The Roasting Lab — Stronghold S9X
Our Roasting Philosophy
Precision Roasting.
Every Single Bag.
We don't roast in bulk and hope for the best. Every Nu Coffee bag is triggered by your order — small batch, to profile, and shipped within 24–48 hours of roasting. This is what fresh actually means.
Small Batch Roasting
Industrial roasters operate at 500+ lbs per batch. We max out at 25 lbs. That's not a limitation — it's a choice. At small batch scale, every variable is controllable: temperature curves, development time, the exact moment of first crack.
Large batches average out defects and mask character. Small batches preserve it. When your coffee has complex floral and fruit notes, we can't afford to blend them away. Every origin gets its own roast profile — developed, tested, and locked in before a single bag ships.
The Roast-to-Order Difference
The traditional coffee supply chain is broken by design. Coffee is roasted weeks or months before it reaches you — sitting in warehouses, distribution centers, store shelves. By the time you open the bag, the coffee is a ghost of itself.
Traditional Model
- Coffee roasted in bulk
- Warehoused for weeks–months
- Distributed to retailers
- Sits on shelf: 3–12 months
- You buy stale coffee
Nu Coffee Model
- You place your order
- Roast is triggered same day
- Packaged after 12hr rest
- Ships within 24–48 hours
- Arrives at peak flavor
The CO2 Window: Coffee releases CO2 for 2–7 days after roasting (degassing). The peak flavor window — when aromatics are fully developed and acidity is balanced — is days 5 to 30 post-roast. We ship so you receive your coffee right as it enters that window. That's not coincidence. It's design.
Our Roast Profiles
Ethiopian coffee isn't one-size-fits-all. Different origins have different densities, moisture levels, and flavor compounds — each responding differently to heat. We've developed dedicated profiles for every origin we carry.
Yirgacheffe & Sidamo
Preserves delicate floral and citrus notes. Light roasts require precise temperature control to fully develop sweetness without bitterness — the most technically demanding profile we run.
Kaffa & Limu
The sweet spot. Full development of origin characteristics with balanced acidity and sweetness. Kaffa's ancient forest complexity shines at medium with zero harshness.
Harrar
Extended development brings out stone fruit, dark cherry, and wine-like complexity in our natural-process Harrar beans. The roast amplifies what nature started.
Djimmah
Full city+ roast. Rich chocolate and caramel notes dominate. Dense, syrupy body perfect for espresso. We push just far enough to develop without scorching origin character.
Quality Control
Every batch goes through four QC checkpoints before your order is fulfilled. We don't ship coffee we wouldn't drink ourselves.
Green Inspection — Defect-free beans only. Every lot visually sorted before roasting.
Roast Profile Adherence — Temperature logged throughout. No deviation from approved curve.
Cupping Score — Every batch is cup-tested by our roaster before release. Scored against baseline.
Packaging Seal — CO2 valve integrity, bag seal, roast date stamp. No exceptions.
Taste the Difference Fresh Makes
Roasted to order, shipped within 48 hours, arriving at peak flavor. This is what coffee is supposed to taste like.
Shop Fresh-Roasted Coffee
Nu Coffee Roastery — Stronghold S9X
The Stronghold S9X: Precision Roasting Technology
Nu Coffee roasts exclusively on the Stronghold S9X — one of the most advanced commercial drum roasters in the world. Electrically heated and fully ventless, it eliminates the combustion gases and inconsistencies of traditional gas roasters.
The S9X uses a combination of convection, conduction, and radiant heat — giving our roasters precise control over every phase of the roast curve, from drying to Maillard development to first crack.
The result: a roast profile that's exactly repeatable, batch after batch. Every bag of Nu Coffee reflects the same exacting standard.
Stronghold S9X: Built for Championship Roasting
Developed by Stronghold Technology in South Korea, the S9X is the roaster of choice for World Barista Championship competitors, Michelin-starred café programs, and specialty roasters who demand total control over the roast curve. Nu Coffee operates multiple S9X units — giving us the capacity and precision to roast every order to exacting standards.
Three Heat Sources. One Perfect Roast.
Most drum roasters rely on a single heat source — typically a gas flame. The S9X uses three simultaneous, independently controlled heat delivery systems to develop every layer of the coffee's flavor.
Hot air circulates through the drum, penetrating the bean mass evenly. Convection is responsible for consistent interior development and prevents the scorching that single-source roasters often cause.
Direct contact between the bean and the drum surface transfers heat efficiently to the bean's outer layers, building structure and body. The rotating drum ensures every bean is evenly exposed.
Far-infrared energy penetrates directly into the bean's cellular structure, driving Maillard reactions and caramelization with unmatched evenness — unlocking sweetness and complexity that single-source roasters cannot achieve.
No Gas. No Smoke. No Compromise.
Traditional gas roasters burn fuel to generate heat — a process that introduces combustion byproducts into the roasting environment and requires industrial ventilation systems. The S9X is 100% electric, eliminating combustion entirely.
Its built-in catalytic afterburner captures and neutralizes chaff and smoke particles, producing a clean roasting environment with dramatically lower emissions. This isn't just better for the planet — it's better for the coffee. Without combustion gases in the drum, nothing interferes with the pure expression of the bean's origin character.
The result: a cleaner, brighter, more transparent cup — where the terroir of Sidama, Ethiopia comes through unobstructed.
Digital Profile Roasting
Every roast profile at Nu Coffee is designed, tested, and locked in — then executed identically every single time. The S9X's integrated software logs bean temperature, exhaust temperature, ROR (Rate of Rise), time-to-first-crack, and development time ratio for every batch.
This means the Yirgacheffe you ordered six months ago tastes exactly like the bag you receive today. Repeatability at this level is what separates craft specialty roasting from commodity production.
"The S9X doesn't just roast coffee. It makes every variable in the roast process measurable, controllable, and repeatable. That's what gives us the confidence to say: every bag is the same quality."
— Nu Coffee Roastery
The Bellwether Platform: Roasting Reinvented
In addition to our Stronghold S9X fleet, Nu Coffee operates both lines of the Bellwether Roaster — one of the most innovative commercial roasting platforms ever created. Bellwether Coffee set out to eliminate every barrier to fresh, local specialty roasting: no gas line, no ventilation hood, no roasting expertise required.
Electric. Ventless. Software-Driven.
Like the S9X, the Bellwether is fully electric and ventless — but it takes automation one step further. Its cloud-connected software platform allows roasters to design, save, and share roast profiles digitally. Every parameter — charge temperature, drum speed, airflow, heat application — is controlled and logged automatically.
The Bellwether's 15-lb capacity and rapid batch cycle make it ideal for high-frequency, fresh-to-order roasting — which is exactly how Nu Coffee operates.
Precision + Speed. At Scale.
The Stronghold S9X gives us unmatched roast precision for our specialty single-origin profiles. The Bellwether fleet adds volume and speed — enabling us to fulfill roast-to-order at scale without ever compromising on freshness. Together, they represent one of the most capable small-batch specialty roasting operations in the Northeast.
Taste the Difference — Shop NowThe Stronghold S9X: Championship-Grade Precision
Developed by Stronghold Technology in South Korea, the S9X is the roaster of choice for World Barista Championship competitors, Michelin-starred café programs, and specialty roasters who demand total control over every second of the roast curve. Nu Coffee operates a fleet of S9X units — giving us unmatched roast precision across every origin we carry.
Nu Coffee Roastery — Stronghold S9X Fleet
Three Heat Sources. Zero Compromise.
The S9X uses three simultaneously controlled heat delivery systems — convection, conduction, and radiant infrared — each independently adjustable throughout the roast. No other roaster at this class gives the roaster this level of control over heat application at every phase.
Every roast is digitally logged — bean temperature, exhaust temp, Rate of Rise, first crack timing, development ratio — and locked into repeatable profiles. The same bag, the same quality, every single time.
See How the Three Heat Sources Work
"The S9X doesn't just roast coffee. It makes every variable in the roast measurable, controllable, and repeatable. That precision is what allows us to roast to order — and deliver the same exceptional cup, every single time."
— Nu Coffee Roastery
Small Batch. Roasted to Order.