The goal of this thesis is to design and implement a web-based application for searching and visualizing astronomical images and extracted source magnitudes (brightness). The application will allow users to search for selected celestial objects using their name or sky coordinates and to display available observational data in an interactive and user-friendly form. The main focus of the work will be on the development of the user interface and data visualization, in particular the interactive display of light curves and related image data (cut-outs) showing the object’s surrounding area in the sky. The application will also support exporting selected data and visualizations into common formats for further analysis or presentation (namely VOTable of Virtual Observatory standards: ivoa.net/documents). The system will be connected to an existing database and will include basic user authorization, allowing different levels of access for different user groups. As part of the thesis, existing web portals for astronomical data visualization will be briefly reviewed, and their approaches will be used as inspiration for the proposed solution. Context of the studied target or region (observations from other archives sources) should be displayed in zoomable and adjustable form, e.g. using widely adopted Aladin Lite (aladin.cds.unistra.fr) tool. The result of the thesis will be a functional prototype of the web application, including its design, implementation, testing, and documentation. The source code will be submitted under the MIT license.