Wartime Director of Finance

About SiPhox Health

SiPhox 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 Role

We'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 Own

Cash and capital efficiency

Runway, burn multiple, and cash forecasting as live operating instruments — not quarterly artifacts

Hard scrutiny on every recurring expense, vendor, contract, and headcount addition

Aggressive negotiation with suppliers, landlords, contractors, and software vendors

A defensible "no" when spending doesn't earn its keep — delivered without slowing the team

Hardware unit economics

COGS, BOM, contribution margin, and yield economics down to the SKU and panel level

Inventory turns, aging, scrap, and reagent usage as managed metrics, not reported ones

Pricing strategy and margin discipline as the product scales

Manufacturing ramp modeling: cost-down curves, learning rates, capacity vs. demand

Operational finance

Embedded in engineering, ops, and supply chain — not adjacent to them

Procurement gates on capital expenditure and tooling decisions

SKU discipline, vendor concentration limits, and standardization wherever feasible

Hiring efficiency: ROI per role, not just headcount plans

Systems and infrastructure

A modern fintech stack (Ramp, Gusto, and beyond) wired into an ERP/MRP backbone

Real-time financial visibility for leadership instead of month-end retrospectives

Automation over headcount wherever a process can be codified

Reporting and dashboards that actually drive decisions

Burn multiple, gross margin by panel, inventory aging, scrap and yield, reagent usage, vendor spend concentration, runway sensitivity, hiring efficiency, instrument payback

Monthly leadership package and board materials that tell the operating truth, not the marketing story

What We're Looking For

Must have

7–10 years of progressive finance experience, with meaningful time at venture-backed hardware or manufacturing companies in the ~50–300 person range

Demonstrated experience managing cash in a constrained environment — you've cut burn without breaking execution

Deep cost accounting and hardware unit economics fluency (BOM, COGS, yield, contribution margin, inventory)

Strong FP&A and operational finance — you build the model and own the operating cadence around it

Comfortable challenging spending decisions across engineering and ops, with the credibility to make it stick

Systems mindset: ERP/MRP, BOM management, procurement controls, inventory discipline

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