BI Architect

• Designede og implementerede automatiserede dataafstemningspipelines til at synkronisere over 100.000 individuelle poster mellem UNHCR's database og partnersystemer, hvilket sikrede referenceintegritet og forbedrede interoperabiliteten på tværs af 11 EHAGL-landsoperationer.
• Udviklet et biometrisk forbundet workflow til håndtering af genbosættelsessager ved hjælp af SQL Server og Power BI. Oprettede brugerdefinerede ETL-scripts, Power Query-transformationer og DAX-baserede KPI'er til understøttelse af interaktive dashboards.
• Ledte træningssessioner for over 60 medarbejdere i marken og på hovedkontoret om struktureret forespørgselsdesign, fejlfinding i datapipelines og optimering af Power BI-ydelse, hvilket fremmer decentral dataanalyse.

• Designede og vedligeholdt dashboards og automatiserede rapporteringsværktøjer til at overvåge projektresultater og forbedre arbejdsgange.
• Udviklet og optimeret datapipelines ved hjælp af SQL og BigQuery til at håndtere store datasæt på tværs af flere UNOPS-operationsenheder.
• Brugte avancerede datavidenskabelige teknikker til at forbedre datakvaliteten, reducere ventetiden og automatisere rapporteringsworkflows.

• Fungerede som PSP Data Management Specialist (barselsvikar) hos UNHCR i Athen, hvor der blev ydet teknisk støtte til PSP-teamet med fokus på at strømline donordatastyring og optimere CRM-arbejdsgange.
• Designede og implementerede automatiserede flowcharts og forespørgsler til støtte for donorengagementaktiviteter.
• Skabte SQL-lignende dataudtræk til ekstern leverandørkommunikation, automatiserede aktivitetsregistreringer i CRM og implementerede logikbaserede e-mail-triggere for at understøtte fastholdelse af donorer - hvilket forbedrede datanøjagtigheden og responsiviteten.
• Demonstreret stærke evner inden for CRM-systemer, dataanalyse, automatisering af arbejdsgange og koordinering af interessenter, der i sidste ende leverer målbare effektivitetsforbedringer inden for en tidsbegrænset opgave.

• Udviklet geostatistiske modeller til at nedskalere vindforudsigelser i lav opløsning ved hjælp af satellitbilleder og rumlige input i høj opløsning.
• Udførte forbehandling af rumlige data, interpolation og visualisering ved hjælp af R, MATLAB og SQL-baserede workflows.
• Kombineret tidsserieanalyse med rumlig modellering for at producere lokaliserede, handlingsrettede prognoser til miljøplanlægning.

• Ledte udviklingen af automatiserede dataværktøjer og workflows til UNHCR's operationer i Nordgrækenland, hvilket forbedrede effektiviteten i rapportering, verificering og sagssporing betydeligt på tværs af mere end 15 steder.
• Designede GIS-baserede værktøjer til kortlægning og demografisk analyse og administrerede den lokale proGres v4-database - reduceredetilbagevendende datafejl med over 70 % ved hjælp af valideringsrutiner og dashboards til detektering af anomalier.
• Byggede flersprogede offentlige informationsplatforme, herunder et QR-kodesystem, som mere end 1.500 PoC'er har adgang til hver måned, og en hospitalsskift-tracker, der bruges flere steder og understøtter koordinering og levering af tjenester.
• Leverede træning til over 60 medarbejdere og partnere i CRM-systemer, automatisering og Power BI og skrev en flersproget guide til byservice, som blev vedtaget af arbejdsgrupper og delt med mere end 5.000 modtagere.

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.