Back end is the programming that handles the behind-the-scenes of a website or application that people do not see, such as the server and database. Programming languages such as Python, Ruby, and PHP is used for back-end development.
Learn System Design concepts and prepare for interviews using free resources.
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Apache Lucene open-source search software
Example project showing how to build a Spring Boot App providing a GUI with Vue.js
新项目：快速生成 SQL 和模拟数据的网站（Java 后端），大幅提高开发测试效率！by 程序员鱼皮
Apache Solr open-source search software
Structr is an integrated low-code development and runtime environment that uses a graph database.
Multitenant backend server for building web and mobile apps rapidly. The backend for busy developers. (self-hosted or hosted)
Worker-queue implementation on top of Java and database
韩顺平Java零基础markdown整理（A detailed tutorial of java from 0 to 1）
The modularized backend boilerplate based on Spring Boot Framework, easy to get started and add your business part.
JMeter plugin that lets you send sample results to an ElasticSearch engine to enable live monitoring of load tests.