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Joshua De Leon

@joshuadeleon

I build scalable WebGIS platforms, parcel-data pipelines, and geospatial applications for agriculture and land management.

Philippines

Message

I've built enterprise WebGIS platforms and parcel-data pipelines for TopMap Solutions and Land Homes Texas Real Estate, turning CAD and large-scale parcel records into production-ready mapping systems.

At Land Homes Texas Real Estate, I engineered pipelines for 10M+ parcel records and built an interactive WebGIS application with parcel editing, spatial analysis, vector tiles, and optimized spatial queries.

At Ceres AI, I processed and georeferenced 50+ drone orthomosaic datasets daily, maintained 100+ agricultural field shapefiles per day, and helped improve processing speed and accuracy by 40% through standardized workflows.

Across freelance, government, and startup work, I've delivered GIS analysis, hydrological models, spatial databases, and web applications for agriculture, hydrology, urban planning, and land management.

Experience

Work history, roles, and key accomplishments

Current

Market Specialist

Current

Valtiren Systems

Aug 2026 - Present (1 month)

Led product development and technical execution for an early-stage software startup, translating business requirements into practical GIS, data, and software solutions. Designed and developed custom software systems using Python, web technologies, databases, and AI APIs, and collaborated with startup teams across Southeast Asia and Brazil.

Product Development Python Web Technologies Databases AI APIs Market Research Product Strategy Client Discovery

Current

GIS Developer

Current

TopMap Solutions

Aug 2025 - Present (1 year 1 month)

Architected and delivered an enterprise WebGIS platform for Tagum City, converting CAD parcel data into a centralized spatial database. Engineered automated CAD-to-GIS ETL pipelines and developed a C#/.NET desktop application with the AutoCAD .NET SDK.

Django PostGIS Maplibre REST APIs C#.NET AutoCAD SDK Docker Linux VPS

Current

GIS Analyst, Researcher, and Web Developer

Current

Freelance

Feb 2024 - Present (2 years 7 months)

Delivered GIS analysis, spatial databases, cartographic products, and web mapping solutions across 20+ projects spanning agriculture, hydrology, urban planning, and land management. Developed and calibrated hydrological models using HEC-RAS and HEC-HMS, and built custom GIS web applications using Python, Django, PostGIS, QGIS, ArcGIS, PyQGIS, and web mapping technologies.

GIS Analysis Spatial Databases Cartography Web Mapping HEC RAS HEC HMS Python Django PostGIS QGIS ArcGIS

Full Stack Geospatial Web Developer

Land Homes Texas Real Estate

Nov 2025 - Feb 2026 (3 months)

Engineered ETL pipelines to ingest, transform, and manage 10M+ parcel records using Python, PostGIS, PostgreSQL, Docker, and Supabase. Developed an interactive WebGIS application with custom parcel editing and spatial analysis tools using React, TypeScript, Mapbox, Geoman, and Turf.js.

Python PostGIS PostgreSQL Docker Supabase React TypeScript Mapbox Geoman Turf.Js Vector Tiles Spatial Indexing

GIS and Remote Sensing Analyst

Ceres AI

Apr 2024 - Nov 2025 (1 year 7 months)

Processed and georeferenced 50+ drone orthomosaic datasets daily using QGIS, ArcGIS Pro, and remote-sensing workflows, maintaining approximately 95% spatial accuracy. Digitized, validated, and maintained 100+ agricultural field shapefiles daily, and optimized GIS processing workflows, increasing team processing speed and accuracy by 40%.

QGIS ArcGIS Pro Remote Sensing Georeferencing Shapefile Spatial Data Processing Quality Control Mentorship

Field Enumerator and Georeferencer

Department of Agriculture XI - (RSBSA)

Feb 2023 - Jan 2024 (11 months)

Collected and validated farmer and agricultural land records using standardized field-survey procedures, supporting the Registry System for Basic Sectors in Agriculture (RSBSA). Surveyed and georeferenced agricultural parcels using handheld GPS devices, and verified spatial and attribute data through field validation and quality-control procedures.

Field Survey GPS Georeferencing Data Validation Quality Control Land Records