The term “backend developer stack” refers to the combination of programming languages, frameworks, libraries, servers, databases, and other technologies used in the development of the server-side of a web application. The choice of stack can greatly influence the performance, scalability, and maintainability of an application. Here are some popular backend stacks:

LAMP Stack

• Linux (Operating System)
• Apache (Web Server)
• MySQL (Database)
• PHP (Programming Language)

MEAN / MERN Stack

• MongoDB (Database)
• Express.js (Backend Framework)
• Angular.js / React.js (Frontend Framework)
• Node.js (Runtime Environment)

Django + Python Stack

• Django (Web Framework)
• Python (Programming Language)
• PostgreSQL (Database)
• Gunicorn / uWSGI (WSGI Server)

Ruby on Rails Stack

• Ruby on Rails (Web Framework)
• Ruby (Programming Language)
• SQLite / PostgreSQL (Database)
• Puma / Unicorn (Web Server)

.NET Stack

• C# (Programming Language)
• .NET Core / ASP.NET (Framework)
• MSSQL (Database)
• IIS (Web Server)

Spring Boot + Java Stack

• Spring Boot (Framework)
• Java / Kotlin (Programming Language)
• MySQL / PostgreSQL / MongoDB (Database)
• Tomcat / Jetty (Web Server)

Serverless Stack

• AWS Lambda / Azure Functions / Google Cloud Functions
• Node.js / Python / Go (Runtime)
• DynamoDB / CosmosDB / Firebase (Database)

These stacks can also be used in various combinations depending on project requirements. Selecting a stack often depends on several factors like team expertise, project needs, and long-term scalability.