Embedded Linux Kernel & RootFs compiling for Imx6 SBC

I am looking for someone with experience developing Embedded Linux Kernel & Rootfs compiling for an IMX6 SBC. Specifically, I need a custom build of the Linux Kernel and Rootfs for the target platform that will use an Ubuntu-based operating system. I have a specific version of the kernel and rootfs in mind, which I will provide. In addition, I need someone to create custom drivers or modules for the Kernel, as well as optimize its performance or size. The successful candidate should be highly experienced in Linux Kernel and rootfs compiling and development and have previous experience working with the target platform. The Details of the Single Board Computer are as follows:

CPU: i.MX6UltraLite

Architecture: Cortex-A7

Frequency: 528MHz

RAM: 256MB DDR3

ROM: 256MB NandFlash

System: Linux4.1.15+QT5.6

LCD: 4.3" & 7" Resistive Touch Displays.

The SBC and Displays will be made available once the project is allotted.