GIS Web Developer

GIS Web Developer - Esri/React SpecialistLocation: RemoteAbout UsAt Codvo, we are committed to building scalable, future-ready data platforms that power business impact. We believe in a culture of innovation, collaboration, and growth, where engineers can experiment, learn, and thrive. Join us to be part of a team that solves complex data challenges with creativity and cutting-edge technology.Position SummaryWe're seeking a GIS Web Developer with strong Esri ArcGIS and React experience to expand our natural language GIS platform. You'll work on integrating spatial analysis with business intelligence, implementing advanced query workflows, and building intuitive map-based visualizations.Primary Technologies• GIS/Mapping: ArcGIS REST API, Feature Services, OAuth 2.0• Frontend: React 18.2, Leaflet 1.9, esri-leaflet• Backend: , Express, SQLite• AI/NLP: OpenAI GPT-4 Turbo integration• Spatial Operations: Haversine distance, buffer analysis, proximity queriesInfrastructure• Version Control: Git/GitHub• Deployment: AWS/Azure (planned)• Database: SQLite (26 contracts, 43 tracts)What You'll BuildCore Responsibilities (70% of time) Spatial Query Implementationo Implement new query types (polygon intersections, multi-layer queries)o Optimize ArcGIS REST API performanceo Build complex WHERE clause generators from natural language Map Visualizationo Create interactive Leaflet-based visualizationso Implement custom feature styling and popupso Build proximity buffers and distance calculations Data Integrationo Connect GIS features with contract/business datao Build efficient data pipelines (SQLite → ArcGIS → Frontend)o Implement caching strategies for query results Performance Optimizationo Reduce API call latencyo Implement client-side filtering for follow-up querieso Optimize geometry rendering for 40+ featuresInnovation Opportunities (30% of time)• Spatial drawing tools (polygon queries)• Real-time collaboration features• Multi-layer spatial analysis• Export to GeoJSON/Shapefile/CSV• Mobile app development (React Native)Required QualificationsMust-Have Skills• years working with ArcGIS REST API and Feature Services• Strong JavaScript/React experience (React Hooks, state management)• Understanding of spatial concepts: coordinate systems (4326/3857), projections, buffers, spatial queries• Experience building interactive web maps (Leaflet, Mapbox, or ArcGIS Maps SDK)• Comfortable with REST APIs and asynchronous JavaScript (async/await, Promises)• SQL/database experience (SQLite, PostgreSQL, or similar)Nice-to-Have Skills• esri-leaflet library experience• OAuth 2.0 token management• OpenAI API or LLM integration• Geospatial algorithms (Haversine, centroid calculations, polygon operations)• backend development• Docker/containerization• Previous GIS chatbot or natural language query experienceWhat Makes a Great CandidateTechnical Excellence• Can explain complex spatial concepts simply• Writes clean, maintainable code• Understands when to optimize vs. when to ship• Comfortable reading and improving existing codebasesProblem-Solving Mindset• Thinks about user experience first• Balances client-side vs. server-side operations• Knows when to use caching vs. real-time queries• Can debug spatial data issues (overlapping geometries, projection mismatches)Communication• Documents code and architectural decisions• Can explain technical tradeoffs to non-technical stakeholders• Comfortable working with remote teamsRed Flags (What We're NOT Looking For)• Only knows ArcGIS Desktop (ArcMap/ArcGIS Pro) with no web API experience• Can't explain REST APIs or asynchronous JavaScript• No experience building user-facing applications• Uncomfortable with modern JavaScript frameworks• Expects to work in isolation without collaborationGreen Flags (What Makes You Stand Out)• Built a web mapping application from scratch• Contributed to open-source GIS projects• Can demo a spatial query interface you've built• Excited about AI/LLM integration• Understands tradeoffs between different mapping libraries• Has optimized ArcGIS REST API performance before