Catalog

Practice real frameworks

Pick a framework in the explorer, then work through its challenges — the same skills real engineering teams hire for.

AngularFrontend

Node 24Angular 21Typescript 5.8

component-based architecturedependency injectionreactive programming+7

React 19Node 24Typescript 5.8

component lifecyclehooksJSX+7

TypeScriptFrontend

Node 24Typescript 7

static typingtype inferenceinterfaces+7

Agentic Full-Stack Web DevelopmentAI Engineer

MERNNode.js 24 + .NET 10Node.js 24 + Java 25+1

streaming responsesserver-sent eventsbackground jobs+5

AI AgentsAI Engineer

tool callingagent loopsfunction schemas+5

Memory & ContextAI Engineer

context windowsconversation summarisationdurable user memory+4

Prompting & EvaluationAI Engineer

prompt structurefew-shot examplesstructured output+4

chunking strategiesembeddingsvector search+5

object-oriented programmingmemory managementlanguage interoperability+7

Python 3.13Django 5.2

model-view-template architectureORM usagetemplate rendering+7

FastAPI 0.139Python 3.13pydantic 2.13

asynchronous programmingautomatic OpenAPI generationdata validation with Pydantic+3

routingrequest handlingtemplating+6

Larave 13.0PHP 8.4

MVC architectureEloquent ORMBlade templating+5

MERN StackBackend

Node 24React 19Express 5

CRUD operationsRESTful APIsJSON data handling+5

Node 24TypeScript 5.4Express 4.21

event-driven architecturenon-blocking I/Onpm package management+5

Spring BootBackend

Java 25Spring Boot 4.1Maven 3.8+1

auto-configurationembedded serversSpring Data JPA+6

Amazon Web ServicesDevops

cloud formationelastic compute cloudsimple storage service+6

Dockerfilesmulti-stage buildslayer caching+5

Linux CLIGit 2.47.3

branchingmergingrebasing+7

KubernetesDevops

container orchestrationservice discoveryload balancing+6

kernel configurationshell scriptingprocess management+6

TerraformDevops

Linux CLITerraform 1.15

infrastructure as codestate managementexecution plans+7

Node 24React 19Mongoose 9.91+1

CRUD operations with MongoDBRESTful API design with ExpressReact component lifecycle+7

MERN (Agentic)Fullstack

Node 24React 19Mongoose 9.91+1

streaming to the clientagent orchestrationtool endpoints+4

Next.jsFullstack

Node 24Next.js 16Typescript 5

server-side renderingstatic site generationfile-based routing+7

CypressQuality Assurance

selectorsassertionsnetwork stubbing+5

PlaywrightQuality Assurance

Node 24Playwright 1.61

cross-browser testingheadless browser automationparallel test execution+6

SeleniumQuality Assurance

Selenium Java 4.35Java 25

browser automationcross-browser testingweb element interaction+5

Android JavaMobile

Android Java 25Java 25

activity lifecycleintent handlingfragment management+7

Android KotlinMobile

Android java 25Kotlin 2.4

null safetycoroutinesextension functions+3

React NativeMobile

React 19Expo 54React Native 0.81.5+1

native moduleshot reloadingcross-platform development+5

PostgreSQLDatabases

schema designjoinsindexes+5

data persistencepub/sub messagingreplication+7

KafkaData Engineering

Java 25Node.js 24Python 3.13

topics and partitionsproducersconsumer groups+5

SparkData Engineering

DataFramestransformations and actionslazy evaluation+5

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