Pros
They pay very well for Toronto, and the work is super cool: space!! The team is very high quality. Most people I interact with day-to-day are very intelligent, motivated and friendly. I've been here a while and I still learn new things all the time from my peers. The work schedule can be very flexible, depending on your role. This is what has kept me here for so long, unlimited PTO coupled with a culture that allows you to use it is rare to find. I will occasionally work late evenings and weekends, but I consider this a fair trade considering how I also take advantage of the schedule flexibility. You will definitely have opportunities to learn and grow here, although it's small enough where you can hit a ceiling quickly.
Cons
There has been a culture shift over the past couple years as the organization aims to mature. Across departments there is a trend of hiring senior people from outside rather than promoting people internally. Independent of whether this is generally a good decision, it is causing frustration among longer-tenured employees. On the engineering side in particular, leadership has non-negligibly increased the level of required documentation, process, and quality, while also adding more total projects, and not adding sufficient resources. From my awareness of the wider industry, these things are not at all unique to Kepler. But that doesn't make it any less challenging to deal with. While most departments enable you to use the unlimited PTO, there are specific groups that frequently have vacation requests rejected. The unevenness of how this policy is applied is a con. The company's pursuit of defense work with the US government is unpopular among Canadian employees in Toronto.