100 Days of System Design - A Complete MindMap

Last Updated : 23 Jul, 2025

"Are you looking for the best way to learn system design in just 100 days? "

"Do you want to effectively prepare for System Design Interviews and master the key concepts and techniques? "

If so, you're in the right place. This comprehensive guide is designed to take you through a structured 100-day plan, helping you build a strong system design foundation and confidently prepare for interviews.

System design is a critical skill for software engineers, creating scalable and efficient systems that meet user requirements. Whether you're a beginner or an experienced professional, this 100-day plan will guide you step-by-step through the essentials of system design. By the end of this journey, you'll be equipped with the knowledge and skills needed to tackle complex design problems and excel in your career.

In this guide, you'll find detailed lessons on various aspects of system design, from understanding the basics and key differences to exploring high-level and low-level design, database selection, scaling techniques, performance optimization, and much more. Each week is carefully structured to build on the previous one, ensuring a smooth learning curve.

Structure of the 100-Day Mindmap of System Design

This comprehensive 100-day plan is designed to provide a thorough understanding of system design, preparing you for technical interviews and real-world applications. The plan is divided into weeks, with each week focusing on specific topics and concepts to build a solid foundation in system design. Here’s a brief overview of how the plan is structured:

Table of Content

100-Days-of-System-Design

Phase 1: Introduction to System Design

Days 1-2: Understanding System Design

This period focuses on defining system design and its importance. You'll get an overview of what system design entails and why it's a critical aspect of software engineering.

Days 3-4: Key Differences in System Design

These days are dedicated to understanding the distinctions between related concepts such as system design, system analysis, system architecture, and system development. This foundational knowledge is essential for grasping more advanced topics.

Days 5-7: System Design Fundamentals

This section covers the basic strategies and life cycle stages of system design. You'll learn about different approaches and the overall process from requirement gathering to system maintenance.

Phase 2: Requirements and Components

Days 8-9: Requirements in System Design

Focus on the types of requirements in system design, specifically functional and non-functional requirements. Understanding these is crucial for creating systems that meet user needs and performance expectations.

Days 10-11: Structured Analysis and Design

These days delve into structured analysis and design methodologies. You'll explore how these techniques help in breaking down complex systems into manageable components.

Phase 3: Analysis and Design Techniques

Days 12-14: Object-Oriented Analysis and Design (OOAD)

Focus on object-oriented analysis and design techniques, which are essential for building modular and reusable systems. You’ll compare these with structured analysis methods.

Days 15-18: Diagrams in System Design

These days are dedicated to learning about various UML diagrams such as class diagrams, object diagrams, package diagrams, state machine diagrams, and activity diagrams. These visual tools are crucial for documenting and communicating design ideas.

Phase 4: Database Design

Days 19-21: Database Selection and Storage Systems

Learn about different types of databases (SQL vs NoSQL) and storage systems (file, block, object storage). This knowledge helps in choosing the right database and storage solutions for your system.

Days 22-25: Advanced Storage Concepts like Database Sharding and Replication

This period covers advanced concepts like database sharding, replication, and normalization processes. Understanding these will help in designing scalable and efficient databases.

Focus specifically on the techniques of database sharding and replication, which are critical for managing large-scale databases.

Days 26-29: Database Optimization Techniques

Learn about the processes of normalization and denormalization in databases. These concepts are essential for optimizing database performance and storage efficiency.

Days 30-33: Data Partitioning and Indexing

Explore data partitioning techniques and indexing, which are key for improving database performance and managing large datasets.

Phase 5: High-Level Design (HLD)

Days 34-35: High-Level Design Concepts

Understand the principles and objectives of high-level design (HLD) in system architecture.

Days 36-37: High-Level Design Strategies

Explore strategies for creating scalable and adaptable systems.

Days 38-39: High-Level Design and Availability

Learn about the importance of high-level design and techniques to ensure system availability. This includes understanding design strategies to enhance system uptime.

Days 40-42: High-Level Design Case Studies

Analyze real-world case studies of high-level design implementations.

  • High-Level Design Case Studies
  • Case Studies in System Architecture

Phase 6: Low-Level Design (LLD)

Days 43-44: Low-Level Design Fundamentals

Learn principles and practices of low-level design (LLD) at a detailed component level.

Days 45-46: LLD Techniques and Patterns

Explore techniques and design patterns for optimizing performance and scalability.

  • Design Patterns in LLD
  • Techniques for Optimizing LLD

Days 47-49: LLD Case Studies

Study case studies illustrating effective low-level design practices.

  • LLD Case Studies
  • Real-World LLD Examples

Phase 7: Scaling and Performance

Days 50-51: Scaling Techniques

Understand horizontal and vertical scaling methods. Learn which scalability approaches are suitable for different applications.

Days 52-54: Performance Optimization

Focus on identifying and addressing primary bottlenecks in system performance. Topics include latency, throughput, and overall system efficiency.

Phase 8: Reliability and CAP Theorem

Days 55-56: Ensuring Reliability

Explore methods to ensure system reliability, a crucial aspect of system design that affects user trust and system robustness.

Days 57-59: CAP Theorem and Consistency Models

Understand the CAP theorem and different consistency models. Learn how to balance consistency, availability, and partition tolerance in distributed systems.

Days 60-62: Advanced Reliability Techniques

Focus on advanced techniques for ensuring reliability, including redundancy and consistent hashing. These concepts are essential for fault-tolerant systems.

Phase 9: Networking and Load Balancing

Days 63-64: Load Balancing Strategies

Learn about load balancers and strategies for distributing network traffic to ensure system efficiency and reliability.

Days 65-66: Content Delivery Networks and Communication Protocols

Explore content delivery networks (CDNs) and communication protocols, which are key for optimizing data delivery and network communication.

Days 67-68: Network Protocols and UML

Study network protocols and the Unified Modeling Language (UML) for documenting system architectures. These tools are essential for effective system design communication.

Days 69-70: Web Servers and Proxies

Focus on the role of web servers and proxies in system design. Learn how they contribute to system performance and security.

Phase 10: Caching and Queues

Days 71-73: Caching Strategies

Understand caching mechanisms and cache eviction policies. Caching is crucial for improving system performance and reducing latency.

Days 74-76: Message Queues

Learn about message queues and distributed messaging systems, which are essential for building scalable and reliable distributed systems.

Phase 11: Security and Testing

Days 77-78: Security Concepts

Focus on security concepts, including the differences between authentication and authorization, and the importance of data encryption.

Days 79-80: Security Measures and Unit Testing

Learn about essential security measures and the basics of unit testing, which are critical for building secure and reliable systems.

Days 81-82: Integration Testing and CI/CD

Explore integration testing and continuous integration/continuous delivery (CI/CD) practices. These ensure that system components work together seamlessly and updates are delivered reliably.

Days 83-84: Security Testing

Focus on security testing methodologies to identify and mitigate vulnerabilities in your system design.

Phase 12: Design Patterns and Optimization

Days 85-87: Design Patterns and Optimization Techniques

Learn about common design patterns and optimization techniques. These are essential for creating efficient, reusable, and maintainable system designs.

Days 88-90: Data Structures and Algorithms

Study data structures and algorithms specifically relevant to system design. This knowledge is crucial for solving complex design problems

Days 91-92: Modularity and Quality Assurance

Explore modularity and interfaces in system design, along with software quality assurance practices to ensure system reliability and performance.

Phase 13: Case Studies

Days 93-95: System Design Case Studies

Study real-world system design case studies such as URL shortening services, Dropbox, and Twitter. Understand the architecture and design choices made in these systems.

Study the design of messaging platforms like WhatsApp and Instagram. Understand the unique design requirements and solutions for these systems.

Days 96-98: Advanced Case Studies

Delve into more complex case studies like Netflix, Uber, and BookMyShow. Learn about the complete architecture and design decisions behind these systems.

Phase 14: Final Review and Assessment

Days 99-100: Review and Catch-Up

Review all the topics covered over the 100 days. This period is for revising key concepts, catching up on missed topics, and preparing for final assessments or interviews.

  • Review and Catch-up

Resources and Tips For Interview Preparation

1. System Design Interview Questions.

Prepare for system design interviews by reviewing common questions and problems. Practice answers to build confidence and proficiency.

2. Interview Tips and Strategies

Learn tips and strategies for successfully navigating system design interviews, including how to approach different types of questions and problems.

3. Low-Level Design Interviews

Focus on low-level design interview preparation, including common concepts and problem-solving techniques.

If you prefer learning through video tutorials and structured courses, we have the perfect solution for you! Mastering System Design: From Low-Level to High-Level Solutions is a comprehensive course that dives deep into system design, offering you a detailed and practical learning experience. Whether you're looking to understand the fundamentals or master advanced concepts, this course has everything you need to become proficient in system design.

Conclusion

In conclusion, mastering system design is crucial for any software engineer aiming to build scalable and efficient systems. Throughout this structured 100-day plan, we've covered essential topics from understanding system design fundamentals to advanced techniques in high-level and low-level design, database selection, scaling, performance optimization, and more. By following this comprehensive guide, you'll not only gain a solid foundation in system design but also prepare effectively for technical interviews and real-world applications. Embrace this journey to equip yourself with the skills and knowledge needed to excel in your career as a software engineer.

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