Git Flow is a workflow methodology for using the Git version control system. It defines a set of guidelines for how to manage branches, releases, and hotfixes in a software development project. The Git Flow approach involves creating separate branches for different stages of development, such as feature development, bug fixing, and release preparation, and using a series of commands to manage the merging and deployment of changes. This helps to ensure that development is organized and efficient, and that changes are properly tested and vetted before being integrated into the master branch.

GraphQL is an open-source data query and manipulation language used for APIs. It provides a standardized way for clients to query, mutate, and subscribe to data, enabling a more efficient and flexible communication between the client and server. It allows clients to request only the specific data they need, reducing the amount of data transfered and improving performance. It is becoming increasingly popular and is used by companies like Facebook, GitHub, and Shopify.

Jest (JavaScript Testing Framework) is a testing framework designed for JavaScript applications, providing a robust environment for writing and executing tests. This skill encompasses the creation of unit tests, integration tests, and snapshot tests to ensure code quality and functionality. Knowledge of Jest is used to facilitate automated testing processes, enabling developers to identify and resolve issues early in the development cycle, thereby improving overall software reliability.

Rspec is a behavior-driven development (BDD) tool for Ruby programmers that allows them to write automated tests for their code. It focuses on describing the expected behavior of code in a clear and concise manner, making it easier to develop high-quality software with fewer bugs. Rspec allows developers to write tests that are easy to understand and maintain, and provides a flexible framework for organizing and running tests. It is widely used in the Ruby community and is considered an essential tool for building reliable and robust applications.

The Serverless Framework is a web framework written using Node.js. Serverless is the first framework developed for building applications on AWS Lambda, a serverless computing platform provided by Amazon as a part of Amazon Web Services. Currently, applications developed with Serverless can be deployed to other function as a service providers, including Microsoft Azure with Azure Functions, IBM Bluemix with IBM Cloud Functions based on Apache OpenWhisk, Google Cloud using Google Cloud Functions, Oracle Cloud using Oracle Fn, Kubeless based on Kubernetes, Spotinst and Webtask by Auth0.