Wat is Arduino?
Arduino is an open-source electronics platform based on easy-to-use hardware and software. Arduino boards are able to read input: for example light on a sensor, a finger on a button, or a Twitter message; and then converting it into an output: activating a motor, turning on an LED, publishing something online. You can tell your board what to do by sending a series of instructions to the microcontroller on the board. Arduinos are often super modular, which makes them very "Plug and Play". This allows you to create handy machines relatively quickly. Arduinos run the Arduino programming language (based on Wiring), which is written in the Arduino Software IDE (based on Processing).
What does a Arduino developer do?
An Arduino developer is able to program microcontrollers to perform a variety of tasks. For example, think of a laser that counts how many products have passed on a treadmill. With Arduino, a developer can relatively easily realize a prototype. After the prototype has been validated a real printed circuit board (PCB) can be made. This enables organizations to reduce time to market and lower the cost for the development of embedded devices.