Yasin Sezer T.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I am a Full Stack developer with specialized expertise in Geographic Information Systems (GIS). My experience spans both front-end and back-end technologies, allowing me to create advanced geospatial data processing, analysis, and visualization applications. I have deep knowledge in developing GIS solutions, including map-based applications, interactive data visualizations, and spatial data analysis. By integrating tools such as GeoJSON, PostGIS, Leaflet, and Mapbox into my projects, I deliver user-friendly and high-performance applications. On the back-end, I work extensively with Python, Node.js, JavaScript, and SQL, handling database management, server-side calculations, and API integrations. I am skilled at processing large-scale geospatial datasets and developing scalable systems for efficient spatial analysis. Focusing on user experience, I employ modern technologies like RESTful APIs, GraphQL, and Web Map Services (WMS) to ensure seamless data integration. With a full-stack approach, I deliver end-to-end solutions that bridge both the front-end and back-end aspects of GIS applications. Key Expertise: Geographic Information Systems (GIS) Development Map-Based Applications (Leaflet, Mapbox) GeoJSON and PostGIS Integration Front-end: HTML, CSS, JavaScript (React, Angular) Back-end: Python, Node.js, SQL RESTful API, GraphQL, WMS Integration Big Data and Spatial Analysis