Our Client is seeking a Senior GIS Developer to support the upgrade of business-critical GIS applications from legacy Geocortex technology to the next-generation VertiGIS platform.

The successful candidate will provide senior technical leadership in the design, development, integration, testing, implementation, and support of enterprise GIS solutions. This role requires strong experience with Esri technologies, VertiGIS/Geocortex, Microsoft Azure, GIS infrastructure modernization, and web application development. Key Responsibilities

Lead the analysis, design, development, integration, testing, and implementation of GIS applications
Upgrade existing Geocortex applications to the supported VertiGIS platform while preserving current functionality
Design and develop scalable GIS web applications and supporting services
Provide senior technical expertise across all phases of the Systems Development Life Cycle
Translate business requirements into technical designs and specifications
Develop integrations with enterprise GIS data, geoprocessing services, portals, databases, and external systems
Support GIS infrastructure, networking, cloud modernization, and application deployment activities
Provide technical leadership, project coordination, effort estimates, progress updates, and implementation support
Troubleshoot production issues and support incident-management activities
Develop and maintain installation guides, technical documentation, build books, and support procedures
Mentor junior technical resources and provide guidance on development standards and best practices
Ensure solutions align with GO-ITS standards, AODA requirements, security expectations, and service-delivery objectives Mandatory Requirements

Robust experience with GIS software suites, preferably:

ArcGIS
VertiGIS
Geocortex
FME





Experience with Esri's ArcGIS Enterprise technology stack, including:

ArcGIS Pro SDK
File Geodatabases
ArcGIS Enterprise Portal
ArcGIS Server
ArcGIS Image Server
ArcGIS Notebooks

Experience developing GIS web applications using JavaScript, TypeScript, HTML5, and CSS
Experience with Microsoft Azure, GIS infrastructure, networking, modernization, and maintenance
Experience with Python, VBA, .NET, C++, C#, SQL, and software development kits
Knowledge of service-oriented architecture, microservices, and web services
Experience working with REST APIs, JSON, and AJAX
Strong experience gathering requirements and translating business documentation into technical specifications
Experience developing complex applications using relational and multidimensional databases
Experience leading technical activities throughout the full SDLC Communication and Leadership

Ability to communicate complex technical concepts to non-technical audiences
Experience collaborating with business stakeholders, developers, business analysts, project managers, and technical teams
Ability to resolve technical issues and build consensus on project direction
Experience leading development or application-support teams
Strong analytical, problem-solving, documentation, and decision-making skills Additional Assets

Experience with Ontario Public Sector projects
Experience within the Land and Resources I⁢ Cluster
Knowledge of GO-ITS standards and government project-gating processes
Knowledge of Information Management principles, policies, and practices
Experience with cloud deployment, preferably Microsoft Azure
Understanding of GIS spatial data, geoprocessing, analysis, and enterprise mapping solutions
Experience supporting Commercial Off-the-Shelf and custom enterprise applications
Knowledge of accessibility requirements, including AODA

📌 GIS Developer (Toronto)
🏢 Teckhorizon
📍 Toronto