[corecoder]

As you move from country to country, employment laws and tax laws change as well.

Your employment contract will probably be illegal in some countries, and this could cause legal troubles for both you and your employer.

Depending on how much time you spend in a country (and this threshold may vary from country to country), you may be required to pay taxes there. This could as well affect the employer, who may also be required to pay part of your taxes.

I'm not saying that it's impossible, just really really hard, both you and the employer would need to hire an expert on taxes and labor law for each country you go to.

[matwood]

Exactly. What I've seen done when people really want to work outside the country is they are given the option to quit and become a contractor. That puts most of the risk on the employee to handle the country specific regulations, along with all the other contractor type risk (and benefits).

[tremon]

(and this threshold may vary from country to country)

To be more specific: this depends on treaties between the country of residence and the country of employment, so it can vary for every combination of countries. It may even mean that taxes are due in both countries (double taxation), and getting a tax waiver in one of them may require legal proceedings and/or expensive accountants.

[Bouncingsoul1]

It may even depend how close you are to the border. E.g. between germany-austria-swiss, you have grenzgänger status if you are within 30 km of the closets border, which may influence your social/ healthinsurance and your income tax