Hiring: Senior Full Stack Developer

Location: Toronto, Ontario, Hybrid (3 days per week in office)

Duration: October 19, 2026 – October 4, 2027 (possibility to extend)

Hourly Rate: $80/hour - $100/hour (based on experience)

Client: Public Sector - Healthcare

Responsibilities:

- Design, develop, test, deploy, and maintain enterprise applications using .NET, AngularJS, JavaScript, and related technologies.
- Develop and integrate secure REST APIs and modernize legacy .NET Framework, WCF, Windows Services, and Windows Forms applications.
- Build responsive web user interfaces and implement secure authentication using JWT/OAuth2.
- Develop high-performance, multithreaded, and asynchronous applications.
- Develop, configure, and support Azure cloud services, including App Services, Azure SQL, Storage, Event Hub, ADX, Key Vault, and monitoring solutions.
- Develop and optimize SQL Server databases, including complex queries, stored procedures, indexing, execution plans, and performance tuning.
- Perform application testing, production troubleshooting, root-cause analysis, and performance optimization across application, database, cloud, and infrastructure layers.
- Support DevOps and CI/CD processes using Azure DevOps and Git-based source control.
- Conduct code reviews and ensure high-quality, maintainable, secure, and well-documented software.
- Collaborate with architects, analysts, QA, infrastructure teams, and business stakeholders on technical design and solution delivery.
- Contribute to application modernization and migration of legacy systems to modern Azure-based platforms.

Deliverables include, but are not limited to:

- Develop functionalities per business requirements.
- Migrate applications from .NET Framework 4.x to .NET Core/.NET.
- Design, develop, and implement secure RESTful APIs.
- Develop modern Angular web front-ends and migrate existing AngularJS applications to Angular.
- Develop and optimize data access and database operations, including query and performance optimization.
- Conduct performance testing and tuning to improve application scalability, responsiveness, and reliability.
- Implement and enhance application security,



including authentication, authorization, and secure API practices.

Must Haves:

- Modernization & Legacy Transformation Experience: Demonstrated experience decomposing monolithic applications into modular services, APIs, or microservices. Experience developing modernization roadmaps and executing phased migrations with minimal business disruption.
- .NET Core / Backend Engineering Expertise: Advanced expertise in ASP.NET Core, REST API development, dependency injection, authentication/authorization, performance optimization, and enterprise application architecture.
- Angular Front-End Development Expertise: Experience designing and developing Angular applications, component-based architecture, state management, responsive UI design, and integration with REST services.
- Solution Architecture & Design Skills: Ability to design scalable, maintainable, secure, and loosely coupled solutions. Experience with DDD, API-first design, event-driven architecture, integration patterns, and modular architecture.

Additional Qualifications and Experience:

- C# / .NET Development
- 10 years of hands-on experience developing enterprise applications using C#, .NET Core/ASP.NET Core, and ASP.NET Framework 3.5/4.x, including modernization of legacy .NET applications.
- REST API Development & Security
- Strong experience designing, developing, integrating, and troubleshooting RESTful APIs, including JWT, OAuth2, authentication, and authorization.
- Angular / Front-End Development
- Strong experience with AngularJS, JavaScript, HTML, CSS, jQuery, and ASP.NET MVC, with experience migrating legacy AngularJS applications to modern Angular preferred.
- Microsoft SQL Server & Database Development
- Strong T-SQL development skills, including stored procedures, views,



triggers, indexing, query optimization, execution plans, and database performance tuning.
- Microsoft Azure Cloud Development
- Hands-on experience with Azure App Service, Azure SQL Managed Instance, Azure Storage, Event Hub, Azure Data Explorer (ADX), Key Vault, Application Insights, and Azure Monitor.
- Azure DevOps & Git
- Experience with Azure DevOps, CI/CD pipelines, automated deployments, release management, GitHub, and/or Azure Repos.
- Performance, Multithreading & Scalability
- Strong experience with multithreaded and asynchronous programming, parallel processing, application performance optimization, and scalability across application and database layers.
- Production Troubleshooting & Testing
- Robust troubleshooting and root-cause analysis skills using KQL, Postman, SoapUI, Swagger/OpenAPI, IIS, application logs, monitoring tools, and database diagnostics.
- Legacy Application Modernization
- Experience maintaining and modernizing ASP.NET Framework, Windows Services, WCF/Web Services, Windows Forms, and IIS-hosted applications; Tomcat troubleshooting is anasset.
- Software Engineering & Architecture
- Strong knowledge of object-oriented programming, design patterns, software architecture, SDLC, Agile/Scrum, code reviews, clean code, and secure/maintainable software development practices.

Desired Skills:

- Healthcare System Integration: Experience developing and supporting integrations between healthcare applications and systems.
- HL7: Familiarity with HL7 standards and healthcare messaging, including experience troubleshooting HL7 interfaces.
- FHIR: Knowledge of FHIR standards, resources, APIs, and modern healthcare interoperability.
- Mirth Connect: Hands-on experience developing, configuring, monitoring, and troubleshooting Mirth Connect channels and integrations.

We appreciate all interest; however, only candidates whose experience fully meets the posted requirements will be considered.

Interested?

If you meet the above criteria apply now!

AI is not being used in the application/recruitment process for this position

📌 Senior Full Stack Developer (Toronto)
🏢 StafinGo
📍 Toronto