BI Architect

• Utformet og implementerte automatiserte dataavstemmingsrutiner for å synkronisere over 100 000 individuelle poster mellom UNHCRs database og partnersystemer, noe som sikret referanseintegritet og forbedret interoperabilitet på tvers av 11 EHAGL-landsoperasjoner.
• Utviklet en biometrikoblet arbeidsflyt for håndtering av gjenbosettingssaker ved hjelp av SQL Server og Power BI. Laget tilpassede ETL-skript, Power Query-transformasjoner og DAX-baserte KPI-er for å støtte interaktive instrumentpaneler.
• Ledet opplæringsøkter for over 60 ansatte i felten og på hovedkontoret om strukturert spørringsdesign, feilsøking i datapipelines og optimalisering av Power BI-ytelse, noe som fremmer desentralisert dataanalyse.

• Utformet og vedlikeholdt dashbord og automatiserte rapporteringsverktøy for å overvåke prosjektresultater og forbedre arbeidsflyten.
• Utviklet og optimaliserte datapipelines ved hjelp av SQL og BigQuery for å håndtere store datasett på tvers av flere operative enheter i UNOPS.
• Brukte avanserte datavitenskapelige teknikker for å forbedre datakvaliteten, redusere ventetid og automatisere rapporteringsarbeidsflyter.

• Jobbet som PSP Data Management Specialist (barselsvikariat) ved UNHCR i Athen, der vi ga teknisk støtte til PSP-teamet med fokus på å effektivisere datahåndteringen for givere og optimalisere CRM-arbeidsflyten.
• Utformet og implementerte automatiserte flytskjemaer og spørringer for å støtte aktiviteter knyttet til giverengasjement.
• Laget SQL-lignende datauttrekk for ekstern leverandørkommunikasjon, automatiserte aktivitetsregistreringer i CRM-systemet og implementerte logikkbaserte e-postutløsere for å støtte opp om oppbevaring av givere, noe som forbedret datanøyaktigheten og responsen.
• Demonstrert sterke evner innen CRM-systemer, dataanalyse, automatisering av arbeidsflyt og koordinering av interessenter, og til slutt levert målbare effektivitetsforbedringer innenfor et tidsbegrenset oppdrag.

• Utviklet geostatistiske modeller for å nedskalere vindprognoser med lav oppløsning ved hjelp av satellittbilder og høyoppløselige romlige data.
• Utførte preprosessering, interpolering og visualisering av romlige data ved hjelp av R, MATLAB og SQL-baserte arbeidsflyter.
• Kombinerte tidsserieanalyse med romlig modellering for å produsere lokale, handlingsrettede prognoser for miljøplanlegging.

• Ledet utviklingen av automatiserte dataverktøy og arbeidsflyter for UNHCRs operasjoner i Nord-Hellas, noe som har ført til en betydelig effektivisering av rapportering, verifisering og sporing av saker på mer enn 15 steder.
• Utviklet GIS-baserte verktøy for kartlegging og demografiske analyser, og administrerte den lokale proGres v4-databasen - redusertetilbakevendende datafeil med over 70 % ved hjelp av valideringsrutiner og dashbord for deteksjon av avvik.
• Built multilingual public information platforms, including a QR code system accessed by 1,500+ PoCs monthly and a hospital shift tracker used across multiple locations, supporting coordination and service delivery.
• Vi har gitt opplæring til over 60 ansatte og partnere i CRM-systemer, automatisering og Power BI, og vi har utarbeidet en flerspråklig veiledning for urbane tjenester som er vedtatt av arbeidsgrupper og delt med mer enn 5 000 mottakere.

During the 2016 refugee crisis in the Northern Aegean, Stelios worked on the front lines of UNHCR’s data response team, leading efforts to structure and streamline operational data for coordinated action across agencies.

• Coordinated efforts during the emergency refugee influx in the Northern Aegean, leading the first complete registration masterlist for refugees on Chios, which was crucial for scheduling and operational planning by the Asylum Service and EASO.

• Organized and carried out comprehensive mapping exercises to monitor refugee movements. Maintained continuous data updates in collaboration with local authorities, ensuring real-time visibility of arrivals and departures.

• Created a web GIS platform to monitor boat arrivals, supporting first reception actors. This platform improved real-time decision-making and could be replicated on other islands. Provided timely, actionable insights through daily statistical snapshots and operational reports shared with key stakeholders.

• Delivered capacity-building sessions with the Asylum Service and EASO, offering technical training in data systems. Developed briefing kits and site profiles to assist partner planning and humanitarian efforts.

• Enhanced information systems and partner coordination with innovative tools, accurate reporting, and proactive stakeholder engagement in a rapidly changing operational context.

GeoData Bank SA provided cadastral and geospatial consulting services to major banks during Greece’s national land registry rollout. As founder and CEO, Stelios led the complete delivery of data services related to property rights and land documentation.

• Delivered comprehensive cadastral data management services to banking institutions during the drafting of the National Cadastre. Specialized in legal processing of ownership titles, ensuring compliance with Law 2308/95, including drafting and correcting Declarations and resolving documentation gaps and delays.

• Managed the preparation and submission of appeals to Cadastral Offices, tracked progress, and offered real-time consulting support to legal and property departments throughout procedural reviews.

• Supervised updates to internal bank systems concerning finalized rights registration and supported the integration of GIS tools for asset valuation. Enabled efficient portfolio management through precise geospatial analysis, aiding decision-making on property ownership, asset value, and legal compliance across Greece.

The University of the Aegean is a prominent institution in geospatial and environmental sciences. Stelios contributed as a doctoral researcher in spatial analysis, focusing on environmental modeling and uncertainty quantification.

• Conducted advanced research on uncertainty propagation in the spatiotemporal distribution of environmental variables, aiming to enhance prediction accuracy in geospatial and environmental models. Utilized statistical modeling and data science techniques across Geographic Information Science and Earth and Environmental Sciences fields.

• Contributed to the academic community through three peer-reviewed journal publications and several international conference presentations. Assisted in teaching undergraduate and graduate courses, providing support in course delivery and student mentoring.

• Participated in interdisciplinary projects, strengthening expertise in geospatial analytics, environmental modeling, and scientific communication.

InfoDim is a geospatial technology company that provides GIS-based solutions for environmental safety and risk management. Stelios contributed as a GIS expert to a fire prevention project focused on early warning systems and spatial analytics.

• Conducted geospatial data collection, cleaning, and analysis to support fire risk assessment and mitigation planning.
• Developed GIS-based risk models that integrate vegetation, topography, and infrastructure data to inform early warning systems.
• Created mapping deliverables and analytical reports that improved emergency preparedness and operational planning.
• Worked with multidisciplinary teams to ensure the accuracy and relevance of spatial outputs for disaster management agencies.

Makedoniki is a consultancy specializing in land management, urban planning, and geospatial analysis. Over a decade, Stelios contributed to multidisciplinary studies supporting the development of Greece's national cadastre and infrastructure planning.

• Contributed to cadastral, urban planning, and land use studies supporting the establishment of Greece's national cadastre system—applied expertise in legal and technical property rights frameworks to ensure alignment with national land management standards.

• Provided geospatial and topographic survey support for hydraulic, geological, and environmental studies. Delivered consultancy services on land consolidation, spatial planning, and urban development projects, ensuring sustainable and accurate implementation.

• Oversaw project and data management processes, maintaining quality assurance across multidisciplinary studies. Supported cross-sector collaboration with public authorities, surveyors, and technical teams to enhance spatial data governance and planning efficiency.