GIS Web Developer

GIS Web Developer - Esri/React Specialist

Location: Remote (US-based preferred)

About Us

At 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 Summary

We'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 queries

Infrastructure

• Version Control: Git/GitHub
• Deployment: AWS/Azure (planned)
• Database: SQLite (26 contracts, 43 tracts)

What You'll Build

Core Responsibilities (70% of time)

1. Spatial Query Implementation

o Implement new query types (polygon intersections, multi-layer queries)

o Optimize ArcGIS REST API performance

o Build complex WHERE clause generators from natural language

1. Map Visualization

o Create interactive Leaflet-based visualizations

o Implement custom feature styling and popups

o Build proximity buffers and distance calculations

1. Data Integration

o Connect GIS features with contract/business data

o Build efficient data pipelines (SQLite ArcGIS Frontend)

o Implement caching strategies for query results

1. Performance Optimization

o Reduce API call latency

o Implement client-side filtering for follow-up queries

o Optimize geometry rendering for 40+ features

Innovation 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 Qualifications

Must-Have Skills

• 3+ 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 experience

What Makes a Great Candidate

Technical Excellence

• Can explain complex spatial concepts simply
• Writes clean, maintainable code
• Understands when to optimize vs. when to ship
• Comfortable reading and improving existing codebases

Problem-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 teams

Red 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 collaboration

Green 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