Awesome GitHub RepositoriesBackend Data Access Layers

Agent-skills is a collection of structured instructions and behavioral personas designed to standardize how AI coding agents perform engineering tasks. It functions as a workflow orchestrator that maps natural language intent to repeatable technical sequences and verification checklists. The project distinguishes itself through the use of specialized markdown-defined roles, such as security auditors or test engineers, to apply targeted domain expertise. It employs an evidence-based verification model that requires runtime data or passing tests as mandatory exit criteria to ensure AI-generated

Spring Framework is an enterprise Java framework providing a comprehensive infrastructure for building server-side applications. It functions as a dependency injection container and a Java application framework designed to support scalable backend development through modular architecture. The project provides tools for aspect-oriented programming to intercept method calls using dynamic proxies, allowing the application of cross-cutting concerns such as security and transactions. It also includes a centralized system for managing object lifecycles and coordinating component wiring by injecting

This project is a collection of reference implementations demonstrating recommended patterns for organizing code and managing data flow in Android applications. It provides structural examples of layered architecture, separating code into presentation, domain, and data layers to decouple business logic from data sources. The repository includes specific samples for implementing declarative user interfaces that automatically update their visual state based on underlying data changes. It further demonstrates how to manage object lifetimes and component dependencies to reduce boilerplate and sim

This project is an ASP.NET Core solution template and boilerplate that implements a clean architecture pattern for building enterprise applications and web API backends. It provides a standardized project scaffold designed to separate business logic from infrastructure and user interfaces to ensure high testability and low coupling. The project features a database agnostic structure that allows for switching persistence providers without altering core business logic. It includes a command line tool for enterprise application bootstrapping, enabling the automated generation of project structur

This is a reference implementation of Uncle Bob's clean architecture for Android, structured into distinct domain, data, and presentation layers. The project demonstrates how to organize an Android application around business use cases, keeping domain logic and entities free from framework dependencies. The architecture enforces dependency inversion through layered separation, where inner domain layers define interfaces that outer layers implement. This approach enables repository abstractions for data source switching, presenter-view separation for testable UI logic, and use-case composition

This project is a database driver and interface for the Go programming language, specifically designed for PostgreSQL. It provides a low-level library for executing SQL queries, managing transactions, and handling data persistence within Go applications. The driver distinguishes itself by implementing the native PostgreSQL binary wire protocol, which minimizes communication overhead and maximizes data transfer efficiency. It includes advanced connection pooling to maintain persistent database sessions and supports prepared statement caching to accelerate the execution of frequently repeated o

eShopOnWeb is a reference application for ASP.NET Core that demonstrates a sample e-commerce site. It serves as a template for building scalable services using domain-driven design to separate business logic from infrastructure and data access. The project implements a decoupled messaging pattern through a request pipeline to separate web controllers from application logic. It utilizes a repository pattern to abstract data persistence and isolate the core application logic from the specific database storage mechanism. The application covers a broad surface of web capabilities, including user

Doctrine ORM is a PHP object-relational mapper that connects application objects to relational database tables. It uses the data mapper and identity map patterns to decouple the in-memory object model from the database schema, allowing developers to manage data persistence without writing manual SQL. The project features a dedicated object-oriented query language and programmatic builder for retrieving data based on entities rather than tables. It implements a unit-of-work system to track object changes during a request and synchronize them via atomic transactions. The capability surface inc

This project is a boilerplate and template for Go applications implementing Clean Architecture. It provides a standardized project structure designed to organize code into decoupled layers, ensuring that core business logic remains independent of databases, frameworks, and user interfaces. The implementation focuses on a domain-driven design that utilizes dependency injection and the repository pattern to abstract data storage. It enforces architectural boundaries through internal package encapsulation and layer-based dependency inversion. The project includes a development toolchain that au

This project is a reference implementation of the Model-View-ViewModel pattern using Android Jetpack components. It serves as an architecture template and layering guide, dividing application code into view, domain, and data layers to ensure a unidirectional flow of dependencies. The implementation focuses on state management and configuration change handling. It demonstrates how to synchronize UI updates across multiple screens using shared state containers and preserves application state during transitions between portrait and landscape orientations. The codebase covers a broad surface of

This project is a comprehensive knowledge base and study resource designed for mastering technical interviews. It provides structured guides, roadmaps, and curricula focused on data structures, algorithms, system design, and frontend engineering to help candidates prepare for software engineering screenings. The repository distinguishes itself by offering a holistic approach to professional advancement. Beyond technical drills, it includes a career development handbook covering resume optimization, salary benchmarking, and strategic negotiation coaching. It also provides detailed methodologie

Graphene is a library and framework for building type-safe GraphQL APIs and schemas using Python objects and resolvers. It provides a system for mapping internal data models to typed GraphQL schemas, enabling the creation of servers that process queries and execute resolvers to return structured data. The project includes a full implementation of the Relay specification, providing standardized patterns for global object identification and cursor-based pagination. It utilizes a class-based approach to schema definition and supports interface-based type inheritance. The framework covers a broa

Tivi is a cross-platform application for discovering and tracking television shows, built with Kotlin Multiplatform and Compose Multiplatform to share its user interface across Android, iOS, and desktop platforms. The app follows the Model-View-Intent (MVI) architecture pattern, where user actions are modelled as sealed class intents that reduce into a single immutable state object, ensuring predictable and unidirectional data flow managed through Kotlin coroutines and StateFlow. The application uses Hilt for compile-time dependency injection and SQLDelight for type-safe local data storage, c

This project is a PHP library for implementing a spec-compliant OAuth 2.0 authorization server. It serves as an authentication framework for managing user identities and client authorizations, providing the necessary components to issue and validate access and refresh tokens. The server supports a wide range of standardized authorization flows, including authorization code exchange, device grants, implicit flows, and PKCE enforcement. It handles complex token lifecycles through refresh token rotation, scope management, and the use of asymmetric keys for signing digital tokens. The system pro

This project is a TypeScript-based private API SDK and automation framework for Instagram. It serves as a server-side toolkit for NodeJS that interfaces with undocumented API endpoints to programmatically manage profiles and automate account operations. The library focuses on mimicking authentic user behavior by simulating mobile application network traffic patterns and headers. It uses stateful session management to maintain authentication tokens and employs a sequence-based coordination model to execute complex workflows, such as multi-step media uploads. The framework covers several high-

Hanami is a full-stack Ruby web framework and API platform designed for building maintainable applications. It centers on a modular web architecture that organizes software into independent slices to prevent monolithic growth and isolate functional units. The framework implements a clean architecture by decoupling business logic from persistence and request handling. This is achieved through a central dependency injection container for managing object lifetimes and a repository pattern mapper that separates domain entities from the persistence layer. The project further provides a Rack-compa

Dieses Projekt ist eine Referenzimplementierung von Domain-Driven-Design-Mustern, funktionaler Domänenmodellierung und ereignisgesteuerter Zustands-Koordination. Es demonstriert die Anwendung strategischer und taktischer Entwurfsmuster zur Verwaltung komplexer Geschäftsanforderungen. Die Implementierung nutzt ein funktionales Domänenmodell mit reinen Funktionen und unveränderlichen Objekten zur Verwaltung von Zustandsübergängen und Seiteneffekten. Sie bietet eine Command-Query-Responsibility-Segregation-Architektur zur Trennung von Lese- und Schreibmodellen, neben ereignisgesteuerter Koordination zur Wahrung der Konsistenz über autonome Geschäftsgrenzen hinweg. Die Codebasis integriert eine modulare Monolithen-Architektur unter Verwendung von Bounded Contexts und hexagonalem Layering, um Kernlogik von der Infrastruktur zu isolieren. Die Qualitätssicherung erfolgt durch eine Suite für verhaltensgesteuerte Entwicklung (BDD), die die Ubiquitous Language widerspiegelt, um Geschäftsszenarien zu verifizieren, sowie automatisierte Tests, die architektonische Constraints durchsetzen. Das Projekt wendet diese Muster auf eine Bibliotheksverwaltungsdomäne an und deckt Katalogpflege, Ausleih-Workflows, Reservierungsvalidierungen und die Nachverfolgung überfälliger Rückgaben ab.

Dieses Projekt ist eine Referenzimplementierung, die eine Sammlung praktischer Beispiele für Datenzugriffsmuster und Repository-Abstraktionen innerhalb des Spring-Data-Ökosystems bereitstellt. Es dient als umfassendes Showcase für die Implementierung konsistenter Datenschichten über verschiedene relationale und nicht-relationale Datenbanken hinweg. Das Repository demonstriert spezifisch Multi-Store-Persistenz durch die Integration relationaler, Dokumenten- und Vektordatenbanken innerhalb einer einzigen Anwendung. Es enthält Implementierungen für Vektorsuche zur Verwaltung hochdimensionaler Embeddings und Ähnlichkeitssuchen über verschiedene Datenbanktechnologien hinweg. Zusätzliche abgedeckte Funktionen umfassen reaktiven Datenzugriff für nicht-blockierende Operationen und asynchrone Datenströme. Das Projekt bietet zudem Anleitungen zur Optimierung nativer Images, um die Start-Performance und den Speicherverbrauch durch Ahead-of-Time-Kompilierung zu verbessern. Die Beispiele illustrieren darüber hinaus Multi-Tenant-Datenisolierung, das Design von Daten-Repository-APIs sowie die Integration von Geodaten- und Volltextsuche.

Dieses Projekt ist eine Referenzimplementierung und ein architektonisches Beispiel für Domain-Driven Design (DDD). Es dient als Codebasis, die demonstriert, wie Software-Design an einer spezifischen Geschäftsdomäne ausgerichtet wird, um komplexe Geschäftslogik zu verwalten. Die Implementierung fungiert als Berichtssystem, das Daten über JSON-Payloads empfängt und verarbeitet. Es nutzt ein strukturiertes Domänenmodell, um Geschäftsabläufe zu definieren und zu automatisieren sowie Zustandsänderungen zu verarbeiten. Die Architektur unterteilt das System in separate Anwendungs- und Domänenebenen, wobei Aggregate Roots für Konsistenz und das Repository-Pattern für den Datenzugriff genutzt werden. Anwendungsservices koordinieren Aufgaben und delegieren Logik an Domänenobjekte, um die technische Infrastruktur von den Geschäftsregeln zu trennen.

LoopBack Next is a Node.js API framework used for building REST and multi-protocol APIs. It functions as an OpenAPI server implementation that can either generate machine-readable specifications from code or produce implementation controllers and models from existing specifications. The framework distinguishes itself through a central dependency injection container and a repository-pattern data access layer. This architecture decouples application logic from component construction and persistent storage, allowing for a pluggable system where data sources and business logic are isolated throug