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Back to Backend Engineer
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Phase 8

Low-Level Design

SOLID principles, common design patterns, and domain modeling for backend services.

1

SOLID Principles for Backend Engineers

A practical guide to SOLID principles in Java backend systems, with real order, coupon, and payment examples of each violation and fix.

backend-engineersoliddesign-principles
2

Common Design Patterns for Backend Java Services

Singleton, Factory, Builder, Strategy, Observer, and Decorator in Java with backend use cases: payments, coupons, notifications, and DTOs.

backend-engineerpatternsbuilder
3

Domain Modeling: Entities, Value Objects, and Aggregates

Model order flow, coupons, inventory, and payments as rich domain objects — entities, value objects, aggregates, and avoiding anemic models.

backend-engineerdomain-modelddd
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