Just to help you use him efficiently...
The tinkerer is strongest when placed at outposts with high shield count. Those would be where a queen, king, or security chief is, since they all increase shield capacity at that specific outpost. However, the tinkerer does reduce that shield, SO you'll need to make sure you've got the outpost protected with drillers if it could potentially be attacked.
Another good use of tinkerers is stacking them. If you have 1 tinkerer at an outpost, after a short period of time the shield will be completely drained. Putting another tinkerer on that same outpost won't harm the shield drain (you can't get any lower than 0, can you? negative numbers don't count) but you'll still get the 3x added onto your driller cap.
Hope that helped!
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