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AI Engineering: Building AI Applications (LangChain, LLM APIs + more)

Learn to build AI applications using LLM APIs and cutting edge tools including LangChain, LangSmith, and LangGraph. This is developer training for the new era of programming.

18.5 hours 9 projects 194 + lessons

Rated 4.8 out of 5 on Trustpilot

Rated 4.8 out of 5 on Trustpilot

25 Days

Average time students take to complete this course.

Last updated: May 2026
Our students are getting hired by top companies. We can help you too.

What you'll learn

  • Use OpenAI & Gemini APIs to build real-world AI applications
  • Craft effective prompts using proven engineering techniques
  • Build chatbots, voice apps, and image generation tools
  • Use LangChain to create agents that use memory and tools
  • Work with embeddings & RAG for smarter search and Q&A
  • Build multi-step agents with LangGraph and LangSmith
  • Analyze, debug, and improve LLM-powered apps
  • Build a full-featured AI Research Assistant from scratch

This course is your hands-on path to becoming a Generative AI engineer...someone who doesn’t just use AI, but builds with it.

You’ll start by leveling up your Python skills, mastering how to structure modular code, handle APIs, and manipulate data. Then, you’ll dive deep into the world of large language models (LLMs)—how they work, how they’re trained, and how to talk to them effectively through advanced prompt engineering.

From there, it’s all about application. You’ll learn how to build real-world AI-powered apps using the OpenAI and Gemini APIs—working with chat, image, and audio features. You’ll go even further by learning frameworks like LangChain for chaining prompts and building agents, and LangGraph for orchestrating stateful, multi-step workflows. You’ll give your apps memory using embeddings and vector databases, and learn to debug and scale production-ready systems with LangSmith.

And it’s not just theory. Throughout the course, you’ll build chatbots, intelligent image tools, search-driven Q&A systems, and more. The final capstone brings everything together as you build a research agent that uses retrieval, tools, and reasoning to generate high-quality summaries of real-world data.

This is how you go from experimenting with AI… to engineering it.

What Else Should I Know?

By becoming a ZTM member you'll not only get access to all our bootcamp courses, bytes, and projects.

But you’ll also get to join our exclusive live online community classroom to learn alongside thousands of students, alumni, mentors, TAs and Instructors.

Most importantly, you'll be learning from an industry professional (Andrei) that has actual real-world experience with AI Engineering. He teaches you the exact strategies and techniques he uses in his role.

Finally, as with all ZTM courses, this course is a living thing. It will be constantly updated as the landscape changes so you can use it as your go-to guide for building smarter AI applications using RAG both now and throughout your career.

Join 1,000s of Zero To Mastery graduates that have gotten hired and are now working at companies like Google, Tesla, Amazon, Apple, IBM, JP Morgan, Facebook, Shopify + other top tech companies.

They come from all different backgrounds, ages, and experiences. Many even started as complete beginners.

So there's no reason it can't be you too.

And you have nothing to lose. Because you can start learning right now and if this course isn't everything you expected, we'll refund you 100% within 30 days. No hassles and no questions asked.

Who You Will Learn With

You're getting more than just a course

Our instructors, TAs, Mentors, Alumni, and fellow students go above and beyond to help guide you and ensure you're on the right path to achieve your goals. Our private ZTM Discord server is a key factor in taking your skills, confidence and career to the next level.

What you'll build

The best way to learn about AI is to actually build AI applications. Not just watch endless tutorials. That's why a key part of this course is the real-world projects that you'll build. Plus they'll look great on your portfolio.

Build a Conversational AI Agent with Gemini API

Build a Conversational AI Agent with Gemini API

Create a chat-based AI assistant using Google’s Gemini API. Learn how to handle conversations, stream responses, and build a responsive, real-world chatbot interface.

Build a Healthy Daily Meal Planner with OpenAI API

Build a Healthy Daily Meal Planner with OpenAI API

Use the OpenAI API and DALL·E to generate a full day of healthy meals, complete with recipes and original images. Learn prompt design and multi-modal AI workflows.

Build a Q&A App for Private Documents using RAG and LangChain

Build a Q&A App for Private Documents using RAG and LangChain

Build a smart Q&A system that answers questions from your own private documents using LangChain, embeddings, and vector databases for powerful, retrieval-based reasoning.

Build an AI Essay Writer and Reviser using LangGraph

Build an AI Essay Writer and Reviser using LangGraph

Design an AI essay writer that reflects, revises, and improves its drafts. Learn how to build iterative, agentic workflows with LangGraph and custom logic.

Build a Master Research Agent with LangGraph, GPT-4o, RAG, Pinecone, ArXiv, and Google SerpAPI

Build a Master Research Agent with LangGraph, GPT-4o, RAG, Pinecone, ArXiv, and Google SerpAPI

Build a full-stack research assistant that finds, summarizes, and structures insights from ArXiv and the web—powered by GPT-4o, LangGraph, RAG, and real-time tools.

+ 4 more exciting projects to practice your new skills

Course curriculum

To make sure this course is a good fit for you, you can start building AI applications for free right now by clicking any of the PREVIEW links below.

22 sections194 lessons18.5 hours total length

Section 00 - Introduction

6 lectures · 2min
6 lectures · 2min

AI Engineering Bootcamp: Building AI Applications·2:01

2:01
PREVIEW

Exercise: Meet Your Classmates and Instructor

PREVIEW

ZTM Plugin + Understanding Your Video Player

PREVIEW

A Note on Course Prerequisites

PREVIEW

Course Resources

PREVIEW

Set Your Learning Streak Goal

PREVIEW

Section 01 - Virtual Environments in Jupyter Notebook

2 lectures · 19min
2 lectures · 19min

Section 02 - Essential Python Libraries for AI: Requests & Pandas

17 lectures · 1hr 41min
17 lectures · 1hr 41min

Section 03 - Introduction to LLMs, APIs, and AI Libraries

7 lectures · 48min
7 lectures · 48min

Section 04 - Deep Dive into LLMs

10 lectures · 1hr 15min
10 lectures · 1hr 15min

Section 05 - Diving into OpenAI API with Python

17 lectures · 1hr 37min
17 lectures · 1hr 37min

Section 06 - Prompt Engineering for Generative AI

10 lectures · 47min
10 lectures · 47min

Section 07 - OpenAI API Project: Building a Healthy Daily Meal Plan

6 lectures · 42min
6 lectures · 42min

Section 08 - Diving into Google’s Gemini API

12 lectures · 1hr 17min
12 lectures · 1hr 17min

Section 09 - Gemini API Project: Talking With an Image

7 lectures · 35min
7 lectures · 35min

Who is Zero To Mastery for?

You'll fit right in if:

You're struggling to make progress using free tutorials that aren't giving you the structure or clear path to achieving your goals.
You don't want to learn alone. You want personalized feedback, support, and motivation from instructors and mentors and want to be part of a supportive community of like-minded individuals.
You want to learn by doing. You're excited to embrace the struggle of making mistakes that comes with building fun real-world projects you'll be proud of.
You're sick of outdated & boring tutorials. We pride ourselves on having the most up-to-date (and fun!) courses in the industry so that you're not wasting your time and only learning what matters right now.
You can't afford to spend $8,000+ on over priced bootcamps and colleges. We got you. We'll help you go from zero to hired for less than the cost of a cup of coffee a day.

We're not for you if:

You're just going to watch the lessons and take no action. Our courses are all about getting your hands dirty with exercises and putting what you're learning into action by building fun and impressive real-world projects.
You're not ready to invest in yourself or just looking for the cheapest way to learn. If that's you, no problem, use our free Learn to Code + AI & Get Hired guide.
You don't think fundamentals matter anymore because AI can do everything for you. Understanding the fundamentals and how things really work will always be important.
You think AI is going to replace you and think there's nothing you can do about it. Well... if you keep wasting time not learning AI tools & skills, you're probably right. Or you embrace them, and 2x your productivity (and probably income too!).

Meet your instructor

Your instructor (Andrei) isn't just an expert with years of real-world professional experience. He has been in your shoes. He makes learning fun. He makes complex topics feel simple. He will motivate you. He will push you. And he will go above and beyond to help you succeed.

Andrei Dumitrescu

Hi, I'm Andrei Dumitrescu!

Andrei is a Senior Network & Software Engineer with 15+ years of experience and over 50,000+ students have taken at least one of his top-rated courses.

SEE MY BIO & COURSES

Andrei Dumitrescu

DevOps Engineer

Frequently Asked Questions

Are there any prerequisites for this course?

  • Basic Python knowledge is required. Don't have that? You can start learning today by taking our Python Bootcamp course!

Who is this course for?

  • Anyone who wants a step-by-step guide to learning to build AI applications and be able to get hired as an AI Developer or AI Engineer
  • Anyone who wants to launch or accelerate their career in AI
  • Students, Developers, Machine Learning Engineers, Data Scientists, AI Developers, and AI Engineers who want to demonstrate practical, professional-level skills by actually building real AI applications
  • Anyone looking to expand their knowledge and toolkit when it comes to AI
  • You're still confused and stuck after taking online AI application development tutorials
  • You're frustrated with your progress with all of the beginner AI software courses out there that don't go beyond the basics and don't give you real-world practice or skills you need to actually get hired

Do you provide a certificate of completion?

We definitely do and they are quite nice. You will also be able to add Zero To Mastery Academy to the education section of your LinkedIn profile as well.

Are there subtitles?

Yes! We have high quality subtitles in 6 different languages: English, Spanish, French, German, Arabic, and Hindi.

You can even adjust the text size, color, background and more so that the subtitles are perfect just for you!

Still have more questions about the Academy?

Still have more questions specific to the Academy membership? No problem, we answer some more here.

What students are saying

Our courses and community have helped 1,000s of Zero To Mastery students go from zero to getting hired to levelling up their skills and advancing their careers to new heights.

Rated 4.8 out of 5 on Trustpilot

Learn the skills to stand out and get hired. In the age of AI.

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