WordPress Website Upgrade Developer

I need to take my existing WordPress-based site to the next level. The core structure is already in place, but the theme, plug-ins, and overall performance are showing their age, and a few new features are overdue. Everything sits on standard WordPress with the usual mix of HTML, CSS, and a little custom PHP in the background, so deep familiarity with that stack will help you move quickly.

Here’s what I want to walk away with:
• A fully updated WordPress core, theme, and plug-ins, implemented safely on a staging copy first
• Clean, modern front-end styling that keeps branding intact while improving load speed and accessibility
• Any legacy PHP snippets refactored so they follow current best practices and don’t break on future updates
• Thorough testing and a smooth push from staging to production, with no downtime for end-users

I’ll provide admin access to the existing hosting environment and all brand assets as soon as we kick off. Please let me know how you plan to approach the upgrade, what tools you rely on for version control and backups, and a realistic timeline for each milestone so we can keep the project moving smoothly.
Im looking for someone that can handle all my seo related, development, blogs., digital marketing, wordpress seo and more. I need someone that has very good ideas, rather Then targeting money. That can come later. I need someone that's trustworthy and honest for long term relationship .