Arslan Ahmad @arslan_ah
Empowering Engineers to Ace Coding and System Design Interviews | Creator of 'Grokking' Course Series | Founder Design Gurus designgurus.io Seattle, WA Joined April 2009-
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𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻 𝗠𝗮𝘀𝘁𝗲𝗿 𝗧𝗲𝗺𝗽𝗹𝗮𝘁𝗲: 𝗢𝗻𝗲 𝗧𝗲𝗺𝗽𝗹𝗮𝘁𝗲 𝘁𝗼 𝗥𝘂𝗹𝗲 𝗧𝗵𝗲𝗺 𝗔𝗹𝗹. Here is a master template that I used to discuss many #systemdesign problems in #interviews. It serves as a list of things that can be discussed during the interview.…
𝐒𝐭𝐚𝐭𝐞𝐥𝐞𝐬𝐬 𝐯𝐬. 𝐒𝐭𝐚𝐭𝐞𝐟𝐮𝐥 ➜ Stateless: A stateless system or protocol does not retain any information (state) between transactions. Each transaction is processed based solely on the information that comes with it, without regard to previous interactions. Once…
𝐁𝐞𝐢𝐧𝐠 𝐚 𝐬𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐞𝐧𝐠𝐢𝐧𝐞𝐞𝐫, 𝐚𝐫𝐞 𝐲𝐨𝐮 𝐀𝐈 𝐫𝐞𝐚𝐝𝐲? Today, we're at a turning point where AI isn't just an optional skill—it's becoming essential. At Design Gurus, I've observed firsthand the shift in what companies are looking for in their…
𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄: 𝗛𝗼𝘄 𝘁𝗼 𝗗𝗲𝘀𝗶𝗴𝗻 𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 Let's discuss the design of a photo-sharing service like Instagram. 𝟭. 𝗥𝗲𝗾𝘂𝗶𝗿𝗲𝗺𝗲𝗻𝘁𝘀: Functional requirements: -Users should be able to upload/view photos. -Users can…
𝐖𝐡𝐚𝐭 𝐢𝐬 𝐚𝐧 𝐀𝐏𝐈 𝐆𝐚𝐭𝐞𝐰𝐚𝐲? An API gateway is a type of middleware that sits between a client and a collection of backend services, acting as a reverse proxy. Its main purpose is to route requests from clients to the appropriate microservice and then to return the…
𝐂𝐚𝐜𝐡𝐞 𝐑𝐞𝐚𝐝 𝐒𝐭𝐫𝐚𝐭𝐞𝐠𝐢𝐞𝐬 💠Read Through: In this strategy, when the system requests data, it first checks the cache. If the data is not in the cache (a cache miss), the system retrieves it from the primary storage (e.g., a database), stores a copy in the cache,…
𝟖 𝐌𝐮𝐬𝐭 𝐊𝐧𝐨𝐰 𝐋𝐨𝐚𝐝 𝐁𝐚𝐥𝐚𝐧𝐜𝐢𝐧𝐠 𝐀𝐥𝐠𝐨𝐫𝐢𝐭𝐡𝐦𝐬 1. Round Robin It assigns a request to the first server, then moves to the second, third, and so on, and after reaching the last server, it starts again at the first. 2. Least Connections The Least…
𝐔𝐬𝐢𝐧𝐠 𝐁𝐢𝐠-𝐎 𝐢𝐧 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰𝐬 𝐚𝐧𝐝 𝐄𝐯𝐞𝐫𝐲𝐝𝐚𝐲 𝐋𝐢𝐟𝐞. Big-O notation is a mathematical notation that is used to describe the performance or complexity of an algorithm, specifically how long an algorithm takes to run as the input size grows.…
𝐀𝐥𝐠𝐨𝐫𝐢𝐭𝐡𝐦𝐬 𝐚𝐧𝐝 𝐓𝐡𝐞𝐢𝐫 𝐄𝐯𝐞𝐫𝐲𝐝𝐚𝐲 𝐔𝐬𝐞𝐬 Here are a few algorithmic techniques and their famous uses. 📌 Join my newsletter to learn tips on system design and problem-solving: designgurus.io/newsletter #algorithms #codinginterviews #systemdesign
𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄: 𝗛𝗼𝘄 𝘁𝗼 𝗗𝗲𝘀𝗶𝗴𝗻 𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 Let's discuss the design of a photo-sharing service like Instagram. 📌 Ref: 𝗚𝗿𝗼𝗸𝗸𝗶𝗻𝗴 𝘁𝗵𝗲 𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄 - designgurus.io/course/grokkin… 𝟭.…
System Design - What and Where To Cache? Ref: Ref: designgurus.io/blog/caching-s… #SoftwareDeveloper #technologies
𝐃𝐞𝐬𝐢𝐠𝐧 𝐏𝐚𝐭𝐭𝐞𝐫𝐧𝐬 𝐔𝐬𝐞𝐝 𝐀𝐜𝐫𝐨𝐬𝐬 𝐃𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐭 𝐋𝐚𝐲𝐞𝐫𝐬 1. Client Layer 2. Load Balancer Layer 3. API Gateway Layer 4. Web Server Layer 5. Application Server Layer 6. Caching Layer 7. CDN Layer 8. Database Layer ✅ Ref: Grokking Microservice Design…
𝟏𝟏 𝐃𝐚𝐭𝐚 𝐒𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞𝐬 𝐘𝐎𝐔 𝐌𝐔𝐒𝐓 𝐊𝐍𝐎𝐖 1. Array 2. Queue 3. Tree 4. Matrix 5. Graph 6. Linked List 7. Max Heap 8. Stack 9. Trie 10. HashMap 11. HashSet Post Credit: Nelson Djalo 📍 𝐆𝐫𝐨𝐤𝐤𝐢𝐧𝐠 𝐃𝐚𝐭𝐚 𝐒𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞𝐬 & 𝐀𝐥𝐠𝐨𝐫𝐢𝐭𝐡𝐦𝐬…
𝐖𝐡𝐚𝐭 𝐚𝐫𝐞 𝐒𝐎𝐋𝐈𝐃 𝐝𝐞𝐬𝐢𝐠𝐧 𝐩𝐫𝐢𝐧𝐜𝐢𝐩𝐥𝐞𝐬? SOLID is an acronym that represents five fundamental principles: 1. Single Responsibility Principle (SRP) 2. Open-Closed Principle (OCP) 3. Liskov Substitution Principle (LSP) 4. Interface Segregation Principle (ISP)…
𝐒𝐲𝐬𝐭𝐞𝐦 𝐃𝐞𝐬𝐢𝐠𝐧: 𝐅𝐨𝐫𝐰𝐚𝐫𝐝 𝐏𝐫𝐨𝐱𝐲 𝐯𝐬. 𝐑𝐞𝐯𝐞𝐫𝐬𝐞 𝐏𝐫𝐨𝐱𝐲 Forward Proxy --------------- A forward proxy, also known as a "proxy server," or simply "proxy," is a server that sits in front of one or more client machines and acts as an intermediary…
𝗪𝗵𝗲𝗻 𝘁𝗼 𝘀𝗲𝗹𝗲𝗰𝘁 𝗗𝗲𝘀𝗶𝗴𝗻 𝗣𝗮𝘁𝘁𝗲𝗿𝗻𝐬? Choosing the correct design pattern in software engineering is critical to practical problem-solving. This post will try to simplify the process, helping you decide between patterns based on specific needs. To select a…
𝟏𝟐 𝐌𝐮𝐬𝐭 𝐊𝐧𝐨𝐰 𝐃𝐞𝐬𝐢𝐠𝐧 𝐏𝐚𝐭𝐭𝐞𝐫𝐧𝐬 - Factory - Observer - Singleton - Builder - Adapter - Decorator - Proxy - Strategy - Command - Template - Iterator - State Credit: Nelson Djalo 🔴 𝐆𝐫𝐨𝐤𝐤𝐢𝐧𝐠 𝐃𝐞𝐬𝐢𝐠𝐧 𝐏𝐚𝐭𝐭𝐞𝐫𝐧𝐬 𝐟𝐨𝐫 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐬…
𝐔𝐬𝐢𝐧𝐠 𝐁𝐢𝐠-𝐎 𝐢𝐧 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰𝐬 𝐚𝐧𝐝 𝐄𝐯𝐞𝐫𝐲𝐝𝐚𝐲 𝐋𝐢𝐟𝐞. Big-O notation is a mathematical notation that is used to describe the performance or complexity of an algorithm, specifically how long an algorithm takes to run as the input size grows.…
𝐀 𝐬𝐢𝐦𝐩𝐥𝐞 𝐝𝐞𝐬𝐜𝐫𝐢𝐩𝐭𝐢𝐨𝐧 𝐨𝐟 𝟏𝟒 𝐦𝐮𝐬𝐭 𝐤𝐧𝐨𝐰 𝐜𝐨𝐝𝐢𝐧𝐠 𝐩𝐚𝐭𝐭𝐞𝐫𝐧𝐬. 1. Two Pointers: You use two pointers (like markers or indicators) to traverse an array or list, usually to find a pair of elements that meet certain criteria. The pointers can move…
𝟐𝟓 𝐂𝐨𝐝𝐢𝐧𝐠 𝐏𝐚𝐭𝐭𝐞𝐫𝐧𝐬 𝐭𝐨 𝐜𝐫𝐚𝐜𝐤 𝐅𝐀𝐀𝐍𝐆 𝐂𝐨𝐝𝐢𝐧𝐠 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰𝐬 Two Pointers Pattern: Fast & Slow Pointers Flood Fill Sliding Window Merge Intervals Cyclic Sort In-place Reversal of a Linked List Subsets Modified Binary Search Top 'K' Elements…
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1K Followers 3K Following Malaysian-American • she/her • Travel Advisor • Coding Ninja • Marketing Guru • 🤟🏽🍉10 things about System design you should learn 1. Caching 2. Sharding 3. load-balancing 4. replication 5. fault-tolerance 6. high-avaibility 7. Performance 8. scalability 9. Performance 10. Indexing learn more on Design Guru - bit.ly/3pMiO8g
𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄: 𝗛𝗼𝘄 𝘁𝗼 𝗗𝗲𝘀𝗶𝗴𝗻 𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 Let's discuss the design of a photo-sharing service like Instagram. 𝟭. 𝗥𝗲𝗾𝘂𝗶𝗿𝗲𝗺𝗲𝗻𝘁𝘀: Functional requirements: -Users should be able to upload/view photos. -Users can…
𝟖 𝐌𝐮𝐬𝐭 𝐊𝐧𝐨𝐰 𝐋𝐨𝐚𝐝 𝐁𝐚𝐥𝐚𝐧𝐜𝐢𝐧𝐠 𝐀𝐥𝐠𝐨𝐫𝐢𝐭𝐡𝐦𝐬 1. Round Robin It assigns a request to the first server, then moves to the second, third, and so on, and after reaching the last server, it starts again at the first. 2. Least Connections The Least…
𝐔𝐬𝐢𝐧𝐠 𝐁𝐢𝐠-𝐎 𝐢𝐧 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰𝐬 𝐚𝐧𝐝 𝐄𝐯𝐞𝐫𝐲𝐝𝐚𝐲 𝐋𝐢𝐟𝐞. Big-O notation is a mathematical notation that is used to describe the performance or complexity of an algorithm, specifically how long an algorithm takes to run as the input size grows.…
System Design - What and Where To Cache? Ref: Ref: designgurus.io/blog/caching-s… #SoftwareDeveloper #technologies
𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄: 𝗛𝗼𝘄 𝘁𝗼 𝗗𝗲𝘀𝗶𝗴𝗻 𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 Let's discuss the design of a photo-sharing service like Instagram. 📌 Ref: 𝗚𝗿𝗼𝗸𝗸𝗶𝗻𝗴 𝘁𝗵𝗲 𝗦𝘆𝘀𝘁𝗲𝗺 𝗗𝗲𝘀𝗶𝗴𝗻 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄 - designgurus.io/course/grokkin… 𝟭.…
𝐃𝐞𝐬𝐢𝐠𝐧 𝐏𝐚𝐭𝐭𝐞𝐫𝐧𝐬 𝐔𝐬𝐞𝐝 𝐀𝐜𝐫𝐨𝐬𝐬 𝐃𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐭 𝐋𝐚𝐲𝐞𝐫𝐬 1. Client Layer 2. Load Balancer Layer 3. API Gateway Layer 4. Web Server Layer 5. Application Server Layer 6. Caching Layer 7. CDN Layer 8. Database Layer ✅ Ref: Grokking Microservice Design…
𝐒𝐲𝐬𝐭𝐞𝐦 𝐃𝐞𝐬𝐢𝐠𝐧 𝐌𝐚𝐬𝐭𝐞𝐫 𝐓𝐞𝐦𝐩𝐥𝐚𝐭𝐞 During a system design interview, time is the biggest constraint. Typically, these interviews last for 45 minutes. If you allocate 5 minutes for introductions and Q&A, you are left with 40 minutes to design the system.…
10 things about System design you should learn 1. Caching 2. Sharding 3. load-balancing 4. replication 5. fault-tolerance 6. high-avaibility 7. Performance 8. scalability 9. Performance 10. Indexing learn more on Design Guru - bit.ly/3pMiO8g
Why Is It Hard to Horizontally Scale SQL Databases by @arslan_ah in @gitconnected levelup.gitconnected.com/why-is-it-hard…
Why Is It Hard to Horizontally Scale SQL Databases by @arslan_ah in @gitconnected levelup.gitconnected.com/why-is-it-hard…
10 things about System design you should learn 1. Caching 2. Sharding 3. load-balancing 4. replication 5. fault-tolerance 6. high-avaibility 7. Performance 8. scalability 9. Performance 10. Indexing learn more on Design Guru - bit.ly/3pMiO8g
10 things about System design you should learn 1. Caching 2. Sharding 3. load-balancing 4. replication 5. fault-tolerance 6. high-avaibility 7. Performance 8. scalability 9. API Gateway 10. Indexing learn more on Design Guru - bit.ly/3pMiO8g
Design Patterns Used Across Different Layers 1. Client Layer 2. Load Balancer Layer 3. API Gateway Layer 4. Web Server Layer 5. Application Server Layer 6. Caching Layer 7. CDN Layer 8. Database Layer ✅ Ref: Grokking Microservice Design Patterns - designgurus.io/course/grokkin…
15 people you should follow if you’re interested in System Design: @alexxubyte @hnasr @arpit_bhayani @arslan_ah @sahnlam @systemdesign42 @asmah2107 @ashishps_1 @NikkiSiapno @gkcs_ @arpit20adlakha @ProgressiveCod2 Who else did I miss?
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16 Must-Know System Design Concepts 1. Domain Name System (DNS) 2. Load Balancer 3. API Gateway 4. CDN 5. Forward Proxy vs. Reverse Proxy 6. Caching 7. Data Partitioning 8. Database Replication 9. Distributed Messaging Systems 10. Microservices 11. NoSQL Databases 12. Database…
10 System Design Things Every Developer Should Learn 1. Caching 2. DB Sharding 3. load-balancing 4. replication 5. fault-tolerance 6. high-availability 7. Performance 8. scalability 9. Performance 10. Indexing learn more on DesignGuru - bit.ly/3pMiO8g
10 System design concepts you should learn. 1. Caching 2. Sharding 3. load-balancing 4. replication 5. fault-tolerance 6. high-avaibility 7. Performance 8. scalability 9. Performance 10. Indexing learn more on Design Guru - bit.ly/3pMiO8g
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