Daniel Opoku Mensah
Verified Expert in Engineering
Geographic Information Systems Specialist and Developer
Toronto, ON, Canada
Toptal member since May 19, 2026
Daniel is a GIS and data specialist with 10+ years of experience with Esri ArcGIS systems and spatial databases for infrastructural, municipal, and utility work. His expertise spans PostgreSQL/PostGIS, Enterprise Geodatabase, Python scripting, Arcade, and FME workflows for data automation, quality control, and spatial analysis. Daniel is a strong collaborator skilled at documenting processes, managing stakeholder relationships, and leveraging remotely sensed data to support decision-making.
Portfolio
Experience
- ArcGIS - 12 years
- AutoCAD - 10 years
- Python 3 - 6 years
- FME - 5 years
- Machine Learning - 5 years
- PostGIS - 5 years
- Azure - 4 years
- Microsoft Power BI - 3 years
Preferred Environment
Python 3, ArcGIS, Leaflet, CSS5, HTML5, PostgreSQL 10, Microsoft Power BI, Looker Studio, Azure, RStudio
The most amazing...
...thing I've developed is a customized web map application leveraging Esri Experience Builder for the City of Pickering, Ontario.
Work Experience
Geomatics Analyst
City of Pickering, ON
- Maintained enterprise GIS on ArcGIS Enterprise and Online with 99.9% uptime using automated Model Builder and Python workflows.
- Built ArcGIS Dashboard applications meeting accessibility standards, rated 4/5+ by stakeholders.
- Analyzed emergency service coverage using weighted overlay and network datasets, identifying gaps with over 98% spatial accuracy.
- Updated geospatial databases daily (parcel fabric, civic addresses, road networks, emergency response) with a 48-hour turnaround and over 98% accuracy.
GIS Analyst
Nutrien
- Managed PostgreSQL/PostGIS databases and Esri feature services with schema alignment and data integrity checks, increasing stakeholder confidence by 20%.
- Automated workflows using Python (ArcPy, Geopandas, and ArcGIS API for Python), improving efficiency by 60%.
- Built 15+ dashboards and web maps using ArcGIS Dashboard and Power BI, reducing analysis time by 30% before the end of the 1st quarter.
Geospatial Technical Lead
DexAfrica Limited
- Built an enterprise solution using PostgreSQL/PostGIS back end with ArcGIS Portal and Field Maps for offline electrical asset management, improving field productivity by 80%.
- Extracted, modified, and converted raster data acquired from LiDAR sources, which improved data accuracy by 30%, providing secure FME workflows for spatial analysis and visualization.
- Performed spatial analysis and network modeling for grid expansion and outage management, achieving over 98% data reliability.
- Developed a mobile data collection platform using Survey123 for agricultural monitoring, improving crop yields by 42% on average.
- Processed LiDAR data to create terrain models and vegetation indices, improving yield predictions by 25%.
- Maintained GIS documentation and metadata frameworks with 100% compliance to data quality guidelines.
GIS Business Analyst
Losamills Consult
- Developed 15+ sales forecasts and spatial analysis visualizations using ArcGIS Dashboards and Power BI for monthly oil marketing companies' operations, achieving 4.5/5 stakeholder satisfaction ratings.
- Conducted market and location analyses using ArcGIS Spatial Analyst and statistical models, delivering sales forecasts for 20+ locations annually with over 90% accuracy.
- Built automated workflows using Python and ArcGIS tools, decreasing manual processing time by 30%.
- Trained staff and created documentation for asset management systems, maintaining 99.9% uptime.
Geomatics Engineer
Samaward Ghana Limited
- Performed spatial analysis and suitability assessments for residential development, improving operational efficiency by 35%.
- Analyzed geospatial data using ArcMap and ArcGIS Spatial Analyst, increasing cross-departmental productivity by 65%.
- Built automated mapping workflows, achieving over 98% accuracy and reducing revision requests by 30%.
Experience
Sales Report Using Power BI Dashboard
https://github.com/dannymensah26/SalesReport-PowerBI-DashboardEducation
Postgraduate Certificate in Artificial Intelligence
Seneca Polytechnic - Toronto, Canada
Master's Degree in Management Information Systems
Ghana Institute of Management and Public Administration - Accra, Ghana
Bachelor's Degree in Geomatic Engineering
University of Mines and Technology - Tarkwa, Ghana
Skills
Libraries/APIs
ArcGIS, Civil 3D, Leaflet
Tools
ArcMap, FME, Microsoft Power BI, AutoCAD
Languages
SQL, Python 3, HTML5
Storage
PostGIS, PostgreSQL 10
Platforms
Azure, RStudio
Other
ESRI Operational Dashboards, GeoPandas, IT Management, Excel 365, QGIS, CSS5, ArcGIS API, Time Management, Problem Solving, Looker Studio, Information Systems, Machine Learning, Esri Experience Builder, ArcPy, IT Projects
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