Lumbra - Frontend Engineer, Core Platform

• $120K – $300K • Offers Equity • Plus equity and benefits • Lumbra builds the vendor-neutral operating system for agentic AI in high-consequence environments. In our first ten months we won four fully competed prime contracts across the U.S. Government, every one of them deploying into classified spaces. We are live on JWICS. We were selected from a field of 200+ companies for a defense innovation challenge and won it. We beat two established defense primes on the same program and earned the follow-on, now in execution. • Nebula, our agentic harness, turns days of manual synthesis into minutes of analysis. Whether analysts trust it depends heavily on the interface: how an agent's work streams in, how its sources and reasoning are shown, and how quickly someone can move through dense, connected data under pressure. • We want a frontend engineer to own that experience. You build the React and TypeScript application analysts use every day, make it fast and legible, and make sure it works the same in commercial cloud and on disconnected, classified networks. • This role is on site in Arlington, Virginia. It is not eligible for remote or hybrid work. • The base salary range for this role is $120,000 to $300,000, spanning our Engineer II and Senior Engineer levels. Where an offer lands depends on scope, autonomy, and technical capability, which we assess through the interview process rather than by years or title. Our ranges are a real guide, and we are flexible for the right person: if your experience clearly exceeds this role's scope, we will consider you at a higher level, with that level's range. Base salary is one part of total compensation, alongside equity and the benefits below. • $120,000 to $300,000 • Health, dental, and vision insurance. 99% of your premiums covered, and 100% of your dependents' premiums. • Health, dental, and vision insurance. • Optional HSA plan. Lower premium, HSA eligible, fully portable, self-directed or managed. • Optional HSA plan. • Health Reimbursement Account for qualified healthcare expenses. • Health Reimbursement Account • Life insurance of $150,000 plus AD&D, 100% company paid. • Life insurance • 401(k) with a 100% match on the first 6%, immediately vested. No cliff, no waiting period. Yours from day one. • 401(k) with a 100% match on the first 6%, immediately vested. • Wellhub Gold. Everything from Gold's Gym to Lifetime, fully covered, plus , F45, and hundreds of other studios. • Wellhub Gold. • Unlimited PTO. Real time off, not accrual-based. Take what you need, no counting required. • Unlimited PTO. • Every federal holiday, plus additional paid days off over the winter break. • Every federal holiday, • Supportive leave of absence program, including time off for military service, medical events, and parental leave. • Supportive leave of absence program, • Breakfast, lunch, and endless snacks every day you are in the office. • Breakfast, lunch, and endless snacks • Company phone plan. A new iPhone, fully company paid. • Company phone plan.