Become interview-ready with practical LLD + Concurrency training
Structured tracks for Java and C++, real-world machine coding problems, and a focused roadmap designed to help you perform under interview pressure.
Engineers from these companies have reviewed this course
Machine Coding Arena
Problem
45 minDesign an in-memory rate limiter (thread-safe)
class RateLimiter {
ConcurrentHashMap<String, Bucket> buckets;
boolean allow(String userId) { ... }
}
Tests running
72 / 96 checks passed
Output
> Compile OK
> Test #4: retrying
> Test #5: passed
What engineers are saying
From engineers at top companies
"Really helpful for FAANG prep. Highly recommend."
Guna Sree Kunkulagunta
SDE @Amazon
"Excellent for experienced engineers looking to brush up for system design rounds."
Supratik Dutta
Director @UBS, Ex-Tech Lead @Accenture
"Awesome. Exactly what I needed for my interview loop."
Anuj Kumar Gupta
Staff SDE @Walmart
1,500+ more reviews — scroll below to see all ↓
"Deep insights, logical thinking, learned a lot. Thanks."
Muhaly
"Good blogs with well-structured content. Really helpful."
Rasika Phutke
Developer @Jio
"Course has very good explanations. Highly recommended for interview prep."
Akash
"Great content. Very relevant for senior engineering interviews."
Guhan Muthu
Lead SDE @Freshworks
"Very helpful. Keep adding more company-wise questions to the course."
wizice
"Good course. Concurrency section is top-notch."
Akshay Phate
SDE @Wells Fargo
"Awesome course. Got to learn a lot about concurrent design."
Ankit Kumar Srivastava
SDE @Zeta (Directi)
"Really helpful for FAANG prep. Highly recommend."
Guna Sree Kunkulagunta
SDE @Amazon
"Good course. Clear explanations and solid problem sets."
Jackson Raj A
SDE @Netcracker, Ex-SAP
"Perfect. All things great — minor UI bugs in the IDE but content is excellent."
Mohamed Aly
"This course is really helpful for LLD interviews and also in real-world projects."
Akhil Kumar
"Great number of resources. They really help in my thinking process. Kudos!"
Mohit
"Very well structured. Learned a lot from the concurrency section."
Abhishek Singh
Senior SDE @Optum
"Excellent for experienced engineers looking to brush up for system design rounds."
Supratik Dutta
Director @UBS, Ex-Tech Lead @Accenture
"Really good. The practical problems make a huge difference."
Sampreetha
SDE @Daimler
"Very Helpful. Would love more C++ content."
Akhil
SDE @Modak
"Awesome. Exactly what I needed for my interview loop."
Anuj Kumar Gupta
Staff SDE @Walmart
"Good course. The thread synchronization section was especially clear."
Umang Ahlawat
SDE @Microsoft
"All good. Clean content and well thought-out problem sets."
Rajat Agarwal
SDE @RingCentral, Prev @Expedia
"Great so far. The IDE and test runner really help."
Kartik Dutta
SDE-3 @Cisco
"Super beneficial to practice problems under real constraints."
Prasanna
Senior SDE @Msys Tech
"Learning a lot from this course. Highly recommended."
Gajanana Ganjigatti
SDE-3 @Dell
"Keep it up. More company-tagged problems would be great."
Pavan
SDE @JP Morgan
"Good. More problems should be added over time."
Prashant Shukla
MTS @Oracle
"Deep insights, logical thinking, learned a lot. Thanks."
Muhaly
"Good blogs with well-structured content. Really helpful."
Rasika Phutke
Developer @Jio
"Course has very good explanations. Highly recommended for interview prep."
Akash
"Great content. Very relevant for senior engineering interviews."
Guhan Muthu
Lead SDE @Freshworks
"Very helpful. Keep adding more company-wise questions to the course."
wizice
"Good course. Concurrency section is top-notch."
Akshay Phate
SDE @Wells Fargo
"Awesome course. Got to learn a lot about concurrent design."
Ankit Kumar Srivastava
SDE @Zeta (Directi)
"Really helpful for FAANG prep. Highly recommend."
Guna Sree Kunkulagunta
SDE @Amazon
"Good course. Clear explanations and solid problem sets."
Jackson Raj A
SDE @Netcracker, Ex-SAP
"Perfect. All things great — minor UI bugs in the IDE but content is excellent."
Mohamed Aly
"This course is really helpful for LLD interviews and also in real-world projects."
Akhil Kumar
"Great number of resources. They really help in my thinking process. Kudos!"
Mohit
"Very well structured. Learned a lot from the concurrency section."
Abhishek Singh
Senior SDE @Optum
"Excellent for experienced engineers looking to brush up for system design rounds."
Supratik Dutta
Director @UBS, Ex-Tech Lead @Accenture
"Really good. The practical problems make a huge difference."
Sampreetha
SDE @Daimler
"Very Helpful. Would love more C++ content."
Akhil
SDE @Modak
"Awesome. Exactly what I needed for my interview loop."
Anuj Kumar Gupta
Staff SDE @Walmart
"Good course. The thread synchronization section was especially clear."
Umang Ahlawat
SDE @Microsoft
"All good. Clean content and well thought-out problem sets."
Rajat Agarwal
SDE @RingCentral, Prev @Expedia
"Great so far. The IDE and test runner really help."
Kartik Dutta
SDE-3 @Cisco
"Super beneficial to practice problems under real constraints."
Prasanna
Senior SDE @Msys Tech
"Learning a lot from this course. Highly recommended."
Gajanana Ganjigatti
SDE-3 @Dell
"Keep it up. More company-tagged problems would be great."
Pavan
SDE @JP Morgan
"Good. More problems should be added over time."
Prashant Shukla
MTS @Oracle
20k+
Signups
1.5k+
Course reviews
4.9★
Avg rating
80+
Interview problems
Real interview style
Timed machine-coding rounds mirroring actual FAANG hiring loops.
Execution-first
Snippet support, full-code execution, and output logs — learn by doing.
Day-1 confidence
Company-tagged LLD + concurrency problems before your actual interviews.
Included in all Java plans
LeetCode-style LLD + Concurrency practice — built in
Don't just watch videos. Every Java plan ships with company-style LLD and multithreading challenges in an in-browser IDE. Submit solutions, compare approaches, and build real interview confidence.
What's inside
- Timed machine coding rounds
- LLD case studies with model solutions
- Concurrency debugging practice
- IDE + diagrams + discussion support
Java Plans
Java Plans
LLD & Concurrency (Java)
360 Days Access
₹3,600
33% off₹2,400
Best for
Short-term learners preparing for near-term interviews
- Full access to complete LLD & Concurrency curriculum for 360 days
- 50+ FAANG-style interview problems with concurrent Java solutions
- Video walkthroughs with UML + sequence diagrams
- Projects, source code, exercises, and regular content updates
12-hour full refund · No questions asked · Most competitors offer zero
LLD & Concurrency (Java)
Lifetime Access
₹5,400
37% off₹3,400
Best for
Serious long-term learners who want permanent access
- Everything in 360-day plan + lifetime ownership
- All future videos, modules, and content updates included
- Priority Q&A support and advanced company-tagged solutions
- Bonus: mock interviews at ₹499
12-hour full refund · No questions asked · Most competitors offer zero
C++ Plans
C++ Plans
LLD & Concurrency (C++)
360 Days Access
₹5,499
36% off₹3,499
Best for
C++ engineers targeting system design interviews
- Core LLD + machine coding curriculum in C++
- 30+ concurrent C++ interview problems
- Practice platform + IDE workspace access
- New questions and updates every month
12-hour full refund · No questions asked · Most competitors offer zero
LLD & Concurrency (C++)
Lifetime Access
₹7,099
28% off₹5,099
Best for
Learners building a long-term C++ interview playbook
- Everything in 360-day C++ plan
- Lifetime access to all current and future lessons
- Priority support and bonus advanced modules
- Single purchase for long-term preparation
12-hour full refund · No questions asked · Most competitors offer zero
Python Plans
Python Plans
LLD & Concurrency (Python)
360 Days Access
₹5,499
36% off₹3,499
Best for
Python engineers targeting system design interviews
- Core LLD + machine coding curriculum in Python
- 30+ concurrent Python interview problems
- Practice platform + IDE workspace access
- New questions and updates every month
12-hour full refund · No questions asked · Most competitors offer zero
LLD & Concurrency (Python)
Lifetime Access
₹7,099
28% off₹5,099
Best for
Learners building a long-term Python interview playbook
- Everything in 360-day Python plan
- Lifetime access to all current and future lessons
- Priority support and bonus advanced modules
- Single purchase for long-term preparation
12-hour full refund · No questions asked · Most competitors offer zero
FAQ