Level designer, junior — what do you need (editor, portfolio)?

Question

Game development

A level designer collects levels, probably most often also combines the position of a game designer. It turns out:
1. Which level editor to master? In vacancies on dtf, a unit is mentioned somewhere, somewhere nothing is mentioned at all. For myself, I would take something with lua or a homemade language, such as Python-like gdscript (godot) - C# seems redundantly heavy for scripting. But now we are talking about hired work to make it easier to get a job.
2. Is a portfolio required and of what quality: a level based on some game, or a complete game? Clone or something else? Meaning: How much preparation time should I spend before sending out resumes?
The path is interesting: level designer - game designer - producer. To "below" to feel all the subtleties. There is a near-programmer tower, I work in technical support - probably, such experience is more enough for the position of a tester than no experience for the position of a level designer. This is probably even more "from below". But I read the comments on one of Galenkin's podcasts, and somehow I don't want to be a tester.
Ps. It is interesting to work in the field of casual games, no matter on what platforms.

Answer 1

combines the position of game designer

No.
Here it is better to take Anrialenzhen or Kraienzhn. There are a lot of assets and you can feel the environment art, lighting and so on.
Yes. Maybe just a castle or something.
www.worldofleveldesign.com
You have to feel the level. Scale, dynamics, etc. Look at the cards at the same kolofduti. There is logic, meaning and regularity everywhere.