1. Online sign has certain legal effect, and electronic contract can be used in labor contract. Only a reliable electronic signature can an electronic contract signed through a third-party electronic signature platform have legal effect. It is best to sign a paper contract after online signing to ensure the validity of the contract.

2. Legal basis: Article 82 of People's Republic of China (PRC) Labor Contract Law.

Legal Liability for Failure to Conclude a Written Labor Contract If the employer fails to conclude a written labor contract with the employee for more than one month and less than one year from the date of employment, it shall pay the employee twice the monthly salary.

Where an employing unit violates the provisions of this Law and fails to conclude an open-ended labor contract with its employees, it shall pay the employees twice the monthly salary from the date when the open-ended labor contract should be concluded.

Article 83

Legal liability for illegally agreeing on a probation period If the employing unit violates the provisions of this law and agrees on a probation period with the employee, the labor administrative department shall order it to make corrections; If the probation period agreed in violation of the law has been completed, the employer shall pay compensation to the employee based on the monthly salary of the employee after the expiration of the probation period and according to the time limit that has been fulfilled outside the statutory probation period.

2. What are the necessary conditions for the labor contract to take effect?

The necessary conditions for the entry into force of a labor contract are:

1. Both parties to the labor contract must have legal qualifications;

2. The content and form of the labor contract must be legal;

3. The labor contract conclusion procedure is legal.