CodeSignal Courses

Career Certificate

Learning SQL Scripting with Leo Messi

189 ratings at CodeSignal

An accessible introduction to SQL using Lionel Messi’s career statistics to teach joins, functions, clauses, conditional logic, and advanced queries.

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

Career Certificate

Advanced Coding Interview Preparation with C++

186 ratings at CodeSignal

An advanced C++ learning path for coding interviews, focusing on sophisticated algorithms, complex data structures, task decomposition, and efficient problem-solving strategies.

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

Career Certificate

Clean Code in Java Through Hands-on Practice

180 ratings at CodeSignal

Practice writing clear, maintainable Java code using clean code principles, class design, and DRY, KISS, and SOLID practices.

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

Career Certificate

Delivering Human-Centered Customer Experiences

163 ratings at CodeSignal

Build human-centered customer experiences through empathy, needs assessment, ownership, and follow-through that strengthen trust and customer loyalty.

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

Career Certificate

Advanced Coding Interview Preparation with C#

159 ratings at CodeSignal

Advanced C# interview preparation focused on sophisticated algorithms, complex data structures, and efficient problem-solving techniques.

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

Career Certificate

Introduction to ASP.NET Core and API Development

154 ratings at CodeSignal

Learn ASP.NET Core fundamentals by building REST APIs with Minimal APIs, using routing, middleware, error handling, and model binding.

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

Career Certificate

Introduction to Concurrency with C++

152 ratings at CodeSignal

Learn to build multithreaded C++ programs, synchronize threads, and implement lock-based and lock-free concurrent data structures while avoiding common concurrency pitfalls.

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

Career Certificate

Working with Different Files as Data Sources in Python

153 ratings at CodeSignal

Learn to use Python for manipulating, parsing, and processing text, CSV, JSON, and large data files.

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

Career Certificate

Implementing MVC ToDo App with Flask

146 ratings at CodeSignal

Build a secure Flask ToDo web app with MVC architecture, SQL database integration, HTML templates, and session authentication.

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

Career Certificate

Functional Programming in Python

144 ratings at CodeSignal

Master advanced functional programming in Python through higher-order functions, iterators, generators, functors, and monads.

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

Career Certificate

MCP Servers Made Easy with Python and OpenAI Agents

139 ratings at CodeSignal

Build Python MCP servers that let OpenAI agents use tools, access data, and execute actions across connected services.

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

Career Certificate

APIs Made Easy with Python and Flask

137 ratings at CodeSignal

Build Python web APIs with Flask, covering server setup, dynamic endpoints, HTTP methods, data validation, and JWT authentication.

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

Career Certificate

Four-Week Coding Interview Prep in JavaScript

132 ratings at CodeSignal

Prepare for JavaScript coding interviews through classic questions and algorithm practice spanning strings, lists, recursion, dynamic programming, and graphs.

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

Career Certificate

Mastering Algorithms and Data Structures in C++

133 ratings at CodeSignal

Learn to choose, implement, and analyze algorithms and data structures for different problems in C++, including hashing, sorting, searching, stacks, queues, and linked lists.

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

Career Certificate

Practice Essential Data Science Skills With Diamonds Dataset

122 ratings at CodeSignal

Build practical data science skills by analyzing the diamonds dataset—from cleaning and feature engineering to price regression in Python.

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