Wartime Director of Finance

About SiPhox HealthSiPhox is a series B-stage startup building frictionless blood testing for AI healthcare. We combine silicon photonics, microfluidics, embedded systems, and semiconductor-grade manufacturing to quantify multiple biomarkers in minutes on a coffee-maker-sized device. Our goal is to build the first mass-market photonic blood analyzer and dramatically expand access to precision diagnostics.We are already in the market serving 10s of thousands of customers with a category-leading mail-in blood test, with 3x YoY revenue growth.Our mission is simple but ambitious: make healthcare proactive instead of reactive by enabling people to measure their health frequently, easily, and affordably.The RoleWe're hiring a Director of Finance to run finance the way a great operator runs a factory — close to the metal, suspicious of every recurring line item, and ruthless about cash.This is not a fundraising-deck role. It's not a controller role. It's a wartime operating role for someone who treats burn rate like oxygen, knows every vendor and headcount line by name, and protects each dollar as if it were their own — while still moving fast enough to enable aggressive execution.Hardware companies bleed cash quietly: through inventory creep, engineering sprawl, duplicated tooling, low yields, vendor sprawl, unused software, and over-spec'd infrastructure. Your job is to see those leaks before they become floods, and to build a culture of capital discipline without creating bureaucracy.You report to the CFO and partner daily with engineering, operations, and supply chain. You will spend time on the manufacturing floor, not just in spreadsheets.What You Will OwnCash and capital efficiencyRunway, burn multiple, and cash forecasting as live operating instruments — not quarterly artifactsHard scrutiny on every recurring expense, vendor, contract, and headcount additionAggressive negotiation with suppliers, landlords, contractors, and software vendorsA defensible "no" when spe