Hi,
Undergone the posted project scope and understand you are looking for a skilled senior WordPress expert who can work independently, fast and update website or any online product online.
Though, we are a company and all our professionals are of senior level as they have 5 to 15+ years of hand on experience. We would be happy to provide you a skilled and experienced WordPress developer to work full time on your projects and also has all the qualities you have listed.
1.) The most important is that an agency can't drop the project in between or can't get vanished as mostly freelancer do when they find the project is out of their scope.
2.) You can access plenty of skills, tech stack, etc
3.) You are back-ed up by other senior developers and same level of colleagues, in case if the recruited developer is unable to up due to any reason.
4.) Multiple minds to resolve the situation if project stuck due to any reason.
5.) In-house team of designers, developers, QA, etc.
And, many more other benefits.
Hope my points make some sense and expect to see your reply and to work with you.
Thanks & Regards.