PHP 5.6/7/8, OOP, (SOLID,DRY, KISS, YAGNI) patterns, REST,JSON, MVC; Laravel 8( Route, Eloquent,Relationship, QueryBuilder,Migrations, Middleware, Service, Repository, Factories/Seeds, Validation, Request,Recourse,Blade, etc. ) Yii2(ActiveRecord,Migrations,ActiveForm,), Experience in development REST/JSON API.