In the dynamic landscape of web development, the selection of an adept Vue developer can be a critical determinant of your project's success or failure. Vue, a JavaScript framework for building user interfaces, prides itself on its progressive nature, meaning it is designed to be incrementally adoptable. While this attribute allows for a high degree of flexibility, it also necessitates a developer with a nuanced understanding of the framework and its potential applications.

So, how do you discern among a sea of self-proclaimed Vue experts to find the proficient developer your project requires? The answer lies in asking the right questions.

Let's delve into the questions that can help you make an informed decision when hiring a Vue developer. But first, let's address the elephant in the room - Why Vue?

There is a myriad of JavaScript frameworks and libraries available today, each with its own strengths and weaknesses. However, Vue stands apart for its simplicity and flexibility. It combines the best aspects of Angular (data binding) and React (component system), making it a robust tool for building anything from small, single-page applications to large-scale enterprise applications.

Moreover, Vue's gentle learning curve is a boon for developers. The framework’s design is intuitive, and it encourages developers to write declaratively, which can make code more readable and maintainable. Thus, a developer proficient in Vue is likely to deliver a cleaner, more efficient codebase.

Now, armed with an understanding of Vue's significance, let's move onto the questions that can assist you in selecting a Vue developer.

1. What is your experience with Vue?
This question will give you an insight into the developer's familiarity and expertise with the framework. An experienced Vue developer will have a broad understanding of the framework's features and its applicability.

2. Can you explain how Vue differs from other JavaScript frameworks like React and Angular?
This question tests a developer's broader understanding of JavaScript frameworks. A well-rounded developer will be able to articulate the respective strengths and weaknesses of these frameworks, and demonstrate why Vue was chosen for a particular project.

3. How would you handle component communication in Vue?
Component communication is an essential aspect of any Vue application. There are several methods of managing this, including props, events, Vuex, and the provide/inject API. A proficient Vue developer should have a strong understanding of these methods and when to use each one.

4. Do you have experience using Vue Router and Vuex?
Vue Router is the official router for Vue.js, and Vuex is the state management library. Both are fundamental to the development of complex Vue applications, and any Vue developer should be proficient in their use.

5. Can you explain Vue’s reactivity system?
This question will test a developer's in-depth understanding of Vue. The reactivity system is a core feature of Vue that automatically updates the DOM when data changes. This is what makes Vue incredibly flexible and efficient.

6. Can you provide examples of projects you've completed using Vue?
An experienced Vue developer should be able to provide a portfolio of projects they've worked on, ideally ones that are similar to your own. These case studies can provide tangible evidence of the developer's proficiency with Vue.

These questions, while not exhaustive, provide a strong foundation from which you can evaluate a Vue developer's expertise and suitability for your project. They probe not only the developer's understanding of the Vue framework but also their practical application of this knowledge.

In conclusion, the process of choosing the right Vue developer for your project is not as daunting as it may initially appear. With a clear understanding of what Vue offers and armed with the right questions, you can successfully navigate this process. Remember, the goal is not only to find a developer who understands Vue but also someone who can leverage its features to the full potential, thereby making your project a resounding success.