PO means the person in charge of a product or business, and the full name is the person in charge of the product, that is, the person who is familiar with the logic, process, setting and other related matters of all business of the product. Generally speaking, this person can be a project manager or a developer who is familiar with business.

PA is the project manager. IT companies often set up a position when recruiting. Project management is a set of technical methods based on recognized management principles. These technologies or methods are used to plan, evaluate and control work activities in order to achieve ideal final results on time, according to budget and according to specifications.

R&D-research and development. Develop r&d engineers

Fe- front-end engineer

Be–Back-end Engineer

QA- Quality Assurance Test Engineer

DBA-–Database Administrator Database

PM- products and services. Marketing product manager

Ts–technical support technical support

Op- operation engineer

User experience User experience designer

Ui–user interface user interface designer