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)

Database optimization interview questions focused on query performance, indexing, execution plans, joins, pagination, transactions, and practical strategies for improving database efficiency in real-world systems.

dboptimization

Database optimization

MongoDB Performance Tuning category focused on improving query speed, indexing efficiency, schema design, aggregation performance, and scaling strategies for real-world MongoDB applications.

mongodbtunning

MongoDB Performance Tuning

Embedded Development covers the design and programming of software that runs directly on hardware devices. This category includes microcontrollers, real-time systems, sensors, communication protocols, memory management, hardware interfaces, debugging, and performance optimization for resource-constrained environments.

embedded

Embedded development

Electronics Basics covers foundational electronics knowledge for embedded engineers, including circuit fundamentals, basic components, schematic reading, practical signal handling, and power and protection concepts.

electronics-basics

Electronics Basics

Master C and C++ for embedded systems, including memory management, pointers, bitwise operations, hardware register access, interrupt-safe code, real-time constraints, and efficient interaction with microcontrollers and peripherals.

c_plus_embedded

C/C++ for Embedded

Assesses practical knowledge of Docker fundamentals, including images, containers, Dockerfiles, volumes, networking, registries, Docker Compose, security, troubleshooting, and container lifecycle management. Covers the ability to containerize applications, configure reproducible environments, optimize builds, manage persistent data and service communication, diagnose common runtime issues, and apply reliable containerization practices in development and production.

docker

Docker

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

Arrays

Variable Naming Rules

Implicit Type Casting

nullish coalescing

async/await

Comparison Operators

Event Loop

Algorithms

Strict Mode

Object Prototype

ES2022

Patterns

Memory Lifecycle

Closures

setTimeout

Prototypal Inheritance

Destructuring assignment

Object

Built-in Objects

IIFEs

Local & Session storages

bind

Symbol

string

undefined

number

bigint

boolean

null

Arrow Functions

Classes

Type Conversion vs Coercion

Explicit Type Casting

spread

break / continue

HTML

HTML: Events

Unary Operators

Assignment Operators

Logical Operators

Lexical Scoping

Iterators and Generators

Garbage Collection

Code examples

Default Params

decorators

in a function

try/catch/finally

Built-in Functions

call

import()

Rest

Block

Function

const

Symbol.iterator

CORS

for...in loop

for...of loop

performance optimization

Regular expressions

Weak Map

Loops and Iterations

Hoisting

Weak Set

while

do...while

Recursion

Fetch

Symbol.dispose

DOM APIs

Global

Typed Arrays

JSON

Object.is

isLooselyEqual

SameValueZero

SameValue

if...else

Switch

Error Objects

Arithmetic Operators

Bitwise Operators

BigInt Operators

String Operators

Conditional Operators

Comma Operators

arguments object

Function Borrowing

in a method

in arrow functions

in event handlers

Express test JavaScript: Junior level

apply

Callback Hell

setInterval

XMLHTTPRequest

CommonJS

Debugging Issues

Debugging Memory Leaks

Debugging Performance

Express test JavaScript: Middle level

Memory Management

Express test JavaScript: Senior level

Javascript (3)

Express test JavaScript: Junior level

Express test JavaScript: Middle level

Express test JavaScript: Senior level