During the Galactic Civil War, a secret operative served the Alliance to Restore the Republic as an undercover agent. Sometime following the Battle of Yavin, this operative was given the assignment of discovering a hidden droid factory on the planet of Tatooine. At this factory, the Galactic Empire had been developing a new series of assassin droids poised to cause destruction throughout the galaxy. To gain the skills needed for this mission, the agent infiltrated the Nkik clan of Jawa, learning the craft of droid building under the tutelage of Wimateeka. The Rebel agent needed to equip multiple droids with the necessary abilities to overcome the challenges of various missions, including speech capabilities, arms for manipulating pulleys, and sufficient power to push crates uphill. After completing these training missions, the agent obtained a collection of Optical Information Crystals that revealed the location of the hidden factory. Using a program code reconstructed by combining the information from the crystals, the Rebel droid builder successfully managed to re-program the Imperial assassin droids, turning them into harmless, dancing machines.
In the time of the Galactic Civil War, a small humanoid was a member of the Alliance to Restore the Republic, also known as the Rebel Alliance, a group resisting the ruling Galactic Empire. Despite their young age, this person became a highly trusted secret agent for the Alliance. One day, Alliance Intelligence reported that the Empire had constructed a secret droid factory somewhere on Tatooine, a desert planet in the Arkanis sector scorched by suns. They also discovered that Imperial engineers were creating a new series of assassin droids at that location. Once finished, these dangerous machines were intended to be unleashed to cause chaos in the galaxy. Determined to find this hidden factory and reprogramming the droids, the Alliance leadership entrusted this mission to the small agent.
The agent arrived on Tatooine aboard a CR90 corvette, where they received instructions from C-3PO and R2-D2, a droid duo allied with the Alliance heroes Luke Skywalker and Leia Organa. The agent was instructed to disguise themselves as a Jawa to gain access to the sandcrawler of the Nkik clan with the help of its leader Wimateeka. After learning to build droids with the Jawas, the Rebel was tasked with creating a robot that could infiltrate the Imperial factory and reprogram the new assassin droids. To assist them in that mission, the agent teamed up with C-3PO, R2-D2 and Cammy, a chatty Holocam E-series droid.
With the assistance of their mechanic partners, the agent mastered the art of droid building in Wimateeka's workshop, proving their worth. They subjected newly built droids to a series of tests and maneuvers in the Tatooine wastes, preparing for the actual infiltration mission. As a first step, the Rebel tested their droids in the Sandcrawler Training Facility. In that area, the agent could study their new droids' movement, test their speed or their ability to jump, and check if they were magnetic or not.
Following the preliminary test, the Rebel operative began Wimateeka's first training mission. The wheeled droid had to pass through a security exit door located at the top of the cliff in the Jundland Wastes. To that end, the droid had to put in place a series of movable enclines by activating switches, taking account of its speed and weight to determine the appropriate slope angle. When the inclines were set, there remained a sizeable gap between the top of the slope and the exit door, which the droid was forced to fill by pushing a wooden crate up the incline. The same mission was repeated once more, although with a legged droid, forcing the droid builder to revise their strategy.
In the second test, the agent had to get a droid across two moving conveyor belts that were used to carry crates containing magnetic items. In order to do so, the builder created a droid that was magnetic itself so it could be pulled off the ground by the trams picking up the crates. Againt, that mission was repeated twice with new objectives. On the second round, the builder's droid was tasked with rescuing a stranded R5-series astromech droid that had run out of battery power. In order to help the astromech unit, the agent's droid had to pick up a battery located on the other side of the conveyor belts. On the third occurrence of the mission, the agent had to save another stranded droid that needed to be fully re-powered through a power plug and a generator.
After a number of additional missions where the Rebel agent gained knowledge of droid construction, it became essential to find a program code that could neutralize the assassin droids. To achieve this, the agent needed to retrieve several Imperial Optical Information Crystals and bring them to the Jawa Data Crystal Information Area, where they could be activated using a laser light generator. One of these crystals was stored in the Mos Eisley Salvage Yard, another in the Phrik Mines, and the final one was held by a moisture farmer who supported the Rebel Alliance. While the droid builder had just reconstituted the program code, the Jawas informed them that the Imperial factory had been located in the second quadrant of Tatooine.
Ultimately, the Rebel built their best droid and sent it with a disk containing the program code to the now-known location of the hidden factory. The robot infiltrated the Imperial factory and reprogrammed the assassin droids to dance. Wimateeka was so impressed with his recruit's work that he presented them with an official droid builder certificate.
The droid builder was the playable character in the children's game Star Wars: DroidWorks. The game never specifies the Rebel builder's name or gender, allowing the player to identify themselves with the character. Unlike other game characters—like Rookie One from Star Wars: Rebel Assault or Meetra Surik from Star Wars: Knights of the Old Republic II—the Rebel builder has not been used in later works, so they have never been given a proper canonical identity.
C-3PO comments how the young Rebel looks good as a Jawa, which hints this secret operative might have been a child at the time. This seems to be backed up by the droid builder's diminutive height.