Upstaff - Senior Full Stack Software Developer

Full Stack Developer is needed in Toronto, Canada.

Client: Upstaff

Location: Toronto, ON, ca

Contract: Contract

Job Description

The Children, Youth & Social Services Cluster (CYSSC) is seeking two Senior Full Stack Software Developers to design, develop, test, deploy, modernize, and support enterprise-grade web applications and services.

The successful candidates will work across the full Software Development Life Cycle (SDLC), translating business and technical requirements into secure, scalable solutions using React, JavaScript/TypeScript, HTML5, CSS3, ASP.NET Core, C#, Microsoft Azure, SQL, Git, and Azure DevOps.

Key Responsibilities

• Translate business and technical requirements into tested, maintainable applications.
• Prepare technical specifications, write code, conduct unit testing, and support implementation.
• Design, develop, deploy, maintain, troubleshoot, and modernize full-stack web applications.
• Build responsive and accessible user interfaces using React, JavaScript/TypeScript, HTML5, and CSS3.
• Develop scalable backend services and RESTful APIs using ASP.NET Core and C#.
• Design reusable application components, architectures, database solutions, integrations, and cloud-based solutions.
• Develop and consume RESTful APIs and integrate front-end applications with backend services.
• Work with relational databases, SQL, and Azure SQL Database.
• Deploy and support applications using Microsoft Azure services.
• Implement and maintain CI/CD pipelines, automated deployments, source control, branching strategies, and release processes using Azure DevOps and Git.
• Troubleshoot application, integration, performance, and production support issues.
• Participate in code reviews and ensure compliance with development standards, security requirements, and best practices.
• Support application deployment, migration, modernization, and cloud transformation initiatives.
• Provide technical architecture support, solution recommendations, technical guidance, effort estimates, and documentation.
• Collaborate with Business Analysts, Architects, Technical Leads, QA teams, project teams, and business stakeholders.
• Work within Agile delivery teams using Scrum and Kanban methodologies.
• Support backlog management, sprint planning, development tracking, and technical delivery through Azure DevOps.
• Contribute to development environment, cloud infrastructure, operational, and deployment requirements.
• Use containerization and orchestration technologies such as Docker and Kubernetes where applicable.

Requirements

Mandatory Technical Skills

• Hands-on React development experience.
• Strong knowledge of JavaScript and/or TypeScript, HTML5, and CSS3.
• Experience developing responsive, accessible, reusable, and scalable front-end components.
• ASP.NET Core and C# backend development experience.
• Experience developing scalable backend services and RESTful APIs.
• Experience integrating and consuming APIs.
• Full-stack application architecture and development experience.
• Database design, relational databases, and SQL experience.
• Application integration and cloud-based solution design experience.

Microsoft Azure Experience

• Azure App Service.
• Azure SQL Database.
• Azure Storage Accounts.
• Azure API Management.
• Azure Logic Apps.
• Deployment and support of secure, scalable, and high-performing cloud applications.

DevOps, CI/CD, and Infrastructure

• Azure DevOps and Git.
• Implementation and maintenance of CI/CD pipelines.
• Automated application builds, testing, deployments, and releases.
• Source control, repository management, branching strategies, and release management.
• Cloud development and deployment environments.
• Docker and Kubernetes for containerization and orchestration.

General Qualifications

• Experience designing, coding, testing, debugging, documenting, deploying, and supporting enterprise applications.
• Strong understanding of object-oriented programming principles and modern development frameworks.
• Experience with modern programming languages, relational database technologies, and SQL.
• Ability to elicit, analyze, and document business and technical requirements.
• Ability to translate requirements into practical technical solutions.
• Experience with effort estimation, technical planning, solution recommendations, and technical documentation.
• Strong analytical, problem-solving, decision-making, and critical-thinking skills.
• Ability to troubleshoot complex technical issues and optimize application performance.
• Strong written, verbal, communication, and interpersonal skills.
• Ability to explain technical concepts to technical and non-technical audiences.
• Ability to work independently, manage competing priorities, and meet project deadlines.

Agile and Collaboration Experience

• Experience working in Agile software development environments using Scrum and Kanban.
• Experience with cross-functional Agile teams, sprint planning, backlog management, and technical delivery planning.
• Experience tracking development activities using Azure DevOps.
• Ability to collaborate with Business Analysts, Architects, Technical Leads, QA teams, project teams, and business stakeholders.
• Experience working within established SDLC processes and enterprise development methodologies.

Mandatory Candidate Checklist

• React, JavaScript/TypeScript, HTML5, and CSS3 experience.
• ASP.NET Core and C# backend development experience.
• RESTful API and backend service development experience.
• Hands-on experience with Azure App Service, Azure SQL Database, Azure Storage Accounts, and Azure API Management.
• Experience implementing or supporting Azure DevOps CI/CD pipelines.
• Git experience, including source control and branching strategies.
• Strong full-stack experience covering front-end development, backend services, databases, architecture, and cloud deployment.
• Application architecture and database design experience.
• Experience working in Agile, Scrum, and/or Kanban environments.
• Experience collaborating with technical and business stakeholders throughout the SDLC.
• Ability to work 100% onsite at 5700 Yonge Street, Toronto.
• Ability to meet the CRJMC security requirement.

Additional Information

Position Details

• Client: Children, Youth & Social Services Cluster (CYSSC)
• Ministry: Ministry of Public and Business Service Delivery and Procurement
• Location: 5700 Yonge Street, Toronto, Ontario
• Work arrangement: 100% onsite
• Openings: 2
• Contract term: October 5, 2026 to March 31, 2027
• Extension: One possible extension term
• Schedule: Monday to Friday, 7.25 hours per day between 8:00 a.m. and 5:00 p.m., excluding lunch
• Security requirement: CRJMC

Submission Information

• Submission deadline: September 30, 2026 at 3:00 p.m.
• Maximum resume length: 5 pages
• Maximum candidate submissions: 2
• Candidates should clearly demonstrate all mandatory technologies, Azure services, Agile experience, and onsite availability on their resumes.

Evaluation Focus

• Technical skills – 80%: Full-stack development, React, JavaScript/TypeScript, ASP.NET Core, C#, RESTful APIs, application architecture, SQL, Azure services, Git, Azure DevOps, CI/CD, troubleshooting, performance optimization, security, and development best practices.
• Soft skills and collaboration – 20%: Agile delivery, cross-functional collaboration, stakeholder engagement, communication, analytical ability, problem-solving, decision-making, and managing competing priorities.