Your coffee education hub. Explore varieties, processing methods, an interactive world map of 49 coffee-producing countries, roasting science, roast levels, tasting and sensory science, and discover your coffee personality type with the "Find Your Type" quiz.
Beyond roasting and blending, there's a whole world of coffee knowledge that makes every batch more intentional. What makes a Kenyan AA taste so different from a Guatemalan Antigua? Why does a natural process bring out those wild fruity notes while a washed process gives you that clean brightness? What actually happens during first crack, and how does development time shape flavor?
Understanding processing methods, growing regions, altitude, soil, and roast science all feeds back into better roasting decisions. Java Geek puts that knowledge in one place — instead of scattered across YouTube videos, Reddit threads, and half-remembered articles — so you can connect the dots between what you're learning and what you're tasting in every cup.
Java Geek is the knowledge engine of RoastSource. It contains everything you need to understand coffee from seed to cup — bean varieties and their characteristics, how processing methods shape flavor, an interactive world map covering 49 coffee-producing countries, the science behind roasting, and a comprehensive roast level guide.
The module also includes the "Find Your Type" personality quiz, which identifies your coffee personality from 7 types and provides 14 tailored recommendations that flow into the Blending module. Java Geek content enriches your understanding and helps you make more informed decisions across Inventory, Roasting, and Blending.
Java Geek has nine tabs. The coffee reference is free for everyone. Looking for Coffee Journal or Insights? Your roasting analytics now live in Reports, and the Roast Quality Score lives on the Roasting module's Roast Quality tab.
Arabica makes up 60-70% of world coffee production and is the focus of specialty coffee. Cultivar (variety) affects flavor significantly — Gesha is prized for its floral, jasmine-like complexity, while Bourbon offers rich sweetness. When purchasing beans, knowing the cultivar helps predict the cup character.
Processing method has as much impact on flavor as the origin country. Washed coffees are the most consistent and let terroir shine through. Natural (dry-processed) coffees have the highest variability but can produce extraordinary fruity complexity. Honey process sits between the two. Anaerobic fermentation is a newer, experimental approach producing intense and unique flavors.
Higher altitude generally means denser beans and more complex flavors — the slower maturation at altitude allows more sugars and acids to develop. Climate and soil composition (terroir) create the regional character that distinguishes Ethiopian Yirgacheffe from Colombian Huila, even when the same cultivar is grown. Use this knowledge when selecting beans in Inventory.
Grading systems vary significantly by country — Ethiopian Grade 1 is not equivalent to Colombian Supremo. Some countries grade by altitude (e.g., Guatemala SHB = Strictly Hard Bean = high altitude), others by screen size, and others by defect count. Specialty-grade coffee requires an SCA cupping score of 80 or above regardless of the country grading system.
Most flavor development happens in the window between first and second crack — this is where the roaster has the most control over the final cup. Extending development time too long results in baked, flat flavors. Rushing through this phase produces underdeveloped, grassy notes. Understanding the chemistry helps you make better decisions during roasting.
Light roasts preserve origin character — the unique flavors that come from the bean's terroir and processing. Dark roasts develop roast character — caramel, chocolate, smoky notes that come from the roasting process itself. Medium roasts balance both. The optimal roast level depends on the bean's origin, processing, and your intended brew method.
Buying close to harvest ensures the freshest green coffee. Northern hemisphere countries (e.g., Ethiopia, Central America) typically harvest from autumn through early spring. Southern hemisphere countries (e.g., Brazil, Peru) harvest April through September. Countries near the equator, such as Colombia and Kenya, often have two harvests a year. Factor in shipping time — beans arrive at US vendors weeks to months after harvest.
Your coffee personality type reflects your flavor preferences — whether you gravitate toward bright and fruity, earthy and bold, balanced and smooth, or something else. The 14 recommendations per type span different origins, processing methods, and blend styles. Results link directly to the Blending module for personality-based blend recommendations.
AUC is a metric popularized by Artisan and used in advanced roast analysis. Understanding it is optional — it is most useful in Science mode when comparing roast profiles. The Heat-Transfer primer explains why air roasters (mostly convection) roast differently from drum roasters (conduction + convection). This context helps you adapt recipes when switching between roaster types.
This tab follows the SCA's current cupping standard, which replaced the 2004 cupping form in November 2024 — not the older protocol most guides still show. The triangulation drill is the fastest way to sharpen your palate, and everything you learn here feeds straight into better scores in the Ratings module.