The use of biomaterials has become preferential in various industries due to the need for sustainable alternatives to petroleum-based and environmentally detrimental products. In the field of leatherworking, mycelium-based options have emerged as feasible substitutes for commercial applications, given their robustness and versatility. However, pure mycelium skins cannot reach optimal performance in terms of strength and durability. Thus, post-processing with crosslinking additives has been identified as a suitable approach to improve material properties, despite limitations with regards to uniform distribution and studies only considering synthetic compounds. In this framework, bacterial cell factories, capable of interacting with mycelium and producing biobased additives, would introduce a novel post-processing approach which tackles current drawbacks. Therefore, the objective of this project is to develop a co-cultivation strategy to improve the distribution of additive-producing bacteria between mycelium hyphae. To achieve this, bacterial cells will be equipped with the ability to selectively bind to mycelial hyphae, generating a stable interaction between the mycelium and the cell factory, and subsequently engineered to produce promising bioadditives. Lastly, an optimized co-culture setup will be developed to produce improved mycelium leather.