The ESASky web interface primary goal is to enable users to access European Space Agency's (ESA) space astronomy mission data. In addition to the searching and downloading functionalities, the ESASky user community has expressed an eagerness for visualization tools that aid in the data inspection process. They are meant to help scientists assess whether datasets are ultimately useful to their science case (e.g. source variability, exoplanet transit, transient events) to then download and analyse them with specific research domain tools.
To that end, we have developed a photometry and spectroscopy time series data viewer API within ESASky. The ESASky time-series viewer scientific use case is the capacity to, from a tabulated catalogue or spectra/imaging view within ESASky, aggregate multi-mission or multi-object time series data and interact with them for detailed inspection. In this talk, I will tease the ESASky time-series viewer and present the challenges that such tool entailed, as well as those that its future development, scaling and exploitation will likely bring.