What level do you consider yourself to be? What criteria do you use?

Defining my level as Middle+, I base it on the following criteria:

• Confident proficiency in PHP and modern frameworks.
• Experience in developing and maintaining complex projects using OOP, design patterns.
• Understanding of application architecture principles, ability to work with databases, caching, queues.
• Ability to independently solve non-standard tasks, optimize code and processes.
• Skills in teamwork, code review, writing tests.

If I can effectively perform these tasks and take responsibility for part of the project, I consider myself a Middle+ specialist.