A learning-first approach

^1000to acing ^500coding interviews ^2500

to ^200getting ^200a FAANG ^100 software engineering job ^2000

Firecode.io uses machine learning algorithms along with curated real-world interview questions, solutions & a vibrant social community of learners to get you ready for your next coding interview.

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Coding Interview Prep - Done Right

Firecode.io was built by Software Engineers, for Software Engineers.

Our team created Firecode.io to help experienced developers, university graduates and college students navigate the maze that is coding interview preparation. Every feature we created was geared towards making coding interview preparation accessible, easy, and most importantly, fun!

Cloud Coding

A beautiful online IDE with a friendly social user experience - we believe coding interview preparation should be fun!

Real-World Interview Problems

Make the most of your practice with hundreds of curated problems and answers from real coding interviews sourced from the best tech companies.

Smart Practice

Machine Learning memory algorithms adapt to your skill and pick the most relevant interview questions for you to solve and master.

Social Learning that's Fun!

Stay on track with a vibrant community of motivated, like minded users. Discuss and vote on the best solutions & learn the best coding practices.

Correct Answers

With community voting and social discussions, Solution OverflowTM ensures you have access to the best, community vetted correct solutions.

Get Rewarded

Show off your coding skills with awards for each problem. Get rewarded for helping others & challenge your friends to practice with you!

Simulate Real-World Whiteboard Coding


Save time with Pre-Coded Abstract Data Types, APIs and helper functions

With key APIs and Data Structures provided out of the box - you can focus on the algorithm and coding constructs instead of spending valuable time coding the scaffolding.

Less Googling, More Coding with FiredocsTM

Want to check the class methods of a HashMap? Unfamiliar with a method signature? Firecode.io has you covered - with a Real-Feel Smart IDE that lets you quickly check key classes and constructs.

Interview Ninja in 4 steps

Join Firecode.io

Join Firecode.io

Have a coding interview coming up? Want to level up your coding skills? Rusty with algorithms and data structures? Join for free!

Choose Programming Language

Choose Programming Language

Three of the most popular coding interview languages - C, C++ and Java are available at launch. Scala, Python, Ruby, Javascript and Go will be added soon!

Calibrate Firecode.io Level


Answer a few simple questions to calibrate your starting level and personalize your learning track. Firecode.io adapts to your skill level as you progress.

Start Learning with Firecode.io

Start learning and have fun!

Prepare for your coding interview with Firecode.io's learning engine and carefully curated interview questions. Help others by voting and answering questions.

You're in Good Company


Top 10 Startups in Education and Kids


Top 10 Most Popular Startups of Jan 2016


Web Summit Alpha Class of 2015

Our users Firecode.io

Datt Goswami

"I have been using Leetcode, GeeksforGeeks, Careercup & Hackerrank, but this is the most useful and fun way to learn / program. It is similar to actual interviews that I gave using Collabedit at PlaceIQ, Zocdoc, Google was in Google Docs, Amazon in Hackerrank. Great work!"

- Datt Goswami

Software Developer - AvMet Applications, Inc
 @dattgoswami     LinkedIn
Avemt Applications Inc.
Brandon Giraldo

"Really loving this application! With this I get the coding review I need for software engineering interviews. I found it extremely helpful in reviewing many major data structures and algorithms. It's been an amazing companion and found it very helpful and engaging. With a nice UI, great explanations on complex topics, and being able to run code in the browser, I really recommend this app to anyone looking to prep for coding interviews. Love it!"

- Brandon Giraldo

Cornell University - B.S Information Science
 brandongiraldo.com     @BrandonGiraldo     Facebook
Cornell University
Dharmin Majmudar

"An app like this has been long due. I loved the user experience, test cases and tips on solving difficult interview problems. My Java skills definitely improved - this should help developers everywhere."

- Dharmin Majmudar

Texas Tech University - Computer Science
Tripadvisor - Software Engineer II - Palo Alto, CA
Ayush Chaudhary

"Firecode.io helped me crack the coding interview at some of my favorite companies! Being an ECE major, I started with solving Fibonacci and evenutally was able to solve some of the hardest problems!"

- Ayush Chaudhary

University of Southern California - M.S. EE
Intel - Software Engineer - Phoenix, AZ
Intel Corporation