This paper describes our experience using and extending JupyterLab. We started with a copy of CERN SWAN environment, but now our project evolves independently. A major difference is that we switched from classic Jupyter Notebook to JupyterLab, because our users are more insterested in text editor plus terminal workflow rather than in Notebook workflow. However, like in SWAN, we are still using CVMFS to load Jupyter kernels and other software packages, and EOS to store user home directories.