Sets the metabolic rate of the microorganisms and which aromatic compounds are generated.
APPLIED COFFEE SCIENCEDOC · TECH / 01
Coffee fermentation technology and processing
Championship-winning coffees are no longer a matter of luck. They are the result of controlled fermentation, applied microbiology and variable control measured with laboratory precision. These are the processes the producers in our network have mastered — and the ones you reach through us.
Section 01CONTEXT
From agriculture to engineering
For decades, coffee processing came down to three paths: washed, honey and natural. Fermentation happened in open tanks, exposed to the environment, to wild yeast and to the temperature of the day. The result was unpredictable: the same lot could shine one harvest and disappoint the next.
The last decade changed that. The most advanced producers in Latin America adopted the scientific method: they isolated the microorganisms responsible for the profiles they wanted, sealed the tanks to remove oxygen, instrumented the process with sensors and began logging every variable. Fermentation stopped being a happy accident and became a repeatable process.
For an international buyer, that difference is everything. A repeatable profile can be sold to a client, put on a seasonal menu and repeated the following year.
CONTROLLED FERMENTATION · ANAEROBIC COFFEE · THERMAL SHOCK · KOJI
Section 02PARAMETERS
The variables under control
Marks the exact acidity point where fermentation must stop before it turns into a defect.
Measures the sugar available in the mucilage: the fuel for the entire fermentation.
Its absence redirects the metabolic pathway and produces profiles impossible in an open tank.
Every extra hour transforms the profile; the optimum is decided by cupping, not by the clock.
Defines bean stability through months of transit and storage.
Section 03LABORATORY
Applied microbiology
The biggest leap of the last decade did not happen in the field, but in the lab. The producers leading the category work with identified strains, not spontaneous fermentation.
The yeasts and bacteria present in the farm's own ecosystem are identified, isolated in the lab and propagated when they produce the desired profiles. The result is a profile that belongs to that terroir and cannot be copied anywhere else.
Instead of waiting for fermentation to start on its own, a known population is introduced in a measured amount. This removes variability between lots and makes a profile repeatable harvest after harvest.
Techniques borrowed from the sake and beer industries. Aspergillus oryzae breaks down starches and generates sweetness and umami notes; lager yeasts contribute clean, floral profiles. These are among the hardest processes to execute and the most sought after by buyers of exclusive lots.
Section 04SPEC SHEET
Process families
01
Washed with thermal shock
Controlled anaerobic fermentation followed by a succession of hot and cold water.
extreme clarity · vivid fruit · clean cup02
Simple anaerobic
Fermentation in a sealed oxygen-free tank with monitored pressure and temperature.
ripe fruit · dense body · lingering sweetness03
Double anaerobic
Two sealed phases: in cherry and then in mucilage, each with its own curve.
intensity · complexity · winey profile04
Carbonic maceration
Whole cherry fermented in a CO₂-saturated atmosphere.
red fruit · floral · effervescent05
Lactic fermentation
Lactic bacteria steer the metabolic pathway toward lactic acid.
creamy · yogurt · round sweetness06
Koji
Inoculation with Aspergillus oryzae before or during fermentation.
umami · deep sweetness · osmanthus07
Anaerobic natural
Whole cherry fermented without oxygen before drying.
concentrated tropical fruit · liqueur-like08
Controlled honey
Mucilage partially retained with directed humidity and temperature.
caramel · panela · silky body09
Sugarcane decaf
Caffeine extraction with sugarcane-derived ethyl acetate.
retains the specialty profileSection 05THERMAL SHOCK COFFEE PROCESS
Thermal shock, explained
- 01
Thermal shock is not a process family like washed or natural. It is an additional engineering step inserted inside the processing.
- 02
After controlled anaerobic fermentation, the coffee mass is exposed to a succession of hot water and then cold water, at defined times and temperatures.
- 03
Heat opens the structure of the bean and fixes the aromatic compounds developed during fermentation. Cold seals that structure immediately.
- 04
The result is a cup of extraordinary clarity: intense exotic fruit without losing cleanliness — the combination competition baristas and exclusive-lot roasters look for.
Section 06POST-PROCESSING
Drying and stability
The process does not end in the tank. Badly executed drying destroys five days of fermentation work in 48 hours.
The producers in our network use eco-friendly mechanical drying with controlled temperature, which avoids the thermal spikes of sun drying and guarantees a uniform curve across the whole lot. The goal is not just reaching the right moisture, but the right water activity — the indicator that truly predicts whether a coffee will arrive stable in Seoul, Berlin or Melbourne three months after shipping.
FINAL MOISTURE
10–11%
WATER ACTIVITY
aW 0.55–0.60
RESTING IN PARCHMENT
30–60 days
Section 07QA / TRACEABILITY
Quality control and traceability
CUPPING LAB
Every lot is cupped under SCA protocol before it is offered. Nothing leaves without a verified score.
PROCESS LOG
Temperature, pH, Brix and timings are documented per lot and available to the buyer.
PRE-SHIPMENT SAMPLES
Approval samples are sent before any shipment.
FULL TRACEABILITY
From the specific lot and its harvest date through to the container.
These coffees exist. Access is the problem.
The producers capable of executing these processes are few, are over-subscribed and work with a limited number of buyers per harvest. We connect you with them directly.