Upgrade Nuxt 3 to Nuxt 4

I'm seeking an experienced developer to upgrade our headless frontend code from Nuxt 3 to Nuxt 4. The current setup connects to Strapi 3. It's important to maintain all current functionalities without any changes.

Requirements:
- Upgrade Nuxt 3 to Nuxt 4
- Maintain existing functionalities
- No custom plugins or modules

Ideal Skills:
- Strong experience with Nuxt.js
- Familiarity with Strapi
- Proven track record of similar upgrades

Please provide examples of previous work and estimated time for completion.