1
Choose a Common Problem
Choose from System Design and Low-Level Design problems you're likely to see in real interviews.
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, focused feedback.
System Design
Low-Level Design
AI-Enabled Coding
Behavioral100,000+ engineers practicing · Free to start
Master your interview with
engaging, practical exercises
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 to the expectations of experienced interviewers.
System Design · Demo
See Guided Practice for System Design in action
- Whiteboard-first — diagram as you explain, while the interviewer follows your drawing
- Step-by-step prompts that mirror a real System Design interview 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 actionable feedback.
Most popularSystem 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 peer comparison
Low-Level Design
Object-oriented modeling for your LLD/OOD round. Practice parking lots, elevators, rate limiters, and more.
9 problems~35 min each
AI-Enabled Coding
Ship a real feature with an AI pair. Build the habits to prompt, review, verify, and deliver working code.
12 problems~45 min each
Behavioral
Practice leadership, conflict, and ambiguity questions against the rubrics real interviewers use.
Every role & level~5 min per question
Ready to go all-in?
Unlock every problem across all four tracks and the complete learning library.
1 Month Access
$59Access until Aug 24, 2026- System Design, Low-Level Design, Concurrency, and Behavioral courses
- Guided Practice for System Design, Low-Level Design, and AI Coding
- Interview question library with 12,000+ questions
- AI tutor to answer your questions
- Does not auto-renew
1 Year Access
$99Access until Jul 24, 2027- System Design, Low-Level Design, Concurrency, and Behavioral courses
- Guided Practice for System Design, Low-Level Design, and AI Coding
- Interview question library with 12,000+ questions
- AI tutor to answer your questions
- Upgrade to lifetime at any time
Lifetime Access
$349Lifetime access- Lifetime access to every learning course
- Guided Practice for System Design, Low-Level Design, and AI Coding
- Interview question library with 12,000+ questions
- AI tutor to answer your questions
- All future content included
Hear from recent users
“This platform is incredible.”
“This is really helpful. I was able to follow the feedback provided and improve my design.”
“I am very impressed at the use of AI to determine feedback for each step. Excellent experience and highly valuable feedback.”
“I loved it. The structure helped me understand the process and identify my weaknesses.”
“I never expected a practice session to be so engaging. Great use of AI for transcription and validating concepts.”
“This made me realize that I know more than I thought I did. Thank you so much.”
“The inputs nudged me in the right direction. I have never had the chance to practice system design like this.”
“One of the best uses of AI I've seen in a product.”
“Trying to answer the question before receiving feedback makes the material stick.”
“The AI suggestions were surprisingly useful. I found it very helpful in my interview preparation.”
“The framework for approaching any system design problem is amazing and follows an iterative process.”
“Great platform, easy to use, and a strong simulation of interview scenarios. The feedback was specific and on point.”
“Each time I attempt a problem, I learn something new based on the feedback. I am loving it.”
“This was my first system design interview. It felt really nice to learn in this setting.”
“Wonderful experience. I love the feedback. This tool is revolutionary.”
“The voice option is great because it forces you to practice verbal communication. This is the future of interview prep.”
“Getting feedback while writing the answers is brilliant.”
“Amazing experience. This is exactly what I needed to prepare for Meta.”
NihaoInterview Premium FAQ
What is included with NihaoInterview Premium?
Premium unlocks the complete learning library, exclusive deep dives, every Guided Practice problem, and the full interview question library.
Is future content included with Premium?
Yes. New content released during your access period is included.
Do you offer any discounts?
Available discounts are applied consistently at checkout so everyone sees the same pricing rules.
Can I upgrade from month to year or year to lifetime?
Yes. Active Premium access can be credited toward a longer plan when account billing is enabled.
Do I need Premium to access the content?
No. A substantial part of the learning library and one complete guided scenario are available for free.
Does the purchase auto-renew each year or month?
No. Each plan is a one-time purchase and does not auto-renew.
Will I have access to new practice problems as they launch?
Yes. Fixed-duration plans include releases during the access window, and lifetime includes all future releases.
Is there a specific cadence for new content or problems?
New problems are released as they complete editorial and product review rather than on a fixed schedule.
Can you add a specific new problem?
Problem requests help prioritize the next additions to the practice library.
Is there a free trial for Premium?
There is no separate trial, but the free learning content and complete URL Shortener practice show how the product works before purchase.
What is your refund policy for Premium?
Because the learning material is consumable, refunds are considered only in exceptional cases before substantial use.
Can I share the account with someone else?
No. Premium access is licensed for personal use by one learner.
Can I transfer my account to another person or email address?
No. Premium access cannot be transferred to another person.
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