His work spans a wide range of fields, including furniture design, product design, interior design, and architecture. Massaud’s design philosophy often combines aesthetic beauty with functional simplicity, focusing on creating designs that are both timeless and sustainable.

He is recognized for his minimalist and refined style, which integrates organic shapes and materials in a way that enhances the user experience. Massaud’s designs often emphasize comfort, ergonomics, and a deep consideration for how people interact with the objects and spaces around them.

Some of his most well-known works include his collaborations with high-end design brands such as B&B Italia, Ligne Roset, Foscarini, and Poltrona Frau. His work ranges from luxurious seating solutions to innovative lighting designs, and he is particularly known for the Papilio chair for B&B Italia and the Molecole lighting collection for Foscarini. His designs often balance tradition with contemporary sensibilities, often incorporating sustainable practices and materials into his creations.

Beyond furniture, Massaud has also worked on larger-scale projects, including architecture and urban design, and his portfolio includes works that merge design with environmental and technological considerations.

Massaud is highly regarded for his holistic approach to design, considering the broader context of the environments in which his work exists.