are not the same as "Java prep with extras."
System design & architecture
Scalability, trade-offs, LLD, distributed systems, and microservices — interview-ready hubs that stand alone from any language track.
Java backend
Spring, JVM, data layer, DevOps, cloud, and security — the full curriculum and topic hubs for Java backend interviews.
Python
Backend, fullstack, ML, and data tracks with the same structured Q&A format — pick your path from the domain browser.
Frontend & fullstack
JavaScript, TypeScript, React, Angular, and web foundations — lives on the fullstack track with its own module tree.
Language-agnostic
System design & architecture topic hubs
These hubs are framed for interview rounds that are not tied to a single language. Open any card — content may use examples in several stacks, but the trade-offs are universal.
System Design Interview Prep
Fundamentals, building blocks, and real case studies
37questions2modules
Low-Level Design (LLD) Interview Prep
Object-oriented design + machine coding rounds
25questions2modules
Software Architecture & Design Patterns Interview Prep
SOLID, clean architecture, DDD, and design patterns
49questions2modules
Microservices & APIs Interview Prep
REST, GraphQL, gRPC, Spring Cloud, Kafka, RabbitMQ, sagas
145questions6modules
Distributed Systems Interview Prep
Scale, consistency, messaging, sagas, consensus
95questions3modules
Java & platform stack
Java backend & ecosystem topic hubs
Spring, JVM, data, security, DevOps, cloud, SRE, and more — the pillars that sit under a typical Java backend hiring loop.
Java Language & Core Interview Prep
Core Java, Collections, Streams, Concurrency, JVM internals
291questions6modules
Spring Ecosystem Interview Prep
Spring Core, Boot, Data JPA, Security, WebFlux & Batch
159questions6modules
Databases & Caching Interview Prep
SQL, MongoDB, Redis, and caching patterns
100questions4modules
DevOps Interview Prep
Git, Maven/Gradle, Jenkins, CI/CD, Terraform, Docker & Kubernetes
108questions7modules
Java Testing Interview Prep
JUnit 5, Mockito, Spring Boot tests, Testcontainers, contract testing
30questions1modules
Cloud Interview Prep (AWS, GCP, Azure)
AWS, GCP, Azure & cloud-native architecture patterns
56questions4modules
SRE & Production Engineering Interview Prep
Observability, incident response, troubleshooting, on-call, chaos engineering
50questions2modules
Behavioral & Engineering Excellence Interview Prep
STAR method, leadership, code review, mentoring, technical decisions
22questions2modules
Application Security Interview Prep
OWASP, authentication, authorization, OAuth2 & JWT
37questions2modules
Concurrency & Multithreading Interview Prep
Threads, memory model, locks, executors, GC, JVM internals
85questions2modules
Docker & Kubernetes Interview Prep
Images, networking, Compose, pods, services, operators
44questions2modules
Hibernate, JPA & Database Interview Prep
JPA, Hibernate, transactions, N+1, SQL tuning, indexes
66questions2modules
Frontend & fullstack modules (JavaScript, TypeScript, React…)
These SEO modules live on the Java fullstack intermediate roadmap — grouped by curriculum pillar below so they stay separate from the Java backend list.
Java backend curriculum — every SEO module
Grouped by pillar from the backend indexJava Language & Core
18- Core Java & OOP Interview Questions55 Q&A
- Java OOP & SOLID Interview QuestionsAlso covers: object oriented programming java, solid principles java52 Q&A
- Java Collections & Algorithms Interview QuestionsAlso covers: java data structures53 Q&A
- Java Streams, Lambdas & Modern Java Interview QuestionsAlso covers: java 8, java 17, java 21, java lambda46 Q&A
- Java Concurrency & Multithreading Interview QuestionsAlso covers: java multithreading, java thread52 Q&A
- JVM Internals & Performance Interview QuestionsAlso covers: java jvm, java garbage collection33 Q&A
- Java Syntax & Language Fundamentals Interview QuestionsAlso covers: java syntax, java programming basics30 Q&A
- Java OOP Fundamentals Interview QuestionsAlso covers: java oop interview questions for beginners, object oriented programming java interview questions freshers30 Q&A
- Java Strings & Wrapper Classes Interview QuestionsAlso covers: string handling java, java string programs27 Q&A
- Java Collections Framework Interview QuestionsAlso covers: collections framework java, arraylist hashmap interview questions java48 Q&A
- Java Exception Handling Interview QuestionsAlso covers: java exception handling interview questions beginners, try catch finally java48 Q&A
- Java Multithreading Basics Interview QuestionsAlso covers: java thread interview questions beginners, concurrency java interview questions freshers44 Q&A
- Java 8 Features for Freshers Interview QuestionsAlso covers: lambda expression java, java streams interview questions beginners46 Q&A
- Java I/O & File Handling Basics Interview QuestionsAlso covers: java io interview questions beginners, java file io38 Q&A
- JVM Internals & Memory Management Interview QuestionsAlso covers: jvm memory, garbage collection interview questions java23 Q&A
- Core Java & OOP Fundamentals Interview QuestionsAlso covers: java basics, java fresher82 Q&A
- Java Collections Framework Interview Questions64 Q&A
- Java Threading Basics Interview Questions6 Q&A
Spring Ecosystem
9- Spring Core & IoC Interview QuestionsAlso covers: spring ioc, spring dependency injection27 Q&A
- Spring Boot Interview Questions35 Q&A
- Spring Data, JPA & Hibernate Interview QuestionsAlso covers: spring data jpa, jpa32 Q&A
- Spring Security & Identity Interview QuestionsAlso covers: oauth2, jwt26 Q&A
- Spring WebFlux & Reactive Programming Interview QuestionsAlso covers: reactive programming, project reactor19 Q&A
- Spring Batch & Scheduling Interview QuestionsAlso covers: spring scheduling20 Q&A
- Spring Core & Spring Boot Basics Interview QuestionsAlso covers: spring core interview questions freshers, spring di ioc interview questions freshers77 Q&A
- Spring Data JPA & Hibernate Basics Interview QuestionsAlso covers: hibernate interview questions freshers, jpa interview questions freshers65 Q&A
- Spring Security & Authentication Basics Interview QuestionsAlso covers: jwt spring boot interview questions freshers56 Q&A
Data & Persistence
11- SQL & Relational Databases Interview QuestionsAlso covers: database34 Q&A
- PostgreSQL Interview QuestionsAlso covers: postgres, postgresql spring boot12 Q&A
- NoSQL & MongoDB Interview QuestionsAlso covers: nosql, elasticsearch38 Q&A
- Redis & Caching Interview QuestionsAlso covers: caching, spring cache16 Q&A
- SQL Fundamentals Interview QuestionsAlso covers: basic sql, sql query interview questions for freshers57 Q&A
- JDBC Fundamentals Interview QuestionsAlso covers: java database connectivity, jdbc basics51 Q&A
- Database Design Basics Interview QuestionsAlso covers: normalization, database concepts interview questions freshers50 Q&A
- database/sql & sqlx Interview QuestionsAlso covers: golang sqlx, go sql driver0 Q&A
- GORM & Ent Interview QuestionsAlso covers: golang orm, ent orm golang0 Q&A
- PostgreSQL with pgx Interview QuestionsAlso covers: golang postgresql, go postgres0 Q&A
- Redis with Go Interview QuestionsAlso covers: go redis, redis go client0 Q&A
APIs, Microservices & Messaging
7- REST API & Spring MVC Interview QuestionsAlso covers: spring mvc44 Q&A
- GraphQL with Spring Interview QuestionsAlso covers: graphql spring, spring graphql12 Q&A
- gRPC for Java Services Interview QuestionsAlso covers: grpc java, protobuf8 Q&A
- Microservices Architecture Interview QuestionsAlso covers: spring cloud, service mesh33 Q&A
- Messaging & Event-Driven Architecture Interview QuestionsAlso covers: event driven architecture, event sourcing38 Q&A
- RabbitMQ & AMQP Interview QuestionsAlso covers: amqp, spring amqp10 Q&A
- AI & LLM Integration for Java Interview QuestionsAlso covers: llm integration java interview, rag java25 Q&A
Architecture & Design
6- Design Patterns & SOLID Interview QuestionsAlso covers: solid principles, java design patterns18 Q&A
- Architecture Patterns & Principles Interview QuestionsAlso covers: clean architecture, domain driven design, ddd31 Q&A
- Design Patterns in Go Interview QuestionsAlso covers: go design patterns, golang solid principles0 Q&A
- Clean Architecture & Hexagonal in Go Interview QuestionsAlso covers: golang hexagonal architecture, golang ddd0 Q&A
- Design Patterns in Ruby Interview QuestionsAlso covers: rails service objects, ruby solid0 Q&A
- Clean Architecture in Ruby Interview QuestionsAlso covers: rails hexagonal architecture0 Q&A
System Design
5- System Design Fundamentals Interview Questions24 Q&A
- System Design Case Studies Interview QuestionsAlso covers: system design case studies13 Q&A
- Low-Level Design (LLD) Interview QuestionsAlso covers: lld, object oriented design, machine coding round questions7 Q&A
- System Design Fundamentals Interview QuestionsAlso covers: go system design, system design golang backend0 Q&A
- Microservices with Go Interview QuestionsAlso covers: go microservices design, golang service mesh0 Q&A
Security
4- Application Security & OWASP Interview QuestionsAlso covers: owasp, web security11 Q&A
- Application Security & OWASP in Go Interview QuestionsAlso covers: go owasp, golang jwt security, golang authentication0 Q&A
- Rails Security Interview QuestionsAlso covers: rails owasp0 Q&A
- Auth, Secrets & Scanning Interview QuestionsAlso covers: brakeman bundler audit0 Q&A
Testing & Quality
3- Java Testing Interview QuestionsAlso covers: junit, mockito, advanced testing, tdd, testcontainers, contract testing30 Q&A
- Testing in Go Interview QuestionsAlso covers: go unit testing, golang testify, go table driven tests0 Q&A
- Mocking & Integration Testing Interview QuestionsAlso covers: golang gomock, golang integration testing, testcontainers go0 Q&A
DevOps
7- Git Interview QuestionsAlso covers: git commands11 Q&A
- Maven & Gradle (Java Build Tools) Interview QuestionsAlso covers: maven, gradle, maven vs gradle17 Q&A
- CI/CD Pipelines Interview QuestionsAlso covers: github actions, devops19 Q&A
- Terraform & Infrastructure-as-Code Interview QuestionsAlso covers: infrastructure as code, iac10 Q&A
- Jenkins CI Interview QuestionsAlso covers: jenkins pipeline, jenkinsfile7 Q&A
- Docker & Containerization Interview QuestionsAlso covers: containerization19 Q&A
- Kubernetes & Orchestration Interview QuestionsAlso covers: k8s, helm25 Q&A
Cloud
4- AWS, Cloud & Cloud-Native Architecture Interview Questions23 Q&A
- Cloud-Native & Cloud Architecture Interview QuestionsAlso covers: 12 factor app, infrastructure as code design9 Q&A
- Google Cloud Platform (GCP) Interview QuestionsAlso covers: google cloud, google cloud platform11 Q&A
- Microsoft Azure Interview QuestionsAlso covers: microsoft azure, azure cloud13 Q&A
Production
2Interview Readiness
9- Behavioral, Leadership & Engineering Practices Interview QuestionsAlso covers: java developer behavioral8 Q&A
- Engineering Practices & Technical Leadership Interview QuestionsAlso covers: code review, technical leadership, software engineering best practices14 Q&A
- Fresher Behavioral & HR Questions Interview QuestionsAlso covers: behavioral interview questions java freshers, tell me about yourself java fresher64 Q&A
- Technical Interview Preparation Interview QuestionsAlso covers: java fresher interview tips, how to prepare for java interview freshers35 Q&A
- Behavioral Interview & Engineering Practices Interview QuestionsAlso covers: hr interview questions for software freshers, soft skills interview questions java fresher0 Q&A
- Behavioral & STAR for Go Engineers Interview QuestionsAlso covers: behavioral interview questions go developer, go engineer behavioral0 Q&A
- Engineering Practices & Technical Leadership Interview Questions0 Q&A
- Common Go Interview Scenarios Interview QuestionsAlso covers: go interview scenarios freshers, golang practical40 Q&A
- Problem Solving & Coding Patterns in Go Interview QuestionsAlso covers: golang problem solving interview, go algorithms coding40 Q&A
Spring & Frameworks
4- Spring Boot for Freshers Interview QuestionsAlso covers: spring boot interview questions beginners, spring boot basics53 Q&A
- Spring Core & Dependency Injection Interview QuestionsAlso covers: dependency injection java, spring ioc container45 Q&A
- Spring Data JPA Basics Interview QuestionsAlso covers: jpa hibernate interview questions freshers, spring data interview questions beginners49 Q&A
- Spring Security Basics Interview QuestionsAlso covers: spring security basics java35 Q&A
REST APIs & Web
2Design Principles & Patterns
3- SOLID & OOP Design Principles Interview QuestionsAlso covers: oop design principles, solid java interview questions beginners41 Q&A
- Design Patterns Introduction Interview QuestionsAlso covers: java design patterns interview questions beginners, creational design patterns55 Q&A
- Low-Level Design (LLD) Basics Interview QuestionsAlso covers: object oriented design interview questions freshers, class design interview questions java40 Q&A
DSA & Problem Solving
2- Data Structures & Algorithms for Interviews Interview QuestionsAlso covers: dsa interview questions java beginners, java algorithms interview questions freshers55 Q&A
- Interview Problem-Solving Patterns Interview QuestionsAlso covers: java programming interview questions freshers, problem solving java interview42 Q&A
Testing
6- JUnit 5 & Unit Testing Interview QuestionsAlso covers: java unit testing, junit5 interview questions beginners40 Q&A
- Mockito & Test Doubles Interview QuestionsAlso covers: mocking java, mockito basics57 Q&A
- Spring Boot Testing Interview QuestionsAlso covers: spring test, webmvctest mockmvc23 Q&A
- RSpec Advanced Interview QuestionsAlso covers: rspec rails, ruby rspec testing0 Q&A
- FactoryBot & Capybara Interview QuestionsAlso covers: factorybot, capybara rails0 Q&A
- Test Doubles & Contract Testing Interview QuestionsAlso covers: ruby mocking stubbing0 Q&A
DevTools & Build
2Cloud & Containers Basics
1Debugging & Best Practices
1Data Structures & Algorithms
6- Arrays & String Algorithms Interview QuestionsAlso covers: arrays interview questions java, string manipulation interview questions java64 Q&A
- Linked Lists, Stacks & Queues Interview QuestionsAlso covers: linked list interview questions freshers, stack queue interview questions java50 Q&A
- Trees & Binary Search Trees Interview QuestionsAlso covers: trees interview questions java, bst interview questions java47 Q&A
- Graphs — BFS, DFS & Common Problems Interview QuestionsAlso covers: bfs dfs interview questions java12 Q&A
- Sorting, Searching, Recursion & Intro to DP Interview QuestionsAlso covers: sorting algorithms java interview, binary search interview questions java, dynamic programming fresher interview0 Q&A
- Data Structures & Algorithms in Go Interview QuestionsAlso covers: golang algorithms, go coding, golang leetcode patterns40 Q&A
Frontend Foundations
2React & Frontend Frameworks
2Fullstack Integration
2Design & Architecture Basics
2DevOps & Developer Tools
3- Git & Version Control Workflow Interview QuestionsAlso covers: git commands, version control44 Q&A
- Maven, Build Tools & Docker Basics Interview QuestionsAlso covers: maven interview questions freshers, docker basics interview questions freshers46 Q&A
- Testing Fundamentals — JUnit, Mockito & Frontend Testing Interview QuestionsAlso covers: unit testing java interview questions freshers, jest react testing interview questions freshers27 Q&A
Go Language & Core
5- Core Go & Types Interview QuestionsAlso covers: core golang, golang fundamentals, golang basics0 Q&A
- Interfaces, Embedding & Composition Interview QuestionsAlso covers: golang embedding, golang composition, golang duck typing0 Q&A
- Generics in Go Interview QuestionsAlso covers: go type parameters, golang 1 18 generics0 Q&A
- Error Handling in Go Interview QuestionsAlso covers: golang errors package, go custom error types0 Q&A
- Go Runtime, GC & Memory Interview QuestionsAlso covers: golang garbage collector, golang escape analysis, golang pprof0 Q&A
Concurrency & Async
4- Goroutines & Channels Interview QuestionsAlso covers: golang channels, golang concurrency, go goroutines channels0 Q&A
- select, Context & Cancellation Interview QuestionsAlso covers: golang select statement, golang context cancellation, go context package0 Q&A
- sync Package (Mutex, WaitGroup, Once, Pool) Interview QuestionsAlso covers: golang mutex, golang waitgroup, golang sync once0 Q&A
- Advanced Concurrency Patterns Interview QuestionsAlso covers: golang worker pool, golang errgroup, golang pipeline pattern0 Q&A
Web Frameworks
4- net/http Standard Library Interview QuestionsAlso covers: go http server, golang http handler0 Q&A
- Gin Web Framework Interview QuestionsAlso covers: gin gonic, golang gin framework0 Q&A
- Echo & Chi Interview QuestionsAlso covers: echo framework golang, chi router golang0 Q&A
- Fiber Interview QuestionsAlso covers: gofiber0 Q&A
APIs & Messaging
4- REST API Design with Go Interview QuestionsAlso covers: go rest api design, golang api versioning0 Q&A
- gRPC with Go Interview QuestionsAlso covers: go grpc server, protobuf golang0 Q&A
- Kafka & NATS with Go Interview QuestionsAlso covers: golang kafka producer consumer, nats golang0 Q&A
- GraphQL with Go (gqlgen) Interview QuestionsAlso covers: gqlgen, golang graphql server0 Q&A
DevOps & Build
3- Docker for Go Applications Interview QuestionsAlso covers: golang dockerfile, go multi stage build0 Q&A
- CI/CD for Go Projects Interview QuestionsAlso covers: github actions golang, go deployment pipeline0 Q&A
- Go Modules & Toolchain Interview QuestionsAlso covers: go mod, golang dependency management, go workspace0 Q&A
Cloud & Production
3- AWS with Go (aws-sdk-go-v2) Interview QuestionsAlso covers: aws sdk go v2, golang lambda, golang s30 Q&A
- Observability & Monitoring for Go Interview QuestionsAlso covers: golang opentelemetry, golang prometheus, golang structured logging0 Q&A
- Production Operations & SRE for Go Interview QuestionsAlso covers: golang production, go performance tuning0 Q&A
Go Language Basics
4- Go Syntax & Language Fundamentals Interview QuestionsAlso covers: basic golang, golang syntax, golang beginners40 Q&A
- Functions, Closures & Variadic Interview QuestionsAlso covers: golang closures, go variadic functions40 Q&A
- Structs, Methods & Interfaces Basics Interview QuestionsAlso covers: golang interfaces interview questions basics, golang methods, golang oop interview questions beginners40 Q&A
- Strings, Runes & Type Conversions Interview QuestionsAlso covers: golang string manipulation, go rune byte40 Q&A
Slices, Maps & Collections
1Error Handling
1Concurrency Basics
2I/O & Standard Library
2Testing Basics
2Build & Dependencies
1Web Basics
2DevOps Basics
1Cloud Fundamentals
1Ruby Language & Core
6- Ruby Language Core Interview QuestionsAlso covers: ruby interview questions for experienced, ruby programming0 Q&A
- Ruby OOP Advanced Interview QuestionsAlso covers: ruby object oriented0 Q&A
- Blocks, Procs & Lambdas Interview QuestionsAlso covers: ruby blocks, ruby lambda proc0 Q&A
- Modules & Mixins Interview QuestionsAlso covers: ruby include extend prepend0 Q&A
- Metaprogramming Interview QuestionsAlso covers: ruby method missing, ruby define method0 Q&A
- Ruby Concurrency Interview QuestionsAlso covers: ruby threading, ruby ractor fiber0 Q&A
Rails Framework
6- Rails MVC Core Interview QuestionsAlso covers: ruby on rails interview questions experienced, rails developer0 Q&A
- Action Controller Interview QuestionsAlso covers: rails action controller0 Q&A
- Rails Routing Interview Questions0 Q&A
- Action View & Helpers Interview Questions0 Q&A
- Active Support & Railtie Interview Questions0 Q&A
- Hotwire, Turbo & Stimulus Interview QuestionsAlso covers: turbo rails, stimulus0 Q&A
Data & Active Record
5- Active Record Core Interview QuestionsAlso covers: activerecord, rails orm0 Q&A
- Active Record Associations Interview QuestionsAlso covers: active record associations0 Q&A
- Active Record Query Interface Interview QuestionsAlso covers: active record query, rails eager loading0 Q&A
- Active Record Migrations Interview Questions0 Q&A
- Sequel & Raw SQL Interview Questions0 Q&A
APIs & Serialization
3Background Jobs & Async
3DevOps & Cloud
1Production & Observability
1Ruby Language Basics
7- Ruby Language Basics Interview QuestionsAlso covers: ruby basic, ruby beginner5 Q&A
- Ruby OOP Basics Interview QuestionsAlso covers: ruby class object5 Q&A
- Blocks & Iterators Interview QuestionsAlso covers: ruby each map select4 Q&A
- Error Handling Basics Interview QuestionsAlso covers: ruby rescue ensure5 Q&A
- Ruby Modules Basics Interview QuestionsAlso covers: ruby mixins interview questions beginners3 Q&A
- Ruby Debugging & Developer Tools Interview Questions5 Q&A
- Ruby File I/O & Serialization Interview QuestionsAlso covers: ruby file handling2 Q&A
Rails Basics
2Active Record Basics
1Rails APIs & Authentication
3- Rails API Basics Interview QuestionsAlso covers: ruby rest api interview questions beginners, rails api basics5 Q&A
- Rails Authentication Basics Interview QuestionsAlso covers: devise interview questions beginners, rails session token auth basics3 Q&A
- Ruby & Rails Security Basics Interview QuestionsAlso covers: ruby security interview questions beginners3 Q&A