Is the Jucheng platform legitimate?

Yes.

According to the official website of Jucheng Technology, we learned that the Jucheng platform was launched by Shenzhen Jucheng Weiye Technology Co., Ltd. The company was registered in 2016 with a registered capital of 1 million yuan. Provide door-to-door repair services, covering the repair scope of electronic products such as mobile phones, computers, tablets and home appliances. Based on the business scope including computer software and hardware technology development, sales, maintenance, and technical consulting and services, it can be confirmed that the company operates legally and has relevant professional knowledge and capabilities.