Some skills may sound rude but this is what I learned and experienced in now ~30 years of being a type of solution provider/problem shooter/dev.

• at least a minimum of soft skills
• should be open minded
• should be willing to learn
• should know how to learn
• be able to ask questions and learn form the answers
• be able to listen to someone else
• should be patient
• should accept that the knowledge can lose its value very quickly
• should take notes for himself
• be curious
• team player to some extent
• develop problem solving skills over the time
• at least a bit patient
• structured approach
• self organisation
• share knowledge and support others
• give feedback and take feedback
• do not take feedback as a personal insult
• be able to communicate with none-devs at least to some extent
• understand where his monthly salary comes from
• don't over engineer - balance between technical perfection and pragmatic solutions
• avoid FOMO
• try to ignore imposter - i still can't manage it after all this time

Consistency in both learning and practice is the most important quality in software development, especially in web development, as emphasized in the MDN documentation being one of the three Cs. These principles are equally applicable to software development, where consistent coding practices and continuous learning are essential for building reliable and maintainable applications