You are either an engineer or a hobbyist who experiments with lots of mechanical tools and wires. You have used your accumulated knoweldge to learn how to build various tools and put them together.
Tool Master
You have a knack for knowing how tools work. At 3rd level, you are proficient with all tools..
Extreme Machine
Starting at 3rd level, you can modify a weapon or a piece of armor on the fly. You spend 10 minutes to make the necessary modifications to the device. For the next hour, the weapon or armor gains one modification (see Equipment). At the end of the hour, or when a natural 1 is rolled while using the device, the modification ceases to function. At 15th level, you can add up to two modifications to the armor or weapon.
Once you have used this ability, you cannot use it again until you have finished a short or long rest.
Jury-Rig
Beginning at 7th level, you have advantage on ability checks to make temporary or jury-rigged repairs.
Build Drone
At 10th level, you can build a drone to aid in your tasks. The drone takes 8 hours to build. The drone is tiny and has an AC of 13 and 30 hit points. It is equipped with wheels that give it a base speed of 20 feet, and rotors that grant it a flight speed of 30 feet and the ability to hover.
The drone has a crude manipulator arm that allows it to interact with objects in the environment, but it is incapable of fine manipulation, such as picking a lock or typing a message. It can carry up to 50 pounds while on land and 20 pounds while flying. It is equipped with audio and visual sensors that allow you to see in an adjustable 90 degree arc and hear audible sounds within 30 feet of the drone. You can make Intelligence (Investigation) and Wisdom (Perception) checks through these sensors.
The drone is remotely controlled by you. As an action or bonus action, you can command the robot to move up to its speed. Performing any task other than Intelligence (Investigation) or Wisdom (Perception) checks require an action. You can only have one drone active at a time.
Legendary Craftsmanship
At 18th level, when you create a mechanical or electronic device from scratch, you do so in only one quarter of the time normally required.