BIOwayste converts organic waste into cooking gas and biofertilizer. Its smaller restaurant-oriented machine can process seven tons of organic waste annually. It also offers scalable solutions with capacities of up to 50 tons per year. Metlej is also a startup trainer for accelerators and incubators in Lebanon and abroad for organizations such as INJAZ Lebanon and Nucleus Ventures. She was selected as a member of the Youth Advisory Board (YAB) for the European Commission Evaluation.