What is a roast profile in coffee roasting?

A roast profile is the complete set of parameters that define how a specific coffee is roasted - charge temperature, heat application over time, airflow settings, drop point, and the resulting curve of temperatures from start to finish. It is the recipe that produces a particular result from a particular green coffee.

Developing a roast profile involves iterative experimentation: starting with a reference approach, cupping the result, identifying what to change, adjusting the profile, and repeating until the cup expresses what the coffee has to offer. Different green coffees benefit from different profiles - a dense, high-altitude washed Ethiopian typically needs a different approach to a lower-density natural Brazilian - and the same green coffee roasted to different profiles can taste dramatically different.

Once a good profile is established, logging it accurately is what makes it reproducible. A profile exists not just as a set of intentions but as the documented record of what actually happened during the roast - charge temperature achieved, time to yellowing, time to first crack, development time, end temperature, drop time. Without that record, replicating a great result is largely guesswork. For GCC's home roaster customers, building and documenting profiles for each green coffee they work with is the foundation of developing a genuine roasting practice.