Help with UI/UX design for a Webapplication

We are developing a web and mobile app and need help with the user interface design / user experience. The development is already done (so all interface elements are available on the page). However, it "does not feel good" to use the application and some elements do not look as good as they should. Difficult to explain. I think we need an expert for ui/ux here, because our team consists of 100% web developers (no creativity). :)

What we expect:
- Experience in designing user interfaces that are not only "good looking", but also are well to use.
- Open for discussion with our team / open to go into multiple cycles / try different solutions.
- IF YOU ARE able to do frontend coding, you might just work with us on the design of the app. Technologies used are VueJS, HTML and LESS. We are also happy to introduce you into our project structure and help you with getting started.
- IF YOU ARE NOT able to do frontend coding, it does not matter. You could deliver different design approaches as pictures. Our staff will then build it into the page. Again: Our major intention is to find a UI/UX/app designer, not a developer.

Oh, and one last thing: As we are getting sooo many automated bids here inside the system, please simply add the word "read_the_description_111" at the end of your bid description. This way we can distinguish between simple automated bids that were made by bots and your real bids. Thanks so much!