Stelios Christodoulou

| About | Profile Pages | Publications | Presentations/Talks | Skills | Background/Experience |

About

Hello and welcome to my personal site. I currently work as a full stack Data Analyst and Operations Engineer for a global Mobile Satellite Communications Operator. I have subject matter expertise in:

• Spatial and timeseries data.
• Communications and Networks.
  • Latency.
  • propagation and rain fade.
  • rain diversity for SatCom.
  • Dependency on PNT and GNSS.
• Mobility/Transport:
  • Maritime
  • Aviation
  • rail
  • road
• PNT:
  • GNSS vulnerabilities.
  • GNSS performance crowdsourced monitoring.
  • GNSS vs INS use in commercial aviation.

My other pages

• Linked In profile
• Github portfolio
• Music website.
• My old Data analysis blog (2017-2019)

Publications

• Impacts of GNSS Interference on Maritime Safety A special report by the Royal Institute of Navigation Maritime GNSS Interference Working Group (2026)
• Advice to Government on improving rail passenger access to data services: Assessment of passenger numbers at different places along the mainline rail network. Ofcom (2018)
• Frequent locations of oceanic fronts as an indicator of pelagic diversity: Application to marine protected areas and renewables Miller, P.I. & Christodoulou, S. (2014) Marine Policy. https://doi.org/10.1016/j.marpol.2013.09.009

Presentations and Talks

• After the Titanic: Maritime Distress and Safety. Talk to primary school students on GMDSS.
• Open Data on GPS interference: Scandinavia and the Baltics session in Open Data Camp Edinburgh 2025
• Basic Time-series Analysis in Pandas lightning talk in PyData London 2025

Skills

• Python: Standard library, (Geo)Pandas, Jupyter, SciPy, pip, sklearn.
• Data Management: SQL, dbt, PostGIS, Hadoop (Pig, Hive).
• Visualisation: Tableau (Desktop, Server), QGIS, Excel.
• Google Cloud: BigQuery, Storage, IAM, Monitoring, Virtual Machines, Notebooks.
• Service and Project Management: Github, ITIL 4, Continuous improvement (Lean Six Sigma), Agile (Jira).
• Diagrams: Lucid Charts, Mermaid.
• Corporate automation: MS Power Automate, Slack Workflows.
• Languages: native Greek, professional fluent English, beginner French.

Academic background and professional experience

I completed a 4 year integrated masters (M.Eng) in Engineering (Electrical and Information Sciences) at the university of Cambridge.

• Currently in Viasat/Inmarsat.
• Ex-Ofcom Spectrum Technology.
• ex-Inmarsat Satellite Resource Management.
• ex-PML Remote Sensing Group.
• ex-Broadcom Mobile Multimedia.