At least for Germany it seems fairly straight forward. You simply need to qualify for a blue card. https://service.berlin.de/dienstleistung/324659/en/

The target salary you need to achieve is € 44k / year.

As described in other comments, once you have found a job your employer will be able to help you take care of the admin topics of getting a visa.

There is no need to speak German and many Berlin based tech companies have English as the official office language (at least in the engineering teams)