javascript

Javascript

react

ReactJS

node

NodeJS

typescript

TypeScript

CSS covers styling and layout in frontend development—how a website looks and adapts. It includes selectors and the cascade, box model, positioning and Flexbox/Grid, typography and colors, responsive design (media/container queries), animations/transitions, and building reusable UI themes and components.

Develop and maintain iOS mobile applications using UIKit and SwiftUI · Design and implement new features, optimize and refactor existing code

swift

Swift (IOS Developer)

python

Python

soft-skills

Soft Skills

Frontend System Design is a hard skill—it’s about technical architecture.
But it’s evaluated alongside soft skills (communication & trade-off reasoning).
App architecture & state strategy (SPA/MPA, SSR/ISR, microfrontends)
Performance budgets, caching, CDN/edge, code-splitting
API contracts, schema/versioning, error handling & resiliency
Design system architecture, accessibility, i18n
Testing strategy, observability, security, and deployments

frontend-system-design

Frontend System Design

SQL Databases questions evaluate a candidate’s understanding of relational data, querying, joins, indexing, normalization, transactions, and performance optimization. These questions help assess how well a developer can design database structures, write efficient queries, and work with real-world data reliably.

sqldatabase

SQL databases

Category focused on command-line skills, shell scripting, and everyday terminal usage for developers. It covers working with files, processes, permissions, pipes, redirection, and common Unix-like system commands used in real development and DevOps workflows.

linux-unix-bash-shell-cli

Linux / Unix / Bash / Shell / CLI

Cybersecurity for Full-Stack developers, focused on interview preparation. Covers secure authentication and authorization, common web vulnerabilities, API and session security, frontend and backend attack vectors, data protection, and practical security decisions in modern full-stack applications.

cybersecurity

Cybersecurity for Full-Stack Developers (Node.js/React Stack)

Check your abilities and showcase the expertise in JavaScript coding with our platform, join us to  take the JavaScript knowledge to the next level!

Introduction to JavaScript

Equality Comparisons

Type Casting

nullish coalescing

Modules in JavaScript

Promises

Event Loop

Algorithms

Object Prototype

Object

ES2022

Patterns

Arrays

Memory Management

Closures

setTimeout

Destructuring assignment

IIFEs

Local & Session storages

Explicit Binding

Data Types

Functions

Classes

Variable Declarations

spread

All about Variables

Loops and Iterations

HTML

HTML: Events

Type Conversion vs Coercion

CORS

Symbol

Expressions & Operators

decorators

theory

Keyed Collections

Iterators and Generators

Code examples

string

import()

Rest

Symbol.iterator

performance optimization

Regular expressions

Hoisting

Memory Lifecycle

Weak Set

while

do...while

try/catch/finally

Recursion

Fetch

Garbage Collection

Express test JavaScript: Junior level

Express test JavaScript: Middle level

Express test JavaScript: Senior level

Quick check JS knowledge

Javascript (4)

Express test JavaScript: Junior level

Express test JavaScript: Middle level

Express test JavaScript: Senior level

Quick check JS knowledge