Remitly is in that awkward growth stage where it is figuring out how to still act with the flexibility of a startup, but is truly too large to be as agile as one. Cross-team collaboration and communication can sometimes be difficult to coordinate and execute. They are aware of the problem, though.
For some people, the base salary pay may not be competitive. Stock options are offered, so it's a balance between getting a larger salary now or betting on the future. I'd also recommend weighing the benefits of good work-life balance.