In its fourth mass recruitment, Tesla wants assembly experts, first-line technicians, marketing experts, quality controllers, safety guards, software engineers, and other factory operation roles as the electric carmaker gets ready for mass production at its Gigafactory 3 in Shanghai by the end of 2019.

As early as when Tesla CEO Elon Musk attended the World Artificial Intelligence Conference in Shanghai this August, he already assured that the jobs his company will be offering in China will have a path to substantial promotion.

Inspiring the best, Musk said that even a junior engineer "could one day be CEO of Tesla worldwide."

On Sept. 1, Tesla started its hiring through its official WeChat account.

Currently, most of those working for Tesla are contractors, but with the target production date about to start in November, the company needs to increase its workers and massive hiring is in full swing.

There are at present, over 200 jobs in Shanghai being offered by the American carmaker in its $2 billion factories.

This Tuesday, it updated its job listing that indicates the factory's firmware team will develop programmable hardware that controls the production line.

Backing up this updated job listing is Musk's tweet that says "Tesla is building a major engineering team in China" that will "focus on software/firmware" both for the "factory & car" adding that "this includes original engineering of new factory processes & cars."

Likewise, the company hopes to use Musk's popularity to tap further into the growing electric car market in China by hiring a strong social media team.

This so-called Creative CP (couple) team will be interacting with fans on multiple platforms.

A sign that mass production will start soon is the company's plans to interview candidates at an upcoming job fair on Thursday.

A job fair for first-technicians and team leaders will be on Sept. 26 at Giga Shanghai.

This team will "assess, deploy and integrate" programmable logic controllers and smart hardware.

Tesla's Shanghai plant is to help the company almost double its production to 500,000 units worldwide.

The company is expecting its first phase trial run in Shanghai to turn out 150,000 Model 3 cars yearly.

Likewise, the company is expecting to "build a second-generation Model 3 line" that it expects to "be at least 50% cheaper," the company said in its earnings report.

This fast pace of recruitment for Giga Shanghai means that preparations for Phase 2 construction are coming along well.

Phase 2 will have the construction of the facility that will make battery packs for Tesla EVs (electric vehicles) and drive units for the company's Model 3.

Tesla Gigafactory 3 passed Chinese government inspection last week, a must before starting production.

Leaked pictures show the company starting part of the production process.