LeetSys
AI-powered system design interview practice for FAANG prep
What is LeetSys? Complete Overview
LeetSys is an AI-powered platform designed to help users master system design interviews, particularly for FAANG companies like Google, Meta, Amazon, and Apple. It provides a realistic interview simulation with real-time feedback, interactive whiteboarding, and adaptive difficulty levels. The tool addresses key pain points in technical interview preparation by offering a comprehensive practice environment that mimics actual interview conditions. Target users include software engineers and technical professionals at all levels, from entry-level to senior positions, who are preparing for system design interviews at top tech companies.
LeetSys Interface & Screenshots

LeetSys Official screenshot of the tool interface
What Can LeetSys Do? Key Features
AI-Powered Interviews
Practice system design interview questions with an intelligent AI interviewer that adapts to your skill level and provides real-time feedback on your system architecture designs. The AI evaluates your responses and offers constructive criticism to help improve your performance.
Interactive Whiteboard
Draw system diagrams with an intuitive whiteboard interface. Create components, establish connections, and visualize your system architecture just like you would in a real interview. The whiteboard supports collaborative features and can be shared with others for feedback.
Voice Interaction
Practice speaking about your designs with real-time voice conversation capabilities. This feature simulates actual technical interviews where you need to articulate your thought process clearly and respond to follow-up questions.
Adaptive Difficulty
The system automatically adjusts question difficulty based on your experience level and performance. Whether you're an entry-level candidate or a senior engineer, LeetSys provides appropriate challenges to help you progress effectively.
Real FAANG Problems
Access a curated collection of 50+ actual system design problems from top tech companies. These problems reflect the types of challenges you'll encounter in interviews at Google, Meta, Amazon, Apple, and other leading firms.
Progress Tracking
Monitor your improvement over time with detailed analytics and personalized feedback. The platform tracks your performance across various metrics, helping you identify strengths and areas needing improvement.
Best LeetSys Use Cases & Applications
FAANG Interview Preparation
A software engineer preparing for interviews at Google uses LeetSys to practice system design problems similar to those asked in actual Google interviews. The adaptive difficulty ensures they're challenged appropriately as their skills improve.
Technical Skill Development
A mid-level developer looking to advance to senior positions uses LeetSys to strengthen their system architecture skills. The platform's feedback helps them understand complex distributed systems concepts better.
Team Training
An engineering manager subscribes to LeetSys for their team to improve collective system design capabilities. Team members practice together using the collaborative whiteboard features.
How to Use LeetSys: Step-by-Step Guide
Sign up or log in to the LeetSys platform using your email or preferred authentication method.
Select your experience level and interview focus area to receive appropriately tailored practice questions.
Begin a practice session where you'll be presented with a system design problem. Use the interactive whiteboard to sketch your solution.
Engage in voice conversation with the AI interviewer, explaining your design choices and responding to follow-up questions.
Receive real-time feedback on your performance, including analysis of your system architecture and communication skills.
Review your session analytics and track your progress over time to identify areas for improvement.
LeetSys Pros and Cons: Honest Review
Pros
Considerations
Is LeetSys Worth It? FAQ & Reviews
Yes, LeetSys offers a free plan with limited features so you can try the platform before committing to a paid subscription.
Our AI analyzes your responses and diagrams in real-time, providing feedback on both technical aspects of your design and your communication skills during the interview simulation.
Currently, LeetSys is optimized for desktop use to provide the best experience for diagramming and voice interaction. Mobile support may be added in future updates.
We regularly update our problem bank with new system design challenges based on current trends in tech interviews and user feedback.
Yes, we use industry-standard encryption and security measures to protect all payment information and user data.