Pros
The work matters in a way that's hard to overstate. You can draw a straight line from the code you ship to real-world defense outcomes. That kind of direct impact is rare anywhere. The technical work is also innovative using state-of--the-art tech. Vannevar is building data-heavy AI workflows and agentic architectures applied to hard, real-world defense problems. You're working with messy, large-scale data, designing systems where agents have to actually reason and act reliably, and pushing on problems where the state of the art is still being figured out. For engineers who want to build serious AI infrastructure and see it deployed in environments that matter, there are very few places doing work at this level in defense. The engineering team is excellent and the hiring bar reflects it. Low-ego is cultural value treated seriously — it shows up explicitly in the interview loop and carries weight in hiring debriefs. The result is a team that's sharp, collaborative, and doesn't carry the political baggage you find at a lot of other places. Leadership also isn't afraid to manage out people who aren't working out, but they give real chances first. Logistics are good in ways that actually affect daily life. Software engineers (as opposed to FDEs) don't travel and we have remote flexibility is significant. Unlimited PTO is actually used here, people are encouraged to take it, and longer-tenured folks get sabbaticals.
Cons
A recent RIF put some pressure on retention beyond just the people directly impacted. For context, attrition was extremely low across the first six years of the company, so some of what looks like turnover is people who probably would have explored new things sooner under normal circumstances and treated the moment as a catalyst. Engineering leadership has also turned over recently, which has meant a period of adjustment as well. The RIF wasn't handled well, and to leadership's credit, they've acknowledged that and owned the mistakes publicly. That doesn't undo the impact on the people who were let go. A chunk of the underlying pressure was genuinely outside Vannevar's control — the government shutdown and the failure to pass a continuing resolution created real business constraints — but that doesn't fully account for how the process landed for affected employees. The company has mostly rebounded and culture has stabilized in the months since.