C++ UX/UI graphics programmer for Desktop Application using IMGUI

We are looking for someone who can develop a front-end UX/UI using IMGUI with OpenGL for our desktop application. This image attached/provided are the details of the project. The final result must be pixel perfect!

Tools we use:
Slack (for communication)
Toggl (for time tracking/forecasting, even for fixed projects)
GitHub (for the repository)

The goal here is to determine your skillset and expertise, and if all work meets our requirements, we would like to work with you on many more panels in the future. Future panels would be much more complicated, including keyframers, project trees, etc.

If you download the free version of Spine from esoteric software, you will get a better idea of the UX/UI complexity we require. http://esotericsoftware.com/spine-download Please do not apply if you feel that you could not rebuild the UX/UI that you see in Spine.

Take careful attention to the details of this project, and the time you think it would take.

Requirements:
C++17 experience
Real-time programming

Bonus:
IMGUI experience
OpenGL

Timeline for completion 1-2 weeks (Calendar Time).

Contract:
Part 1: $750.00 USD (All features complete, First Draft)
Part 2: $500.00 USD (Total Integration, Refactoring, Changes)

Total Contract: $1,250.00 USD