The right problem at the right time
Our machine learning engine learns how you think and puts the exact problem in front of you that moves you forward, so you walk in ready to ace the interview.
left, right = 0, len(s) - 112 of 12 tests passed
Coding interview prep, done right.
Join 50,000+ engineers who’ve landed six‑ and seven‑figure jobs at top tech companies - without burning out on LeetCode. Firecode helps you ace your interview with a machine learning engine that picks the right problem at the right time, from thousands of real interview questions. Firecode helps you stay sharp in the age of AI, with Firebot, a coach that helps you solve it yourself instead of handing you the answer. Firecode helps you remember what you learn, all the way to interview day. Firecode helps you learn faster with expert-curated questions, hints and solutions. Firecode helps you show up every day with streaks, milestones and a community that keeps you going.
Join for free and find out what the hype is about
50,000+engineers preparing with Firecode
1500+real interview questions from top tech companies
14languages, from Python to Rust
FAANG+offers landed at Google, Meta, Netflix, and more
AI took over coding, not understanding.
Coding interviews matter even more in the age of AI. What sets you apart today is learning concepts and patterns, not code.
Firecode users landed six‑ and seven‑figure jobs at
Prep that actually sticks
Most engineers grind hundreds of problems and forget them by interview day. Firecode makes sure what you learn is still there when it counts.
Never lose what you learn
Spend your time on what you are about to forget, not on what you already know.
Know when you're ready
See which patterns need more practice and which are ready for interview day.
NewJust startedOn its wayAlmost thereMastered
Learn it once, remember it on interview day
Solve a problem, see why the solution works, and practice it again just before you would forget it. That is how interviews start to feel easy.
A solve on Firecode: the code passes all five tests, Firebot points out the idea that made it work, and the problem climbs from New to Mastered as it comes back for review.
Built on learning science
Expert-curated questions and lessons, vetted at top tech companies and brought to life with multimodal learning, so what you learn stays with you all the way to interview day.
A recursive solution to Height of a binary tree, drawn one step at a time with the call stack beside the tree and a sentence for each step. Back, Next and the slider move through it.
Return the height of this tree: the number of nodes on the longest path from the root down to a leaf.
The first call starts at the root.
Not just another chatbot. A learning companion.
Other AI tools hand you the answer. Firebot helps you get there yourself, with the right hint at the right moment, so you actually learn it. You decide how much help you get.
Stay in flow. Firebot steps in only when you need a push.
What to try
What does every power of two have in binary that other numbers do not?
Your prep, planned for you
Open Firecode and start practicing. No spreadsheets, no endless lists, no guessing what to do next. Just progress you can see every day.
Loved and trusted by engineers
Thousands of mentions on Reddit, Blind and the other places engineers talk about their careers.
I’m a huge fan of Firecode! I’ve used it many times over the last few years to prep for interviews, and going back to just Leetcode sounds awful.
“I preferred Firecode for its SRS system, its i+1 approach to the difficulty curve, and the placement questions. It took the decision work out of where to start!”
“I tried Firecode for the first time today, and my god, it has been a wonderful experience! You all did an awesome job with it.”
“Firecode was the key to overcoming my anxiety with technical interviews. I ended up getting offers at almost every company I interviewed with!”
“I’ve been using Firecode to prepare for software developer interviews, and it’s been great! I love how easy it is to use and that everything is self-contained in the browser.”
“This website truly helped me become a better programmer when I was first looking for a job. It’s a must-have for any interview prep.”
“I’ve been using Firecode for years and always recommend it to my mentees at Hackbright Academy and elsewhere.”
“I got my first offer at Facebook thanks to Firecode!”
“Firecode’s spaced repetition helped me retain problem-solving patterns way better than brute-forcing hundreds of problems elsewhere.”
“I love how Firecode personalizes my learning journey. Every problem I solve feels like it was meant for me at that moment.”
“I’ve used a lot of platforms, but Firecode’s learning engine makes it by far the best for keeping skills sharp.”
“Firecode.io makes studying fun. The adaptive difficulty ensures I’m constantly challenged but never overwhelmed.”
“Firecode.io is like Anki for coding interviews-structured, optimized, and efficient!”
“I never thought I'd enjoy interview prep, but Firecode made it feel more like a game than a chore.”
“Thanks to Firecode, I walked into my interviews feeling confident and prepared.”
“Hi Team Firecode, I just wanted to express my appreciation for the effort of creating this great website.”
“I really enjoy everything that Firecode is doing! I already feel like a better coder from the problems I’ve worked on.”
“I've been on Leetcode and HackerRank, but I wanted to ramp up my problem-solving skills. Firecode.io gave me exactly what I needed.”
“Firecode was the main reason I landed an internship at one of my top goal companies! The repetition and explanations helped me more than anything else.”
“I just found Firecode and love the concept. It really resonated with me after weeks of grinding Leetcode.”
“I landed my dream job at Google thanks to Firecode!”
“Hey, I love your site! It’s really helped me practice my coding challenges over the last few years.”
“I never knew interview prep could be this effective. The adaptive learning system keeps me engaged and always progressing!”
“Firecode.io’s review system made sure I never forgot concepts, unlike other platforms where I’d solve a problem and forget it the next day.”
“Firecode kept me accountable. With spaced repetition and personalized recommendations, I always knew what to work on next.”
“I was stuck in tutorial hell until I found Firecode. Now, I’m solving problems instead of just watching videos.”
“I wish I found Firecode sooner! I wasted months grinding random Leetcode problems when I could have been using this method.”
“Firecode.io adapts so well that I never feel stuck. Just the right challenge level every time!”
“I had been struggling to get past first-round interviews, but Firecode changed everything. I finally got an offer!”
“Firecode is an incredible platform! I recommend it to everyone I know who’s doing interview prep over Leetcode.”
“Hello! I love the product; it’s been such a helpful tool in my interview prep.”
“My coworker successfully transitioned to a more technical engineering role using Firecode and highly recommended it to me. I see why now!”
“I loved Firecode when I was looking for a job last time, and now that it’s time again, I’m excited to use it again!”
“I prepped with Firecode in 2017 and landed a great job. I raved about it to all my friends and am using it again now-Leetcode just doesn't cut it for me.”
“Firecode helped me ace my Amazon interview!”
“As an Electrical Engineer transitioning into software, I needed something less intimidating than Leetcode. Firecode was exactly what I was looking for.”
“I landed a role at a FAANG company, and Firecode was a crucial part of my preparation journey. Couldn’t have done it without it!”
“Firecode felt like having a coding coach guiding me on what to do next. No more wasted time choosing problems!”
“I never had confidence in my coding skills until I started using Firecode. Now, I feel ready to crush any interview.”
“Firecode isn’t just for job prep. It’s made me a better engineer in my day-to-day work too.”
“Firecode's algorithm made sure I wasn't just doing random problems, but actually improving my weak areas.”
“I passed my Google onsite after just 3 months of consistent Firecode practice. Highly recommend!”
“I preferred Firecode for its SRS system, its i+1 approach to the difficulty curve, and the placement questions. It took the decision work out of where to start!”
“Firecode is an incredible platform! I recommend it to everyone I know who’s doing interview prep over Leetcode.”
“I really enjoy everything that Firecode is doing! I already feel like a better coder from the problems I’ve worked on.”
“Firecode was the key to overcoming my anxiety with technical interviews. I ended up getting offers at almost every company I interviewed with!”
“My coworker successfully transitioned to a more technical engineering role using Firecode and highly recommended it to me. I see why now!”
“Firecode was the main reason I landed an internship at one of my top goal companies! The repetition and explanations helped me more than anything else.”
“This website truly helped me become a better programmer when I was first looking for a job. It’s a must-have for any interview prep.”
“I prepped with Firecode in 2017 and landed a great job. I raved about it to all my friends and am using it again now-Leetcode just doesn't cut it for me.”
“I landed my dream job at Google thanks to Firecode!”
“I got my first offer at Facebook thanks to Firecode!”
“As an Electrical Engineer transitioning into software, I needed something less intimidating than Leetcode. Firecode was exactly what I was looking for.”
“I never knew interview prep could be this effective. The adaptive learning system keeps me engaged and always progressing!”
“I love how Firecode personalizes my learning journey. Every problem I solve feels like it was meant for me at that moment.”
“Firecode felt like having a coding coach guiding me on what to do next. No more wasted time choosing problems!”
“Firecode kept me accountable. With spaced repetition and personalized recommendations, I always knew what to work on next.”
“Firecode.io makes studying fun. The adaptive difficulty ensures I’m constantly challenged but never overwhelmed.”
“Firecode isn’t just for job prep. It’s made me a better engineer in my day-to-day work too.”
“I wish I found Firecode sooner! I wasted months grinding random Leetcode problems when I could have been using this method.”
“I never thought I'd enjoy interview prep, but Firecode made it feel more like a game than a chore.”
“I passed my Google onsite after just 3 months of consistent Firecode practice. Highly recommend!”
“I had been struggling to get past first-round interviews, but Firecode changed everything. I finally got an offer!”
“Hi Team Firecode, I just wanted to express my appreciation for the effort of creating this great website.”
“I tried Firecode for the first time today, and my god, it has been a wonderful experience! You all did an awesome job with it.”
“Hello! I love the product; it’s been such a helpful tool in my interview prep.”
“I've been on Leetcode and HackerRank, but I wanted to ramp up my problem-solving skills. Firecode.io gave me exactly what I needed.”
“I’ve been using Firecode to prepare for software developer interviews, and it’s been great! I love how easy it is to use and that everything is self-contained in the browser.”
“I loved Firecode when I was looking for a job last time, and now that it’s time again, I’m excited to use it again!”
“I just found Firecode and love the concept. It really resonated with me after weeks of grinding Leetcode.”
“I’ve been using Firecode for years and always recommend it to my mentees at Hackbright Academy and elsewhere.”
“Firecode helped me ace my Amazon interview!”
“Hey, I love your site! It’s really helped me practice my coding challenges over the last few years.”
“Firecode’s spaced repetition helped me retain problem-solving patterns way better than brute-forcing hundreds of problems elsewhere.”
“I landed a role at a FAANG company, and Firecode was a crucial part of my preparation journey. Couldn’t have done it without it!”
“Firecode.io’s review system made sure I never forgot concepts, unlike other platforms where I’d solve a problem and forget it the next day.”
“I’ve used a lot of platforms, but Firecode’s learning engine makes it by far the best for keeping skills sharp.”
“I never had confidence in my coding skills until I started using Firecode. Now, I feel ready to crush any interview.”
“I was stuck in tutorial hell until I found Firecode. Now, I’m solving problems instead of just watching videos.”
“Firecode.io is like Anki for coding interviews-structured, optimized, and efficient!”
“Firecode's algorithm made sure I wasn't just doing random problems, but actually improving my weak areas.”
“Firecode.io adapts so well that I never feel stuck. Just the right challenge level every time!”
“Thanks to Firecode, I walked into my interviews feeling confident and prepared.”
Start for free
Every feature, free for 14 days. Not for you? Cancel in one click.
Questions
What is Firecode?
Firecode is the coding interview prep platform built around an SM2-boosted learning engine. It draws from 1,500+ real interview problems asked at companies like Google, Amazon, Meta and Apple, and puts the right one in front of you at the right time, so what you learn is still there on interview day.
Is Firecode free?
For 14 days. You pick a plan and add a card, and nothing is charged until the trial ends. The plans are $59 a month, $288 for six months, or $729 once.
How is Firecode different from LeetCode?
LeetCode gives you 3,000+ problems and leaves the choosing to you. Firecode chooses for you, from your target companies and what you are about to forget, so every session counts. LeetCode is a problem bank. Firecode gets you ready.
Is Firecode good for beginners?
Yes. Firecode finds your level on day one, starts you on the foundational patterns and raises the difficulty as you grow, so you are never lost and never bored.
How many problems does Firecode have?
1,500+ curated problems drawn from real interviews at top tech companies, covering arrays, strings, linked lists, trees, graphs, dynamic programming, sorting, searching, stacks, queues, heaps, hash tables, bit manipulation and more.
What languages can I use?
Fourteen: Python, Java, JavaScript, TypeScript, C++, C#, Go, Ruby, Kotlin, Swift, Scala, PHP, Dart and Rust.
Does Firebot just give me the answer?
Only if you want it to. Firebot gives you hints that get you to the answer yourself, so you actually learn it and remember it.
How long should I prepare for a FAANG interview?
Most engineers need 2-4 months of consistent daily practice. With Firecode, 22 minutes a day covers the major patterns and keeps them fresh for the interview. Set your target companies early and their questions come first.
Can I use Firecode alongside other platforms?
Yes. Many members pair Firecode with LeetCode contests or AlgoExpert videos. Make Firecode your daily practice so what you learn sticks, and use the others for extras like competitive programming or video walkthroughs.
What happens after the trial?
The plan you picked begins and your card is charged. To stop before then, cancel from your account page.
Your next offer starts here.
Practice built around your level and your interview date, so you show up ready.
Start freeJoin 50,000+ engineers preparing with Firecode