His research interests are Internet technology, distributed systems, data analytics, and mobile and ubiquitous computing. His research has received several Best Paper awards and mentions, for example, at IEEE PerCom, ACM CCR, and ACM OSR. He is actively involved in the Helsinki Institute for Information Technology (HIIT), the Finnish Center for AI (FCAI) flagship, Helsinki Center for Data Science (HiDATA), and the Allied ICT Finland network. His flagship MegaSense research program aims to elevate air quality and environmental monitoring to the next level by providing a real-time and accurate view to the chemical cocktail and the micro climates of mega cities. MegaSense involves a novel hierarchy of distributed air quality sensors, in which more accurate sensors calibrate lower cost sensors. Current low-cost air quality sensors suffer from measurement drift and they have low accuracy. This significant open problem is addressed by a new AI-based calibration scheme. MegaSense integrates with the 5G cellular network and leverages mobile edge computing for sensor management and distributed pollution map creation.