text: After completing her PhD Jelfs joined the University of Barcelona, working with Stefan Bromley. She moved to the University of Liverpool, working as a postdoctoral researcher with Matthew Rosseinsky and Andrew Ian Cooper. At the University of Liverpool Jelfs characterised the structure of porous materials. She was funded by an Engineering and Physical Sciences Research Council Programme Grant.
  In 2013 she joined Imperial College London as a Royal Society University Research Fellow. In 2015 she was awarded a European Research Council Starting Grant, which provides €1.5 million funding for five years of materials discovery. Her research will consider porous molecules, organic small molecules and polymers. She uses computational models to predict the relationships between structure and properties. The models can also be used to predict the properties of amorphous frameworks and porous molecules. Her group identified the 20 most probable topologies for porous cage molecules, which can be synthesised through dynamic covalent chemistry.
  In 2018 Jelfs was awarded the Harrison-Meldola Memorial Prize from the Royal Society of Chemistry. She was also awarded an Imperial College London President's Award for Outstanding Early Career Research. In 2019, she was awarded a Philip Leverhulme Prize in Chemistry.