Pros
Tenable is the best place I have worked at in my career. The culture is amazing - not too corporate, not too "hey we're a startup let's bounce around on yoga balls all day", everyone is super relaxed and yet professional at the same time. Remote workers are not second citizens, my manager listens to me, supports me, and trusts me to get my work done. Everyone is treated based on merit and not seniority (which would be hard to do, considering how many new hires we have). My coworkers are all really smart - Tenable seems to attract good people, I have worked in defense contracting in the MD area where some people just come to work to get a paycheck, everyone here is enthusiastic and hard working. Upper management seems very involved and active in the future of the company, and constantly communicate the plan to the rest of the company. There is always lots to do and many new challenges lie ahead, so coming to work is exciting every day! I'm speaking just for engineering here, by the way - I have seen some negative reviews from other departments, but frankly I have not experienced any of the issues those people describe.
Cons
Company is growing at an enormous rate. I think we have doubled in size over the last 2-3 years and plan to keep going at the same rate or even faster. So far this has been handled pretty well, and this is all a good thing, but I'm apprehensive about whether it's possible to stick to the same values and culture when growing this fast.