AlgoCademy
Start learning free
57,000+ LEARNERS · 650+ LESSONS · 11 LANGUAGES

Think like a
software engineer.Get hired in the age of AI.

AI can write code. Your edge is problem-solving.

Start learning for free Try a free mock interview
Free to start, no card needed Python, Java, C++, JavaScript and 7 more
“Now I can solve coding questions on my own” Ankit K.“Got the offer at Vanguard!” Connor H.“Landed offers from Microsoft and Uber” Cristina R.
A lesson in AlgoCademy: the step to write, the line typed in the editor and checked, Step 3 passed; then a typo, the error pointing at its line, the fix, and Step 4 passed.

AlgoCademy students have landed roles at

Google, Amazon, Meta, Netflix, and UberIndividual student outcomes; your path will be your own.

FROM “I’VE SEEN THIS” TO “I CAN SOLVE THIS.”

Understand it, build it,
then solve it alone.

Think the idea through in an interactive lesson, write the code one checked step at a time, then solve it again without the steps.

01

Think it through.

Before any code, an interactive lesson walks you through the idea: tap the answer, predict the next value, trace a small example by hand. In Python, Java, JavaScript, C++ and C#, with a video solution when you want it explained.

The Interactive tab of Number of Islands: a 4 by 5 grid of 1s and 0s and the question “Tap the cells of the island that contains cell (0, 0)”, with two cells picked.
02

Build it step by step.

Write a line or two at a time, on the line the step marks. A picture shows what the new line does to the example. Take a hint or reveal the code when you’re stuck.

Step 3 of Number of Islands: “write a second for loop over every column index j”, and below it a picture titled “Step 3 adds the loop over columns j”, with the grid and the values of i and j.
03

Get unstuck, then solve it alone.

The AI tutor sees your code and explains what’s wrong without giving the answer away. Then turn Guided off and write the whole solution yourself, against every test.

The AI Tutor tab after a wrong step: “Your inner loop uses the number of rows again, but it needs to use the number of columns. Get that count from the length of the first row, grid[0].”

BUILD YOUR FOUNDATION. THEN RAISE THE BAR.

Learn to code. Pass interviews.
Build programs.

Every course has the same three parts. Start from your first line of code, or go straight to interview practice, then build bigger programs.

PART 1 · ABOUT 290 LESSONS

Learn to code

Variables, conditions, loops, lists, strings, functions and the basics of classes. From your first line of code to solving problems on your own.

VariablesLoopsStrings
PART 2 · ABOUT 310 LESSONS

Coding interviews

Big O first, then twenty chapters of the patterns interviews ask about, from brute force and two pointers to trees, graphs and dynamic programming.

Big OHash tablesDynamic programming
PART 3 · ABOUT 70 LESSONS

Build programs

Your own cat, grep, sort and four more command-line tools, then object-oriented programming with projects to build.

Command-line toolsClassesProjects
650+ lessons in every coursePython · JavaScript · Java · C++ · C# · TypeScript · Go · Kotlin · Scala · Swift · Rust
Explore the curriculum

ONE ACCOUNT, SIX WAYS IN

Pick where
to start.

Start where you are, and switch any time.

NEW TO CODING

Learn to code

From your first line to loops, lists and functions, with feedback on every line.

Write your first line
INTERVIEW PREP

Pass coding interviews

Twenty chapters of interview patterns. Each problem in steps you write and check.

Try an interview problem
AI MOCK INTERVIEWS

Practice the interview

An AI interviewer asks, listens and pushes back, then gives you a scorecard.

Try a mock interview
SYSTEM DESIGN

Design real systems

One decision at a time: the numbers, the parts, then you draw it.

See the lessons
AI CODING PRACTICE · NEW

Code with an AI teammate

Real codebases and client tickets. The AI makes mistakes. You catch them.

Try a ticket
BUILD WITH AI · NO CODE

Build apps by talking

Find out what a client needs, tell the AI, and check it before you deliver.

Meet your first client

NEW · AI CODING PRACTICE

Practice how the job
works now.

AI writes more and more of the code. The job is knowing what to ask for, and catching what it gets wrong.

  1. A client ticket in a real codebase, with tests.
  2. An AI teammate writes the code, and makes the mistakes AI makes.
  3. You check it before the client does. Miss something and it comes back.

AI Ticket Round: the same work as a timed interview, with a scorecard.

Try a ticket
AI coding practice: Marta’s ticket, the code the AI teammate wrote and the chat with Marta; then Marta sends it back because a booking slipped through; then Accepted, with scores for asking, protecting and directing.

IF YOU’VE TRIED OTHER SITES.

How AlgoCademy
is different.

Problem sites hand you problems. Most courses teach the language. AlgoCademy teaches the part in between: getting from a problem to working code.

Tried LeetCode and got stuck?

Every problem is broken into small steps you write and check, with a picture of what each step does. You never face an empty editor alone.

Finished a course but can’t solve problems?

Part 2 starts from Big O and works through the patterns interviews ask about, one problem at a time, in the language you already know.

Watched solution videos that didn’t stick?

You write every line yourself, and the tests check it before the next step appears. The video is there when you want the idea explained.

REAL PEOPLE. NEW CONFIDENCE.

From practice
to job offers.

From getting unstuck to taking the next career step. Here’s how students describe their experience.

Read more student stories
After going through all the lessons, I gained the necessary skills to perform well at my on-sites. I crushed even the DP problems, which were my biggest fear. And thanks to that I landed offers from Microsoft and Uber. Thank you AlgoCademy!
Cristina Radulescu Landed offers from Microsoft and Uber
AlgoCademy really helped me improve my problem solving skills and write incredibly clean code. I was worried it wouldn’t be done in time for my coding interviews, but the way the curriculum is structured made me progress very quickly. Thanks for your work!
Connor Holland Student story · Vanguard
Wow. I've been using AlgoCademy for a while and now I can finally solve coding questions on my own. This gave me the confidence I needed for my interviews, and guess what? I landed the offer at Samsung! You guys truly kick ass. High fives!
Ankit Kumar Landed an offer at Samsung
Hear Connor’s story His experience learning with AlgoCademy

ENGINEERS WHO LOVE THE “AHA” MOMENT.

Built by engineers from
Facebook and Amazon.

Learn from instructors whose experience spans software engineering, competitive programming, and years of helping others learn.

Andrei Chiriac

SOFTWARE ENGINEER & INSTRUCTOR

Andrei Chiriac

Andrei has worked at Amazon and Keystone and earned a bronze medal at the Central European Olympiad in Informatics. Since 2015, he has coached students for programming competitions and coding interviews.

LinkedIn YouTube
Mircea Dima

FOUNDER & SOFTWARE ENGINEER

Mircea Dima

Mircea has worked at Facebook, Adobe, Ubisoft, and startups. His engineering experience includes autocorrect, swipe typing, and music recommendations, alongside more than a decade of programming and interview coaching.

LinkedIn

CURIOSITY WELCOME.

Questions before
you start.

Still wondering about something?
Ask the AlgoCademy team ↗

Is AlgoCademy right for beginners?

Yes. Part 1 of every course starts from your very first line of code and takes you to solving problems on your own. You don’t need a Computer Science degree.

Will this help me prepare for coding interviews?

Part 2 covers the patterns behind the questions top tech companies ask, from two pointers to dynamic programming. You practice reasoning through problems and writing clean solutions. Your results depend on your preparation and individual circumstances.

Which programming languages can I use?

Python, JavaScript, Java, C++, C#, TypeScript, Go, Kotlin, Scala, Swift and Rust. Every course has the same lessons, and your progress is shared between them.

How are interactive lessons different from videos?

You build the solution yourself, a line or two at a time, and the lesson’s tests check every step before the next one appears. The video solutions are there when you want the idea explained.

Is there an AI tutor?

Yes. The AI tutor sits next to every lesson and knows the problem, the step you’re on and your code, so you can ask why a check fails or what to try next. Plus and PRO members get unlimited tutor help.

Can I learn at my own pace?

Yes. Everything is available from day one, with no weekly drip. AlgoCademy remembers where you stopped, and you can go back to any lesson or step.

Can I use it on my phone?

Yes. Lessons work in your phone’s browser, though a keyboard makes writing code easier.

Can I try it before subscribing?

Yes. Part of every course is free, including a set of coding interview questions, and you don’t need a card. PRO yearly also starts with a 7-day free trial. See the plans.

ONE SMALL STEP TOWARD YOUR NEXT BIG THING.

Your next breakthrough
starts with a little practice.

Open a lesson. Try an idea. See what clicks.

Start learning for free 650+ lessons · 11 languages · Free to start