Tianjin's recruitment of teachers for public schools through intermediaries depends on the transparency and legitimacy of the specific intermediaries and their recruitment process. Here are some considerations:

1. reputation of intermediary: consider the reputation of intermediary. Evaluate the reputation of the intermediary through online comments, word of mouth, and feedback from people who have used the intermediary before.

2. Legitimacy: The intermediary is legally registered and qualified. Check with the local government or relevant departments to confirm its legality.

3. Transparency of the recruitment process: Understand whether the recruitment process is transparent. Legal intermediaries usually provide detailed recruitment procedures, including job requirements, salary and treatment, contract conditions, etc.

4. Cooperation with schools: Understand the cooperation between intermediaries and public schools. Some intermediaries have established good cooperative relations with schools and can provide reliable teaching opportunities, but they still need careful examination.