The 35th annual conference on Astronomical Data Analysis Software & Systems 2025 in Görlitz, Germany

The Laser Interferometer Space Antenna (LISA) is a joint ESA-NASA mission that will inaugurate a new era of gravitational wave astronomy from space. Supporting this ambitious mission is the LISA Science Ground Segment (SGS), a globally distributed system developed by ESA, NASA, and the LISA Consortium. The SGS enables end-to-end scientific operations, from payload commanding to data processing and archiving.

The ESA Science Operations Centre (SOC) at ESAC leads science planning, near real-time data processing, and the issuance of low-latency alerts for prompt multi-messenger follow-up. It ensures the long-term curation and accessibility of all mission data products via the LISA Public Archive. The Distributed Data Processing Center (DDPC), led by CNES, orchestrates a federated network of Data Computing Centers across Europe. It is responsible for the development and execution of European scientific pipelines, including the extraction of higher-level data products such as gravitational wave source identification and characterization. Its cloud-native architecture and Kubernetes-based infrastructure enable scalable, reproducible workflows, supported by a full DevSecOps toolchain.

Complementing these efforts, the NASA Science Ground Segment (NSGS) operates dedicated pipelines for initial noise reduction, global source extraction, low-latency monitoring, and catalog production. It also provides US-based data access and scientific support through the NASA LISA Science Center.

Together, these components form an integrated and robust SGS capable of supporting LISA’s 25+ year mission timeline. We present the SGS architecture, coordination strategies, and key technologies that ensure data integrity, system sustainability, and maximal scientific return throughout the mission lifecycle.