Senior software developer Jobs in Oshawa, ON

We are seeking an experienced Senior Software Developer with specialized GIS system expertise to lead the technical development, upgrade, and maintenance of enterprise spatial applications. In this role, you will modernize and transition legacy Geocortex-based web applications to the next-generation VertiGIS platform. Operating across full SDLC phases, you will translate complex business requirements into high-performing geospatial solutions, engineer automated data workflows, write custom web scripts, and collaborate closely with cross-functional development teams to ensure high application availability, security, and scalability.

Location: Toronto, ON (Fully Onsite – 5 days/week required)

Duration: 7-month contract.



Advantages
High-Impact Tech Upgrade: Drive large-scale modernization of enterprise web applications to modern VertiGIS platforms.

Advanced GIS & Cloud Stack: Gain hands-on exposure across ArcGIS Enterprise, VertiGIS, FME, Azure, and spatial web APIs.

Full SDLC Leadership: Author core architecture deliverables, design spatial data pipelines, and guide technical teams end-to-end.

Collaborative Onsite Environment: Partner directly with cross-functional engineering and project teams in a predictable 5-day onsite workspace.



Responsibilities
GIS Platform Modernization: Lead technical design and upgrade activities to transition legacy Geocortex applications to current VertiGIS platforms while maintaining core business functionality.

Geospatial Web Development: Design and build interactive GIS web applications using JavaScript, TypeScript, HTML5, CSS, and modern framework SDKs.

Spatial Data Pipeline & Automation: Develop, test, and maintain automated spatial ETL processes, data models, and workflow scripts using FME, Python, and SQL databases.

GIS Enterprise Architecture Integration: Configure and manage enterprise GIS suites, including ArcGIS Enterprise, ArcGIS Server, ArcGIS Portal, File Geodatabases, and RESTful web services.

Full-Lifecycle Software Engineering: Lead technical aspects throughout the Systems Development Life Cycle (SDLC), including requirements gathering, architecture documentation, code compilation, and unit testing.

System Troubleshooting & Maintenance: Diagnose and resolve technical defects, support incident management, address application performance issues, and ensure compliance with accessibility and security standards.

Technical Documentation & Governance: Author comprehensive technical deliverables including build books, installation guides, system specifications, and architectural documentation.

Team Guidance & Collaboration: Provide technical advice, guidance, and code review support to junior developers while collaborating with business analysts and project leads.



Qualifications
GIS Software Suite Mastery: Hands-on professional experience developing and maintaining applications using GIS software suites—specifically ArcGIS, VertiGIS/Geocortex, and/or FME (Strictly Required).

Enterprise Spatial Technologies: Demonstrated experience with Esri’s ArcGIS Enterprise suite (ArcGIS Server, Portal, ArcPro SDK, File Geodatabases, ArcGIS Notebooks) (Strictly Required).

Web & Scripting Development: Proven experience developing web applications and custom scripts utilizing JavaScript, TypeScript, HTML5, CSS, Python, SQL, and .NET/C# (Strictly Required).

Service Architecture & APIs: Solid understanding of service-oriented architecture (SOA), microservices, and RESTful web services (REST, JSON, AJAX).

Technical Documentation & Communication: Superior skills in translating business requirements into technical specs, creating build books/guides, and explaining complex concepts to non-technical stakeholders.

Nice-to-Have Assets:
Experience deploying GIS solutions within cloud environments, particularly Microsoft Azure.

Understanding of digital accessibility standards (such as AODA/WCAG guidelines).



Summary
If you're interested in the "Senior Software Developer - CRM" role based in Toronto, we encourage you to apply online at www.randstad.ca.
Only qualified candidates will be contacted for the next steps. We look forward to hearing from you!

Randstad Canada is committed to fostering a workforce reflective of all peoples of Canada. As a result, we are committed to developing and implementing strategies to increase the equity, diversity and inclusion within the workplace by examining our internal policies, practices, and systems throughout the entire lifecycle of our workforce, including its recruitment, retention and advancement for all employees. In addition to our deep commitment to respecting human rights, we are dedicated to positive actions to affect change to ensure everyone has full participation in the workforce free from any barriers, systemic or otherwise, especially equity-seeking groups who are usually underrepresented in Canada's workforce, including those who identify as women or non-binary/gender non-conforming; Indigenous or Aboriginal Peoples; persons with disabilities (visible or invisible) and; members of visible minorities, racialized groups and the LGBTQ2+ community.

Randstad Canada is committed to creating and maintaining an inclusive and accessible workplace for all its candidates and employees by supporting their accessibility and accommodation needs throughout the employment lifecycle. We ask that all job applications please identify any accommodation requirements by sending an email to accessibility@randstad.ca to ensure their ability to fully participate in the interview process.