JERICO RI, the Joint European Research Infrastructure for Coastal Observatories is an integrated pan-European multidisciplinary/multiplatform research infrastructure dedicated to an interdisciplinary appraisal of the coastal marine system environment. It is the coastal component of the future European Ocean Observing System. This Research Infrastructure is designing the future of coastal observation technology for harmonization and interoperability, advanced functionalities, cost efficiency and reliability. The technological developments of the JERICO-S3 EU project aim to strengthen and expand the infrastructure of the European network of coastal observatories. This objective will be achieved with new observing systems and platforms equipped with new technologies for interoperability, innovative sensor packages for multidisciplinary ecosystem monitoring, coupling physics, chemistry and biology. The planned technological developments consist in adapting interoperability standards, inter alia from the NeXOS and EMSODev European projects, developing on- board and on-server smart solutions for adaptive sampling, integrating technologies into dedicated sensor packages, further developing a capacity for high-frequency measurement of low trophic-level biological diversity and contaminants; hence filling critical gaps in the observation of the coastal ocean. An e-infrastructure is being developed and proof tested to integrate digital components (tools), best practices and documentation, from observation data and data products, to methods and coastal observation  services