Martin S.

GIS | Real Estate | Data Analytics | Data Validation | Geospatial

I am a GIS and Data Analyst with 12+ years of experience on Upwork and 15+ years of professional experience working with geospatial data, real estate, telecommunications, data validation, and large datasets. My experience covers both technical GIS/data work and real-world research projects. I have worked with large datasets where accuracy, validation, data quality, and consistency are critical. GIS & Geospatial Data I have extensive experience with: GIS data analysis and processing Address validation and standardization Geocoding and reverse geocoding Parcel and property data Spatial analysis Point-in-polygon analysis Coordinate and location data Data validation and quality control Data cleaning and standardization GIS data conversion and processing KML/KMZ, SHP, GeoJSON and other GIS formats Map creation and visualization Large-scale geospatial datasets Identifying and correcting inaccurate or duplicate data Combining data from multiple sources Automated GIS and data workflows Telecommunications GIS I also have significant experience working with telecommunications GIS and network-related data, including working with large datasets, geographic information, addresses, locations, and network-related records. I am comfortable working with complex datasets where information from different sources needs to be matched, validated, standardized, and checked for accuracy. Real Estate & Property Data Another major part of my experience is real estate and land research, including: Vacant land research and analysis Parcel and APN research Property ownership research Comparable sales research Property and market analysis Land pricing County assessor and public-record research GIS parcel mapping Land flipping and auction research Property data validation Data & Automation I enjoy working with large and messy datasets and turning them into clean, structured, usable information. I have experience with: Data validation and quality assurance Large dataset processing Data cleaning and standardization Excel and spreadsheet analysis Python automation SQL and databases Process improvement Automating repetitive research and data tasks Connecting and combining information from different sources Tools GIS: QGIS, ArcGIS, MapInfo, Google Earth Pro, Google Maps, Google My Maps, AutoCAD Data & Databases: Python, Alteryx, MySQL, PostgreSQL/PostGIS, Elasticsearch, Kibana, Excel Real Estate & Research: Parcel/GIS platforms, county records, assessor databases, property research platforms, public records, private GIS webservices. Business & CRM: Airtable, Zoho, HubSpot, Bitrix24, Microsoft Office I have worked with clients ranging from startups to larger companies, and I am comfortable working independently or as part of a team. I have also led teams on high-volume data and real estate projects. Whether you need GIS analysis, address/data validation, telecommunications GIS, property research, large-scale data processing, or workflow automation, I can help. I focus on accuracy, consistency, and finding practical solutions rather than simply processing data. If you have a GIS, data, real estate, or telecommunications project, feel free to contact me and we can discuss what you need.