If you are a Japanese teacher in two universities, you should at least have graduated from top foreign language universities such as Shanghai International Studies University, Beijing Foreign Studies University, Peking University and Nanjing University with a master's degree or doctor's degree in Japanese.
As for N 1 and JTEST mentioned by Kavaj's Cat above, I tell you that at present, the conditions for recruiting Japanese lecturers in better private Japanese training courses and online schools (such as New Oriental, Weimingtian and Hujiang online schools) in China must be at least Japanese undergraduate+Japanese level 8; Japanese teachers in three universities or junior colleges in China generally have at least a master's degree in Japanese from key universities. What is a common N 1 certificate or JTEST certificate? At present, there are many people with N 1 or JTEST A level in society, which only means that he has passed the undergraduate study of Japanese major, and that's all.
As for the teacher's certificate, the Putonghua certificate is the basic condition for being a teacher. Without these two, you can't be a teacher at all (unless it's a messy private training institution, which is not very formal).
You are a Japanese major, and you want to be a Japanese teacher in a technical secondary school after graduation. I'm not sure what it's like to set up a Japanese major in a technical secondary school in China, but I suggest that you at least get a certificate of N 1 and a certificate of CET-8 (JTEST is not well recognized in China, but you can test your Japanese ability. Anyway, one more certificate is better than one less. Plus the previous teacher qualification certificate and Putonghua certificate (at least Grade B). With these, it is safer to apply for a Japanese teacher after graduating from college.