Moving Marked Object Pick Up Robot Arm on a Track

Looking for freelancer who can prototype a small working version of marked moving object pickup Robot Arm [This could be considered as Toy Robot, which we can buy on-line for around $ 40-60]. In real world the Arm should be capable to pick up 5-10 kg weight object by its handle, handles are marked with X sign or say specific color. Handles are always positioned to be picked up by Robot Arm, but they are moving linearly very slowly, just need to identify them by X mark or color. It should reject or ignore other handle objects and carry that object to up to 10-12 ft distance and drop there gently. The Robot Arms will be hanging on the circular Rail Track on the roof, which is either stationary or moving and based on that the Arm should move on track. The Arm should be programmed to repeat the task automatically. One switched on, its function is continuously look for moving marked objects, pick them at one end and drop at the other end and come back on the circular track, on which he travels. Track is shown in attached pic. Robot is mounted on outer side of the grooved track and travels in one direction as shown by arrows. About speed, it should be configurable from 0.001 m/s to 1 m/s. We don't need GUI for now. But the ability to modify the configurations every now and then by re-uploading the program to the Robot. Submit quote for Smallest Toy Version Prototype or if you still need more info, let me know. I'm open about the Technology/Software you use but would be good, if you can use Arduino or Raspberry Pi, C, Python etc.