Saiful Islam received his M.Sc. (Tech.) degree (Hons.) from Tampere University (TAU), Finland, in 2019, where he is currently pursuing a Ph.D. degree. He is also a Research Scientist at the Finnish Geospatial Research Institute (FGI-NLS). He is a member of the Resilient Position, Navigation, and Timing Group, Department of Navigation and Positioning, FGI-NLS. He is involved in research projects on GNSS receiver development and validation, timing algorithms, maritime navigation, LEO-PNT, GNSS jamming, and spoofing. He is one of the key people in the implementation of the GPS L5 solution in FGI-GSRx. His research interests include GNSS signal processing, resilient software-defined radio (SDR) development, satellite-based augmentation systems (SBAS), and 5G new radio (NR)