Pros
Klaviyo is a unique culture. Every start up claims to want to move fast, be transparent, give people opportunity to influence the business and be fun. Fine. What's different here is that our CEO is incredibly intelligent and an exceptional software engineer. The team leads are passionate, selfless people who advocate for their teams and the business over themselves. If problems arise (let's face it, when you're growing 3-4x a year and scaling our backend systems to support 3x volume every year, that will happen) people don't point fingers - they swarm as a team to find the problem and defeat it. I've never felt so lucky to work so hard and see my sisters and brothers in the trenches right next to me, regardless of rank, past experience or responsibility.
Cons
Klaviyo is not for the faint of heart - you must be smart, you must be ambitious, you must care and you must want to build a pillar company in Boston. Otherwise, this won't be fun for you. If that first sentence motivates you, then let's go.