CodeSignal Courses

Career Certificate

Git Version Control for Beginners

529 ratings at CodeSignal

Learn Git fundamentals, including commits, branching, undoing changes, remote repositories, collaboration, and advanced version-control features.

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

Career Certificate

Generative AI for Everyone

494 ratings at CodeSignal

A practical introduction to generative AI for communicating with language models, creating content and images, and exploring voice and video generation.

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

Career Certificate

Advanced Interview Prep for Senior Engineers in Java

465 ratings at CodeSignal

Prepare for senior Java engineering interviews through advanced data structures, design patterns, refactoring, backward compatibility, and problem-solving practice.

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

Career Certificate

Advanced Interview Prep for Senior Engineers in JavaScript

441 ratings at CodeSignal

Prepares senior engineers for JavaScript interviews through advanced data structures, design patterns, refactoring, backward compatibility, and problem-solving practice.

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

Career Certificate

Introduction to SQL with an Online Shop

431 ratings at CodeSignal

Learn SQL fundamentals through online shop orders, including joins, functions, clauses, conditional logic, and advanced query techniques.

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

Career Certificate

Advanced Coding Interview Preparation with JavaScript

408 ratings at CodeSignal

Advance JavaScript coding interview skills through sophisticated algorithms, data structures, task decomposition, and efficient problem-solving techniques.

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

Career Certificate

Spring Boot REST API with Java & Gradle

409 ratings at CodeSignal

Build robust REST APIs with Spring Boot, Java, and Gradle, covering dependency injection, validation, exception handling, and JPA persistence.

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

Career Certificate

Mastering Design Patterns with Java

403 ratings at CodeSignal

Learn creational, structural, and behavioral design patterns in Java by building a sophisticated smart home system.

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

Career Certificate

Implementing AI Algorithms from Scratch

346 ratings at CodeSignal

Implement classic machine-learning algorithms from scratch—including regression, classification, ensembles, clustering, and neural-network basics—without machine-learning libraries.

• CodeSignal
• 21 hours
• Self-Paced
• Free Certificate
• 6 courses

Career Certificate

Introduction to Machine Learning with SciKit Learn

324 ratings at CodeSignal

Learn machine learning end to end with scikit-learn, from preprocessing and model training through regression, classification, evaluation, ensembles, and cross-validation.

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

Career Certificate

Programming in C# for Beginners

298 ratings at CodeSignal

Learn C# fundamentals through control flow, collections, functions, and object-oriented programming.

• CodeSignal
• 10 hours
• Self-Paced
• Free Certificate
• 6 courses

Career Certificate

Foundations of Retrieval Augmented Generation (RAG) Systems

289 ratings at CodeSignal

Learn how retrieval-augmented generation improves text generation accuracy through embeddings, semantic retrieval, vector databases, and complete RAG pipeline construction.

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

Career Certificate

Coding Interview Prep for Senior Engineers in Python

286 ratings at CodeSignal

Prepare for senior-level Python coding interviews by practicing complex data structures, data-stream manipulation, and filtering, projection, and aggregation techniques.

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

Career Certificate

Fundamental Coding Interview Preparation with C++

261 ratings at CodeSignal

Builds C++ syntax, looping, string, and problem-solving skills through focused practice for technical coding interviews.

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

Career Certificate

Four-Week Coding Interview Prep in Java

260 ratings at CodeSignal

Prepare for Java coding interviews through progressively harder practice, from foundational exercises and classic questions to complex algorithms.

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