Jahir Ahmed received his PhD in 2019 from the Department of Chemistry, School of Physical Science at Shahjalal University of Science and Technology, Bangladesh. Before that, he finished his BSc in Chemistry in 2000, and gained his MSc in Chemistry in 2001 from the University of Dhaka, Bangladesh. From 2020 to 2022, he worked as a postdoctoral research fellow at the Promising Centre for Sensors and Electronic Devices (PCSED), Advanced Materials and Nano-Research Centre, Najran University, Saudi Arabia. Now, he is working as an assistant professor in the department of Chemistry and Promising Centre for Sensors and Electronic Devices (PCSED), Advanced Materials and Nano-Research Centre, Najran University, Saudi Arabia. Currently, his research is focused on the fabrication of electrochemical sensors and biosensors with nanostructure and nanocomposite materials.