Guided Practice for every round of your interview.
Work through real interview questions across System Design, Low-Level Design, AI-Enabled Coding, and Behavioral, step-by-step, with instant AI feedback tuned by FAANG interviewers.
100,000+ engineers practicing · Free to start
Master your interview with engaging, practical exercises
1
Choose a Common Problem
Choose from System Design and Low Level Design problems you're likely to see in real interviews.
2
Work Through the Problem
Work step-by-step through the problem, narrating your thinking just like you would in a real interview.
3
Receive Personalized Feedback
Get personalized feedback on each step of the design, tuned by FAANG interviewers with decades of experience.
See Guided Practice for System Design in action
Whiteboard-first — diagram as you explain, the AI reads your drawing
Step-by-step prompts that mirror a real FAANG System Design loop
Instant per-step feedback with specific, rubric-based coaching
Practice every type of interview you'll actually face
Each track is a full library of common problems with a step-by-step AI interviewer. Pick your weakness, work it in 30 minutes, and leave with feedback tuned by engineers who've sat on the other side of the table.
System Design
Build full architectures for common problems one step at a time — requirements, entities, API, high-level design, and deep dives.
Instant personalized feedback on each question
A final report with takeaways and a peer comparison at the end
34 problems · ~35 min each
Low-Level Design
Object-oriented modeling for your LLD/OOD round. Top problems like parking lots, elevators, rate limiters, etc
AI-Enabled Coding
The new ai coding round: ship a real feature with an AI pair. Graded on prompts, review, and final code.
Behavioral
Leadership, conflict, and ambiguity questions scored against the rubrics real interviewers use.
Ready to go all-in?
Unlock every problem across all four tracks and so much more with Premium.
1 Month Access
$59
Access to System Design, Low-Level Design, Concurrency, Behavioral courses
until
Guided Practice for System Design, Low-Level Design, and AI Coding
Interview Question Library with 10,000+ questions
to answer your questions
Does not auto-renew
$20 credit off your first mock interview
1 Year Access
$99
Access to System Design, Low-Level Design, Concurrency, Behavioral courses
until
Guided Practice for System Design, Low-Level Design, and AI Coding
Interview Question Library with 10,000+ questions
to answer your questions
Does not auto-renew
$20 credit off your first mock interview
Upgrade to lifetime at any time
Lifetime Access
$349
Lifetime access to System Design, Low-Level Design, Concurrency, Behavioral courses
Guided Practice for System Design, Low-Level Design, and AI Coding
Interview Question Library with 10,000+ questions
to answer your questions
All future content included
$20 credit off your first mock interview
Hear from recent users
"this platform is fucking incredible"
"This is really helpful. I was able to follow the feedback provided and improve my design. It is great."
"I am very impressed at the use of a LLM to determine feedback for each step. Excellent experience and highly valuable feedback."
"Your website is incredible. I've never used anything like it, and you've achieved something "next generation" here. I have no doubt that we'll all be using software similar to this in a few years once people realize how powerful this AI assisted model is."
"I loved it! I was so scared to even start practicing because of lack of structure. This have helped me a lot with understanding the process and identifying my weakness."
"This is awesome! I never expected a practice session to be so engaging. Great use of AI for transcription and validating concepts. Kudos!"
"Just want to say this is absolutely fantastic and made me realize that I know more than I thought I did, thank you so much"
"This has been an extremely engaging and helpful practice session. The inputs have been very helpful and have helped me design this system by nudging me with inputs. I have never had the chance to practice system design like this."
"I really love this tool!"
"One of the best uses of LLMs i've seen in a product."
"This is a really efficient way to practice for system design interviews. Watching videos and passively learning doesn't make the material stick. Actually trying to answer the question first before receiving feedback and checking the answer key helps a lot."
"Very impressive product! It was good practice, and the AI suggestions were surprisingly useful. I definitely found it helpful in my interview preparation."
"This tool is insane. I have been racking my brains trying to study for my system design interview on my own and trying to determine where/why my solution is meeting/missing the bar. I feel my progress in solving system design questions just 10x'd with this tool. Thanks so much for building it!"
"One of the best ways to learn system design. More specifically, the framework for approaching any system design problem is amazing and follows an iterative approach to build the system."
"Great platform, easy to use and simulate the interview scenarios. Feedback was on point with very specific details."
"This allow me to practice again and again. Each time when I attempt, I learn something new based on the feedback. I am loving it. Hopefully I can apply this in my interview effectively"
"Can't stress enough how much I love these Guided Practice tools!!"
"This is phenomenal"
"I loved the flow of this - this was my first ever system design interview, it felt really nice to learn in this setting!"
"Wonderful experience. I love the feedback. This tool is revolutionary."
"This is fucking incredible. This practice functionality is the future of interview prep. Having the voice option is great, it mimics an interview pretty closely since it forces you to practice verbal communication. Kudos to you guys, this was money well spent for me."
"Getting feedback while writing the answers is brilliant."
"Amazing experience! This is exactly what i needed to prepare for Meta"
"Not going to lie, this is one of the coolest tools I have ever used. Wish I had more feedback, but this is awesome thank you!!"
"Very impressed with this tool"
"Much, much better experience than I expected."
Hello Interview Premium FAQ
If you have an active premium membership, a credit is auto-applied at checkout when you buy more time. For month or year purchases, that credit is a small fixed amount that stacks on top of any live discount. For lifetime purchases, the credit is prorated based on what you paid and the time remaining on your current membership, so the earlier you upgrade, the larger the credit.
Heads up if you're thinking about starting on monthly and upgrading to yearly later: the top-off is a fixed credit, not a refund of what you paid for the month. That means monthly-then-upgrade costs more in total than buying the year plan upfront. If you're fairly sure you want a year, start with the year.
No, this is a one-time purchase. Your card won't be charged multiple times.
Yes! For fixed duration purchases, your access is valid for 1 year or 1 month from the date of purchase, and you will have access to all future problems (and new features) as they are released. For lifetime purchases, you will have access to all future problems and content as they are released.
No, we release new content and problems as we can. You can see recent additions on our changelog. If you want to see a specific problem you can vote for it.
We're adding problems all the time. If you want to see a specific problem you can vote for it.
No, the account is for your personal use only and cannot be transferred.
