- Huawei fundamentally still operates/manages like a Chinese company where centralized decisions were made and sometimes abrupt changes of policies. That could be hard for people who are used to the American company culture.
I would say if you are not flexible enough you may not survive the first year of Huawei.
- Working experiences may vary a great deal across groups
There is no uniform high standard of work satisfaction across different groups. It really depends. Some group may have high turn over, others may be thriving. It really depends on the leader of the group, how well he/she is able to align the group's work w/ company's business interests and can proactively weather the storm. So before joining Huawei, make sure to assess your leader and group well, there could be a high fluctuation of experiences.
- Negative branding/PR issue
Before I joined Huawei, I was scared by the negative PR of Huawei. So if you decide to join Huawei, there may not be the kind of Halo effect of joining some prestigious companies (but if you ever get stuck in a "prestigious" company, you know how worthless "prestige" can be unless you get out of the company). Now having worked at Huawei for over two years, overall I really like the company and couldn't care less about the negative PR.
- How long would Huawei's boom last?
Huawei is clearly going through a window of rapid growth w/ expansions into new domains such as smart devices, IoT, 5G, etc. The last couple of years have been very good (thanks to the booming smartphone business). But how long would that last (given the volatility of cellphone business and the outlook of China's economy)? Nobody can tell. I'd say join Huawei now before the boom goes away and make sure you grow on the job so that you have more career assets to move on when things go bad.
- Lack of diversity
I'd say 80% of technical people are Chinese-speaking. So it could be hard for non-Chinese speaking employee to fit in. But in general colleagues are very nice and go out of the way to help our non-Chinese speaking colleagues.