Café Molecula

Isa Casandra Ramirez - Founder

Isa Casandra Ramírez

Founder & CEO


Isa started her coffee journey the way she approached everything, with curiosity and intention. As a chemistry student at La Universidad de Puerto Rico, she became fascinated by the science behind the drink keeping her awake throughout her long study sessions. She began wondering about how soil, altitude, and heat could transform a single fruit into something complex, comforting, and alive.

After years of working in local coffee shops and training across Puerto Rico's mountain coffee fields, she saved enough to open a small coffee bus outside the marina of Old San Juan. That bus became six locations. Those locations became a school, a farming cooperative network, and a community. Today, Isa builds spaces where great coffee and real connection are always on the menu.

Sourcing & Roasting


hand holding coffee fruit

The Harvest

Every bean we use is sourced directly from Puerto Rican farming cooperatives. We work hand-in-hand with the families who grow our coffee, ensuring fair compensation, sustainable practices, and full transparency in the entire process.

The Fruit

Great coffee starts long before the roast. We select only ripe, hand-picked cherries, the fruit that surrounds each bean, because quality at origin is something no amount of technique can replace.

basket with coffee bean fruits
coffee beans roasting

The Roast

We roast in small batches of 20–30 lbs to maintain freshness and consistency. Every roast is calibrated with the same precision Isa brought to her chemistry lab, because we believe the difference between a good cup and a great one is always in the details.

The Bean

What ends up in your cup has traveled a long road. From the highlands of Puerto Rico to our Santurce roastery, each bean carries the story of the land, the farmer, and the craft that brought it to life.

roasted and toasted beans