English Courses

Career Certificate

Introduction to MongoDB for Data Analysts

1 rating

Learn to manage, query, and manipulate data in MongoDB, including schemas, relations, read operations, and update operations.

• CodeSignal
• 7 hours
• Self-Paced
• Free Certificate
• 4 courses

Career Certificate

AI Interviews - Software Design, Architecture, and More

101 ratings at CodeSignal

Practice technical interview questions through AI role-plays with instant personalized feedback across software design, architecture, networking, cloud, performance, and security.

• CodeSignal
• 7 hours
• Self-Paced
• Free Certificate
• 4 courses

Getting Started with Angular: Initial Setup and Basics

1 rating

Learn Angular fundamentals by setting up a project, organizing its structure, and building components with data binding and template control flow.

• CodeSignal
• 1 hour
• Self-Paced
• Free Certificate

Getting Started with JavaScript

1 rating

Learn JavaScript basics by writing scripts with variables, data types, comparison and arithmetic operators, type conversion, conditionals and ternaries, and string concatenation.

• CodeSignal
• 2 hours
• Self-Paced
• Free Certificate

Iterating Over Data in JavaScript

1 rating

Loop over data in JavaScript with for, for-in, and for-of loops, while loops, nested loops, and break and continue statements, through space-themed challenges.

• CodeSignal
• 2 hours
• Self-Paced
• Free Certificate

Getting Started with Java

1 rating

Learn Java fundamentals: write your first program, declare variables and constants, use primitive types and conversions, apply comparison, arithmetic and conditional logic, and concatenate strings with StringBuilder.

• CodeSignal
• 2 hours
• Self-Paced
• Free Certificate

Introduction to Responsive Web Development

1 rating

Build web pages that adapt to any screen: apply media queries, fluid layouts, responsive images and video, box-sizing, and adaptive navigation menus.

• CodeSignal
• 1 hour
• Self-Paced
• Free Certificate

Getting Deeper into React

1 rating

Go deeper into React components: use the useEffect hook for side effects and prop changes, split complex state, and handle refs, controlled inputs, and form validation.

• CodeSignal
• 4 hours
• Self-Paced
• Free Certificate

Client-side Web Development with React.js

1 rating

Build React interfaces: create components with props, manage state with useState and the Context API, handle forms, route with React Router, and fetch data using Axios.

• CodeSignal
• 4 hours
• Self-Paced
• Free Certificate

Advanced Query Techniques and Conditional Logic in SQL

1 rating

Write sharper SQL queries: filter with AND/OR, LIKE, IN and BETWEEN, nest subqueries, and categorize results using IF and CASE statements.

• CodeSignal
• 1 hour
• Self-Paced
• Free Certificate

Feature Engineering for Text Classification

1 rating

Turn raw text into model-ready features: tokenize movie reviews, build Bag-of-Words and TF-IDF vectors, work with sparse matrices, and reduce dimensions with TruncatedSVD.

• CodeSignal
• 5 hours
• Self-Paced
• Free Certificate

Non-linear Dimensionality Reduction Techniques

1 rating

Learn to use t-SNE, LLE, and kernel PCA to visualize hidden patterns, tune parameters, and reduce complex datasets to lower dimensions.

• CodeSignal
• 3 hours
• Self-Paced
• Free Certificate

NumPy Basics

1 rating

Learn to use NumPy arrays for efficient numerical computation in Python, from creation and indexing to reshaping, Boolean selection, and basic statistics.

• CodeSignal
• 3 hours
• Self-Paced
• Free Certificate

Introduction to TF-IDF Vectorization in Python

1 rating

Learn to convert text into TF-IDF numerical features in Python, customize vectorization parameters, remove stop words, and inspect influential terms for predictive modeling.

• CodeSignal
• 2 hours
• Self-Paced
• Free Certificate

Introduction to PHP Basics

1 rating

Learn PHP fundamentals through space-themed exercises covering output, comments, variables, operators, indexed arrays, and associative arrays.

• CodeSignal
• 2 hours
• Self-Paced
• Free Certificate