CodeSignal Courses

Handling JSON Files with Scala

Learn to parse, map, manipulate, and write JSON data using Scala.

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

Large Data Handling Techniques in Scala

Learn to process large datasets in Scala using ZIP archives and batched CSV reading and writing.

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

Generative AI in 2025 - Overview and Practice

A practical introduction to generative AI covering prompt design, output evaluation, ethics, limitations, and future trends.

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

Mastering Communication with AI Language Models

Learn to turn vague goals into effective prompts and keep AI conversations on track while handling ethical edge cases.

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

Applying Generative AI in Everyday Professional Tasks

Use generative AI to write, summarize information, streamline routine work, and improve professional communication.

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

Making Things Shine - Practice and Learn Image Generation with AI

Create and refine AI-generated images with text prompts, using tools such as DALL-E and Midjourney for practical visual content.

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

Generative AI - The Next Frontier: Voice, Video, and More

Explore generative AI for voice and video, including multimodal applications, prompt refinement, ethical voice use, and future content-creation possibilities.

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

Career Certificate

Intro to GraphQL with Apollo Server 4 and TypeScript

Build GraphQL APIs with Apollo Server 4 and TypeScript, covering schema design, data fetching, authentication, and optimization.

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

Career Certificate

Coding Interview Prep for Senior Engineers in Ruby

Prepare for senior-level coding interviews by practicing Ruby classes, complex data structures, and transformations of large JSON and CSV data streams.

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

Career Certificate

Learning and Mastering Redis with C++ and Hiredis

Learn to use Redis with C++ and Hiredis, from core data structures to transactions, high-performance applications, and a Redis-backed system.

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

Career Certificate

Clean Code in C# Through Hands-on Practice

Practice writing clear, maintainable, and efficient C# code using clean code principles, class design, DRY, KISS, and SOLID.

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

Career Certificate

Clean Code in Kotlin Through Hands-on Practice

Practice Kotlin clean-code principles, including DRY, KISS, SOLID, and maintainable class design.

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

Career Certificate

Clean Code in TypeScript Through Hands-on Practice

Learn to write clear, maintainable TypeScript using clean-code principles for classes and multi-class software.

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

Career Certificate

Clean Code in Scala Through Hands-on Practice

Practice writing clear, maintainable, and efficient Scala 3 code using clean code principles, classes, traits, and multiple classes.

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

Career Certificate

Advanced Coding Interview Preparation with Kotlin

Advance Kotlin coding interview skills through multidimensional arrays, hash maps, task decomposition, algorithm mastery, and efficient problem-solving techniques.

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