Avantages
The problems I work on are extremely interesting. I'm not usually very self-motivated when it comes to writing code -- I almost never work on side projects and I found most of my past jobs boring. However, the work here has kept me focused and excited. The engineering team is top notch. Every team seems to be filled with people who genuinely care about their work and are willing to help each other. Terrific work flexibility -- the company strongly supports odd work hours or remote work.
Inconvénients
As others have mentioned, you need to be independent and adaptable to do well here. It's still a small company where things are changing quickly. I was given a great mentor when I joined -- but ultimately it's been up to me to unblock myself on my own work and figure out what I need to be more productive. There's very little micromanagement here, and I'm expected to hold myself accountable for my work. Long term business outlook is a bit uncertain. The big bet is that Helios will succeed in the cloud-native database space, and it remains to be seen whether that will pan out. The uncertainty doesn't really bother me (I care more about being interested in the engineering work) but it might be a negative for others.