Design of Flashing LED Driver Board

I want a Flashing LED driver circuit ushing Linear constant current LED Driver Part No BCR421UW6-7.

(1) The input to the driver circuit can be anything between 15V to 35V DC.
(2) There will be six LED driver ICs part No BCR421UW6-7.
(3) Each LED driver will produce 350mA current to drive a string of 4 LEDs (forward voltage 3.1V) connected in series.
(4) There will be a mechanism (using a 555 timer) to enable the LED drivers ON-OFF at rate of 50 pulses per minute.
(5) Input Reverse polarity protection shall be provided using a Diode on the Positive supply pin.

The freelancer shall:
(1) Design the schematic.
(2) Generate the PCB with proper vias and other mechanisms for thermal management (as drivers will generate lot of heat).
(3) Deliver: (i) Schematic, (ii) gerber, (iii) BOM

Payment terms:
(1) 15% on Schematic
(2) 25% on Gerber and BOM
(3) 60% on successful testing of board.

Freelancer Attributes:
- Ideal candidates should have experience in electronic design specifically focused on LED technology.
- Precise skill set required includes knowledge of simulation, schematic and PCB gerber generation.
- Adequate thermal management skills in the PCB is a must.