Learn Software Engineering with Target Trek
Learn System Design HLD, Java LLD, backend architecture and GenAI with Target Trek ebooks, free resources and real interview experiences.
Learning paths
Technical Books
Comprehensive engineering handbooks that take you from fundamentals to interview-level architecture and implementation.
- System Design HLD
- Java LLD
- GenAI & Agents
Interview Experiences
Explore interview journeys, technical rounds, DSA, low-level design, high-level design, and engineering discussions.
- DSA & Coding
- System Design
- Backend & GenAI
Engineering Resources
Focused learning resources on system architecture, scalability, databases, distributed systems, and backend fundamentals.
- Architecture
- Databases
- Distributed Systems
Engineering Blogs
Understand complex engineering ideas through practical explanations, examples, concepts, and technical articles.
- Development
- Engineering
- Interview Prep
Flagship books
Mastering System Design
Think in systems. Design for scale. Learn to approach system design interviews with clear requirements, APIs, data modeling, scalable architectures, caching, distributed systems, failure handling, and trade-offs.
Mastering System Design
Write better Java. Design better software. Master object-oriented design in Java through OOP, SOLID principles, UML, design patterns, concurrency, locking, and detailed interview-oriented design problems.
Free resources
- Caching – Learn caching strategies, eviction policies, cache invalidation, Redis, TTLs, and distributed cache design.
- Load Balancing – Understand L4 vs L7 load balancing, request routing, health checks, high availability, and traffic distribution.
- Database Design – Explore SQL vs NoSQL, indexes, replication, sharding, consistency, database selection, and scaling strategies.
- Message Queues – Understand asynchronous communication, event-driven systems, queues, consumers, retries, and delivery guarantees.
- Rate Limiting – Learn token bucket, leaky bucket, fixed windows, sliding windows, and distributed API rate limiting.
- API Gateway – Explore API routing, authentication, authorization, throttling, security, and resilient gateway architecture.
Read the blog · Interview experiences · All books
Frequently asked questions
Where should I start learning system design?
Begin with the free caching, load balancing, database, and API gateway resources. When you want complete system-design interview preparation, explore the HLD book.
What's the difference between HLD and LLD?
HLD focuses on scalable architecture, APIs, databases, caching, distributed systems, and system-level trade-offs. LLD focuses on object-oriented modeling, classes, interfaces, UML, design patterns, and Java implementation.
Are the learning resources free?
The resources listed in the Free Engineering Resources section are available through their respective learning pages. The books are separate products; current prices and purchase details are shown on their individual pages.
Can I find software engineering interview experiences?
Yes. The interview experiences section covers preparation and technical rounds across software engineering, backend, low-level design, high-level design, and AI engineering.