BECS 2021 -- Putting Data Science Pipelines on the Edge -- DNN Model Deployment on Distributed Edges -- Towards Proactive Context-Aware IoT Environments by means of Federated Learning -- Real-time Deep Learning-based Anomaly Detection Approach for Multivariate Data Streams with Apache Flink -- A Novel Approach to Dynamic Pricing for Cloud Computing Through Price Band Prediction -- Learning-based Activation of Energy Harvesting Sensors for Fresh Data Acquisition -- Invited Papers -- Exploiting Triangle Patterns for Heterogeneous Graph Attention Network -- Towards Seamless IoT Device-Edge-Cloud Continuum: Software Architecture Options of IoT Devices Revisited.

This book constitutes the thoroughly refereed post-workshop proceedings of the 21th International Conference on Web Engineering, ICWE 2021, held in Biarritz, France, in May 2021.* The first international workshop on Big data-driven Edge Cloud Services (BECS 2021) was held to provide a venue in which scholars and practitioners can share their experiences and present on-going work on providing value-added Web services for users by utilizing big data in edge cloud environments. The 5 revised full papers and 1 revised short contribution selected from 11 submissions are presented with 2 invited papers. *The conference was held virtually due to the COVID-19 pandemic.