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1. During the interview, they made it sound great, saying that the company would train new employees. But after joining, senior colleagues were indifferent and would only tell you to go ask Mazu.

2. The frameworks and software used by a certain business group are basically all 20-year-old technologies, which are completely unhelpful for finding a new job later.

3. Internal company documentation is scarce. Even the most basic environment setup is taught by new hires to other new hires. Even when documentation exists, it is from ten years ago, so you have to figure things out yourself when problems arise.

4. People who have been at the company for a long time basically all have some connections and stay there slacking off indefinitely.

5. New hires basically cannot stay for long. There is a severe gap in the tenure of internal engineers, for the reasons mentioned above.