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Posted 17 days ago

RQ11557 - Software Developer- Front End - Senior

@ Flexstaf IT

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Toronto, Ontario

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SIGNALS

Overview

Flexstaf IT is hiring a senior front-end developer to customize and build ESRI-based web mapping applications for a public sector client. The work centers on GIS viewers, SDK customization, and accessible interfaces.

Responsibilities:

Customize mapping applications with VertiGIS, Geocortex or ArcGIS SDKs
Build and deploy customized GIS viewers and tools
Integrate workflows and external services into map viewers
Build accessible, WCAG 2.0 AA compliant UI components

Requirements summary:

Experience customizing mapping applications with ESRI-based SDKs
Strong JavaScript, TypeScript and React skills
Experience with ArcGIS REST API, ArcGIS Server and ArcGIS Portal
Experience with AODA and WCAG 2.0 AA accessibility standards

Tools & skills

VertiGIS Studio Geocortex Viewer ArcGIS Maps SDK for JavaScript ArcGIS Server ArcGIS Portal ArcGIS Experience Builder Web AppBuilder

Source and dates

Source type not verified · manatal

Employer posting date: 2026-10-20
First seen by our source: 2026-10-20
Source record updated: 2026-11-03

These dates describe the source record, not a live verification that the employer is still hiring. Check the original posting.

Job details

Seniority	Senior
Department	Software development
Work setting	Office
Position	Mostly sitting
Physical demands	physical low · computer high
Languages	English

Summary and details written by AI from the posting; the employer’s posting is the authority.

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Flexstaf IT

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Field	Value
Open jobs on Jobsy	85

Job description

Must Haves:

Experience customizing mapping applications using:

VertiGIS Studio Web SDK (preferred)
GeoContext Viewer for HTML5 SDK
ArcGIS Maps SDK for JavaScript (formerly ArcGIS API for JavaScript)

Experience and Skill Set Requirements

Desirable Skills:

Demonstrated ability to work independently
Demonstrated ability to work collaboratively with the project team to meet goals and objectives
Experience with ESRI-based GIS technologies and web mapping platforms

SDK Customization and Web Mapping Development – 30%

Experience customizing mapping applications using:
- VertiGIS Studio Web SDK (preferred)
- Geocortex Viewer for HTML5 SDK
- ArcGIS Maps SDK for JavaScript (formerly ArcGIS API for JavaScript)
Experience developing and extending features within web mapping applications using JavaScript/TypeScript and modern frameworks such as React
Proven ability to build and deploy customized GIS viewers and tools tailored to end-user requirements

ESRI Platform and Application Builders – 25%

Proficiency with ESRI-based application builders, including:
- VertiGIS Studio (Web and Workflow) (preferred)
- Geocortex Essentials
- ESRI Experience Builder and Web AppBuilder
Experience integrating workflows and external services into map viewers
Familiarity with user roles, permissions, and application deployment within the ESRI ecosystem

Technical and Integration – 30%

Experience consuming and interpreting GIS services using:
- ArcGIS REST API
- ArcGIS Server (including familiarity with publishing services)
- ArcGIS Portal (including administration and integration)
Strong skills in web technologies including:
- JavaScript / TypeScript
- HTML and CSS for UI customization and responsive design

Accessibility – 10%

Experience developing and designing intuitive, simple-to-use interfaces
Experience developing and coding web UI components that are compliant with the Accessibility for Ontarians with Disabilities Act (AODA) and WCAG 2.0 Level AA

Public Sector Experience – 5%

Experience working with the Ontario Public Service (OPS) or broader public sector, with a demonstrated track record of delivering value in complex, multi-stakeholder environments

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RQ11557 - Software Developer- Front End - Senior

Overview

Responsibilities:

Requirements summary:

Tools & skills

Job details

Flexstaf IT

Experience and Skill Set Requirements

Desirable Skills:

SDK Customization and Web Mapping Development – 30%

ESRI Platform and Application Builders – 25%

Technical and Integration – 30%

Accessibility – 10%

Public Sector Experience – 5%

Journal

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