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Master Software Engineering Interviews

Comprehensive learning paths for DSA, System Design, Low Level Design, and Behavioral interviews

DSA Patterns Course

DSA Patterns

Learn Data Structures and Algorithms systematically. Practice LeetCode problems grouped by patterns.

System Design Course

System Design Fundamentals

Build a rock-solid foundation in system design. Master distributed systems concepts and patterns.

System Design Interviews Course

System Design Interviews

Master system design interview concepts, patterns, technologies and 50+ interview questions

Low Level Design Course

Low-Level Design Interviews

Master OOP, design patterns, UML diagrams and practice low level design interview questions.

Concurrency Interview

Concurrency Interview

Master concurrency and multi-threading fundamentals and practice interview questions.

Behavioral Interviews Course

Behavioral Interviews

Master the STAR method, prepare compelling stories, and ace behavioral interview questions.

Master Patterns,Not Just Problems

Stop solving problems randomly. Learn the underlying patterns that show up across coding and system design interviews.

Coding Interviews

60+ patterns600+ problems
  • Two Pointers
  • Sliding Window
  • Prefix Sum
  • Binary Search
  • BFS
  • DFS
  • Backtracking
  • Dynamic Programming
  • Greedy
  • Union Find
  • Monotonic Stack
  • Intervals

System Design Interviews

20+ patterns55+ problems
  • Realtime Updates
  • Fanout
  • High Read Traffic
  • High Write Traffic
  • Hot Keys
  • Caching
  • Sharding
  • Replication
  • Leader Election
  • Traffic Spikes
  • Handling Failures

Built for Focused and Interactive Learning Experience

Listen to chapters, highlight key ideas, take inline notes, track your progress, and ask an AI tutor while you study.

01·Listen Mode

Prefer listening? You can play chapters as audio and go through it like a podcast with text highlighting. Also supports code and diagram narration.

Hash Maps: Introduction
0:00 / 0:26
Chapter 3 · Hash Maps
A hash map stores key-value pairs and gives you average constant-time lookup.
Collisions are handled with chaining or open addressing.
In the worst case, when every key hashes to the same bucket, lookups degrade to linear time.
A good hash function spreads keys evenly across the table so collisions stay rare.
Most languages ship a built-in hash map, like HashMap in Java and Map in JavaScript.
Growing Community

Trusted by 700K+ Learners Worldwide

LinkedIn240K+
YouTube260K+
Newsletter135K+
GitHub Stars90K+

Join our thriving community of developers systematically mastering technical interviews and advancing their careers

Loved by engineers

What Our Users Say

Real feedback from engineers at Meta, Google, Amazon, and Microsoft plus thousands of paid subscribers and learners.

Hired
“Ashish was the best DSA and System Design interviewer I've worked with. I thank him and his platform for helping me break into Meta.”
DB

Daniel Ball

SWE @ Meta

Hired
DSG

Dhanushkumar S G

SDE @ Amazon

“Algomaster's curated list of questions helped me brush up on my DSA concepts very quickly. The structured approach and well-selected problems made my preparation much more efficient and played a key role in helping me secure an offer from Amazon.”
Hired
AM

Arka Mazumder

SWE-III @ Google

“I had studied DSA, but when it came time to switch, I realized the importance of HLD/LLD. While there’s plenty of content available on DSA, quality resources for System Design are relatively scarce. That’s when I discovered AlgoMaster (Ashish). His clear and structured explanations of System Design concepts, along with his YouTube channel, helped me immensely—and with his guidance, I was able to crack Google and Amazon.”
Hired
EK

Eshita Khakharia

SMTS @ Salesforce

“I highly recommend Ashish, the author of AlgoMaster, for his exceptional guidance and support in preparing for Salesforce and other technical interviews. His expertise and teaching skills are outstanding, and I credit him for helping me crack two interviews and boosting my confidence. Ashish's resources and approach are invaluable, and I wholeheartedly endorse him as a mentor for anyone looking to excel in tech interviews and AlgoMaster and newsletter to keep yourself updated and increase your technical acumen.”
MV

Madhan Vadlamudi

Software Engineer III

“AlgoMaster has everything in one place — problem lists, patterns, solutions, newsletters, system design courses, everything you need to crack any company. Keep it simple. Use as few tools as possible to streamline your practice. Especially if you're in an early-career to mid-level role — AlgoMaster is more than enough.”
PTB

Pranoy Tez Boddu

SWE II @ Microsoft

“AlgoMaster turns DSA & system design prep into clear, practical lessons. The pattern-based approach and explanations are top-tier and interview-focused. I recommend it to my mentees and will keep pointing people here.”
AZ

Alexandre Zajac

SDE II @ Amazon

“I've been curating software engineering content for more than 2 years now and the AlgoMaster blog is the one I keep including in my digest. Clear, important, visualized system design topics to help you pass your next interview of grow deeper in your role.”

From the Community

A few words from our Substack and YouTube community

R

Ridhul

“One of the best resources for low level design which I've seen, explains every detail to the point”
SR

Sravya Revuru

“Thanks for such a good content. Really helpful. Appreciate your effort. I genuinely chose paid membership without even a thought.”
M

Miguel

“Thank you for sharing all this content you are of great value for the dev community.”
S

Sunil

“The material for learning LLD and preparing for LLD interviews is really great.”
P

Pawan

“I supported your work because, after seeing your videos, I gained confidence that I could do DSA and System Design.”
N

Nitin

“Your content and its structure is easier to follow. DP was one of my weakness and Bottom up was out of my league until I followed your DP patterns blog. Keep up the good work!”
PG

Parth Garg

“Your articles are to the point, has complete knowledge of topic, does not feel to check other resources.”
GU

Gowthami Uppula

“I believe this valuable information not provided any where. Thank you”
K

Kannan

“I find these articles easy to understand, at the same time very detail oriented.”
PA

Prakhar Agarwal

“Your system design content quality is sooo good. Please keep posting such quality content.”
SB

Shubhankar Bhadra

“The thought process is very intuitve and after one time read I am imemdiately able to realize it at a scaled level. My engineering level increase by delta after very quality read.”
J

Jeffrey

“I appreciate the effort you put into content creation for helping software developers succeed at their aspirations.”
R

Ridhul

“One of the best resources for low level design which I've seen, explains every detail to the point”
SR

Sravya Revuru

“Thanks for such a good content. Really helpful. Appreciate your effort. I genuinely chose paid membership without even a thought.”
M

Miguel

“Thank you for sharing all this content you are of great value for the dev community.”
S

Sunil

“The material for learning LLD and preparing for LLD interviews is really great.”
P

Pawan

“I supported your work because, after seeing your videos, I gained confidence that I could do DSA and System Design.”
N

Nitin

“Your content and its structure is easier to follow. DP was one of my weakness and Bottom up was out of my league until I followed your DP patterns blog. Keep up the good work!”
PG

Parth Garg

“Your articles are to the point, has complete knowledge of topic, does not feel to check other resources.”
GU

Gowthami Uppula

“I believe this valuable information not provided any where. Thank you”
K

Kannan

“I find these articles easy to understand, at the same time very detail oriented.”
PA

Prakhar Agarwal

“Your system design content quality is sooo good. Please keep posting such quality content.”
SB

Shubhankar Bhadra

“The thought process is very intuitve and after one time read I am imemdiately able to realize it at a scaled level. My engineering level increase by delta after very quality read.”
J

Jeffrey

“I appreciate the effort you put into content creation for helping software developers succeed at their aspirations.”
@

@maheshkoti6506

“You have solved 1583 problems on leetcode, that's great. But even greater is that by making this one video you are solving millions of DSA learners problem.”
@

@mithra05jk

“This is by far the most efficient 13 minutes I have spent on YouTube, every minute had precise content! Thank you.”
@

@sherlock-z1d

“Thanks for sharing. I had an interview at Uber Brazil. Since I had no DSA training, I didn't do well. But now I'm learning a lot from your videos. I'm improving a lot with these tips.”
@

@iamhimangshude

“I must say this is most basic and simple explanation ever, I've seen on System Design on YouTube!”
@

@dhareppabistagond6155

“Dear YouTube, why did I have to scroll so much to find THIS? Fix your search algorithm ASAP”
@

@Aashick_Nizar

“This video is a game-changer! Currently, I'm focused on the Algomaster 75 list, and I've already noticed a significant improvement in my problem-solving skills.”
@

@forkindev5757

“Your 15 patterns was really helpful. I have been doing it for a month. Though I haven't cracked any yet. I can identify patterns now while reading a problem.”
@

@maheshkoti6506

“You have solved 1583 problems on leetcode, that's great. But even greater is that by making this one video you are solving millions of DSA learners problem.”
@

@mithra05jk

“This is by far the most efficient 13 minutes I have spent on YouTube, every minute had precise content! Thank you.”
@

@sherlock-z1d

“Thanks for sharing. I had an interview at Uber Brazil. Since I had no DSA training, I didn't do well. But now I'm learning a lot from your videos. I'm improving a lot with these tips.”
@

@iamhimangshude

“I must say this is most basic and simple explanation ever, I've seen on System Design on YouTube!”
@

@dhareppabistagond6155

“Dear YouTube, why did I have to scroll so much to find THIS? Fix your search algorithm ASAP”
@

@Aashick_Nizar

“This video is a game-changer! Currently, I'm focused on the Algomaster 75 list, and I've already noticed a significant improvement in my problem-solving skills.”
@

@forkindev5757

“Your 15 patterns was really helpful. I have been doing it for a month. Though I haven't cracked any yet. I can identify patterns now while reading a problem.”
Founder · AlgoMaster.io

Meet the Creator

Ashish Pratap Singh, Founder of AlgoMaster.io

Ashish Pratap Singh

Software Engineer · Educator · Creator (ex-Amazon, Adobe)

Hi! I'm a software engineer passionate about helping others excel in coding interviews and level up their software engineering career.

After solving 1000s of coding problems across multiple platforms and going through countless technical interviews myself, I created AlgoMaster.io to make the learning process more systematic and enjoyable for everyone.

Frequently Asked Questions

Answers to commonly asked questions about AlgoMaster.io and Newsletter

Still have questions?

We're here to help! Contact us directly at contact@algomaster.io or ask in our Discord channel