Target Trek Blog

Explore practical software engineering articles covering system design, backend development, Java, GenAI, APIs, databases, scalability and interview preparation.

• Understanding Payment Idempotency Keys: Prevent Duplicate Transactions Safely

  Learn how idempotency keys work in payment systems to prevent duplicate transactions, understand HTTP method idempotency, and get practical backend implementation guidance.

• SOLID Principles in Java: Complete Guide for Low-Level Design Interviews

  Learn all five SOLID principles in Java with practical examples, diagrams, Spring Boot use cases, common interview questions, and real Low-Level Design applications.