JAN

ZGRAGGEN

»ABOUT_ME

Currently based in Lausanne, Switzerland, I am pursuing a MASTER'S IN COMPUTATIONAL SCIENCE AND ENGINEERING at EPFL. My core interests lie in problem-solving, requiring mathematical and algorithmic thinking — skills I am currently applying in the field of ALGORITHMS (Big Data), GRAPH MODELLING (Algorithms & ML), and MACHINE LEARNING . Otherwise, I spend my time traveling, in nature, doing sports, or engaging in creative work.

/CURRICULUM_VITAE /CONTACT

»PROJECTS

Geothermal Heat Pump Simulation

Heatpump IMG

Description: Developed a simulator for geothermal heat pump cycles to analyze component and setup dependencies. Simulates fluid flow and heat conduction through generic pipe geometries and transport media.

  • Implemented pipe environment and visualization pipeline in Python
  • Derived and solved temperature propagation equations along complex paths
  • Implemented numerical integration for heat propagation in C

ODE-Solver Software

ODE-Solve IMG

Description: Developed a flexible and extensible C++ solver for ordinary differential equations (ODEs), supporting implicit and explicit methods including Runge-Kutta, Adams-Bashforth, and Euler. (Toy example: RK4 for planetary motion — image from here)

  • Implemented solver using object-oriented programming in C++
  • Designed architecture for easy extension and method customization
  • Configured build system with CMake and Makefiles
  • Developed test suite using Google Test (gtest)

Aerial Road Segmentation

Road-Segmentation IMG

Description: In this project, we evaluate the performance of various convolutional neural network (CNN) based architectures for road segmentation from aerial imagery.

  • Used Hydra and PyTorch
  • Implemented U-Net and ResNet architectures
  • Fine-tuned pretrained segmentation models
  • Experimented with image transformations and patch sizes

Neuronal cell morphology classification

Road-Segmentation IMG

Description: Combined Algebraic Topology and Graph Neural Networks (GNNs) in multi-embedding fusion models for classifying neuronal morphologies.

  • Implemented multi-embedding fusion model using PyTorch, and PyTorch Geometric
  • Generated topological representations via Persistent Homology
  • Developed pipeline to reproduce state-of-the-art research in neuronal morphology classification
  • Improved classification performance by combining GNN and topological features

Graph based Epilepsy Seizure Detection form EEG-Signal

Road-Segmentation IMG

Description: Explored Graph Machine Learning for seizure detection, experimenting with signal representations, graph construction, and model architectures.

  • Built feature processing pipeline in Python
  • Implemented benchmark models for multi-channel time series, including CNNs and LSTMs
  • Improved classification performance using Graph Neural Networks and hybrid approaches

Feature Engineering on BRFSS survey data for Heart Attack prediction

Project IMG

Description: Predicted heart attacks from survey data using feature engineering and logistic regression models.

  • Built data cleaning, representation, and augmentation pipeline with Python and pandas
  • Developed prediction pipeline with Python and PyTorch

»CREATIVE

/PHOTOGRAPHY

Photo 1

Hong Kong, 2024

Photo 1

North Macedonia, 2021

Photo 2

Thailand, 2024

Photo 3

Malaysia, 2023

Photo 3

Hong Kong, 2023

Photo 3

Taiwan, 2023

Photo 3

Montenegro, 2021

Photo 3

Malaysia, 2023

Photo 3

Türkiye, 2021

Photo 1

China, 2024

Photo 2

UK, 2024

Photo 3

Hong Kong, 2023

Photo 3

Morroco, 2022

Photo 3

Hong Kong, 2023

Photo 3

France, 2024

Photo 3

Bulgaria, 2021

Photo 3

Morroco, 2022

Photo 3

Malaysia, 2023

/ILLUSTRATION

Photo 3

Case Study I, 2023

Photo 3

Case Study II, 2023

Photo 3

Attacama I, 2021

Photo 3

Attacama II, 2021

Photo 3

Orient I, 2021

Photo 3

Orient II, 2021

Photo 3

Mondrian Colors, 2023

Photo 3

Lines, 2023

/LOGO_DESIGN

Photo 3

Surfing Hong Kong (Logo), 2023

Photo 3

Lancement Experts (Logo), 2025