PKPrathamesh Karatkarinprathameshkaratkar.hashnode.dev·Oct 6 · 8 min readDesigning a Public Payment API: Charges, Refunds, Disputes, Idempotency and Rate LimitsA production-style design that combines REST API design, idempotency, versioning, pagination, API gateways, rate limiting, Redis, retries, RabbitMQ and webhooks. After two days of studying API desig00
PKPrathamesh Karatkarinprathameshkaratkar.hashnode.dev·Oct 4 · 18 min readGateways & Rate Limiting Explained: API Gateway, BFF, Service Mesh, Redis, Retries and TimeoutsSystem Design Series, Part 2. In Part 1 we covered API design: REST, idempotency, versioning, pagination and status codes. This part covers what sits in front of your services and how they survive fai00
PKPrathamesh Karatkarinprathameshkaratkar.hashnode.dev·Oct 3 · 16 min readAPI Design Explained: REST, Idempotency, Versioning, Pagination and Status CodesIntroduction Good API design comes down to one idea: your system should behave predictably even when the network does not. Requests get lost, clients retry, and old apps keep calling endpoints you hav00
PKPrathamesh Karatkarinprathameshkaratkar.hashnode.dev·Jun 4, 2025 · 13 min readUnderstanding Interfaces in Java: A Comprehensive Guide to Their Types and UsageAn interface in Java is a blueprint of a class that defines a set of abstract methods, constants, and (since Java 8) default and static methods. It serves as a contract, specifying behaviors that implementing classes must provide. Interfaces are decl...00
PKPrathamesh Karatkarinprathameshkaratkar.hashnode.dev·Jun 4, 2025 · 11 min readInheritance, Polymorphism, and Abstraction: The Pillars of Object-Oriented Programming in JavaObject-oriented programming (OOP) is a powerful programming paradigm that organizes code around objects—entities that combine data (attributes) and behavior (methods). At the heart of OOP in Java are three fundamental concepts: inheritance, polymorph...00
