Challenging Big Data Engineering: Positioning of Current and Future Development Topics: Big Data Algorithm, Methodology, Business Models and Challenges; Big Data fundamentals - Services Computing, Techniques, Recommendations and Frameworks; Data Management for Large Data; Future of IoT and Big Data; Modern Architecture; System Design and Architecture; Volume, Velocity, Variety and Veracity; Volume, Velocity, Variety, Veracity and Value In Proceedings of the 4th International Conference on Internet of Things, Big Data and Security IoTBDS - Volume 1, 351-358, 2019 , Heraklion, Crete, Greece