Web App UI Redesign

I need a complete visual overhaul of my Graphic Design-focused web application. The goal is to replace the current, dated interface with a clean, intuitive UI that feels modern and speeds up the creative flow for users. The application is an accounting software.

You’ll be working on a web platform only—no mobile or desktop software versions—so every screen, component and interaction should be optimised for the browser, with responsiveness in mind for common breakpoints.

Here’s what I’d like to receive:
• High-fidelity mock-up for the one (!) of the attached screens
• Source files in Figma ready for hand-off to developers
• A short style-guide document describing your design decisions.

Be aware, this is a contest to find a skilled graphic designer for a long term cooperation. We will implement the new design step by step. With this contest we're trying to find a designer that matches our current look and feel whilst being able to keep the software visually modern and up to date.