This is my first pcb design. It is 2 different 4 layer boards with the two inner layers just being full copper GND fills. The device is an interface, 4 buttons and a rotary encoder with a push button, that fits into a Decora single gang box (wall light switch). One board (H3) plugs into the other (H1 or H2) so I can orientate the ethernet port facing either up or down depending on how the wire is fished into the box. The back of the board has the ETH components and the front should have the PoE circuits. I plan on programming it (CN1) to control other devices on the local network using an Olimex ESP-PROG board. Please review and provide me with any feedback. I am planning to send this to jlcpcb for manufacturing and assembly. Thank you in advance for any insights and suggestions.