Senior Developer (.NET/Angular)

Location: Toronto, ON, Hybrid (3 days on-site per week)
Language: Excellent written and verbal English communication skills
Duration: 1-year contract
Background Check Requirement: Successful completion of a criminal background check may be required.

About the Opportunity
Join a large public sector digital transformation initiative focused on modernizing critical home and community care technology. As a Senior Software Developer, you will play a key role in transforming legacy enterprise applications into scalable, cloud-enabled solutions that improve the delivery of essential services across Ontario.

Working alongside architects, business analysts, QA professionals, and development teams, you will help design and deliver secure, high-performing applications using modern Microsoft technologies. This is an opportunity to contribute to a multi-year modernization program while influencing architecture, mentoring peers, and delivering meaningful technology solutions.

What's In It for You
Work on a large-scale modernization program using the latest Microsoft and Azure technologies while helping shape the future of enterprise application development. You'll join a collaborative environment that values innovation, knowledge sharing, and continuous improvement, offering exposure to complex technical challenges and opportunities for professional growth.

Your Responsibilities
• You'll design, develop, test, deploy, and maintain enterprise applications using C#, .NET Core, ASP.NET Core, Angular, JavaScript, and related technologies.
• You'll modernize legacy .NET Framework, WCF, Windows Services, Windows Forms, and IIS-hosted applications by decomposing monolithic systems into modular, API-driven solutions.
• You'll build secure REST APIs, implement JWT and OAuth2 authentication, and develop scalable, high-performance applications using asynchronous and multithreaded programming.
• You'll develop and optimize Microsoft SQL Server databases while supporting Azure App Services, Azure SQL, Storage, Event Hub, Azure Data Explorer, Key Vault, Application Insights, and Azure Monitor.
• You'll support Azure DevOps CI/CD pipelines, perform code reviews, troubleshoot production issues, and collaborate with cross-functional teams to deliver secure, maintainable software solutions.

Skills and Qualifications
• 10+ years of enterprise software development experience using C#, .NET Core, ASP.NET Core, and legacy ASP.NET Framework technologies.
• Demonstrated experience modernizing legacy applications, designing REST APIs, and implementing secure authentication and authorization using JWT and OAuth2.
• Strong experience developing Angular applications, including AngularJS migration, JavaScript, HTML, CSS, jQuery, component-based architecture, and responsive user interfaces.
• Advanced Microsoft SQL Server expertise, including T-SQL, stored procedures, indexing, query optimization, execution plans, and database performance tuning.
• Hands-on experience with Microsoft Azure services, Azure DevOps, Git, CI/CD pipelines, application monitoring, and cloud-native development.
• Strong understanding of software architecture, Domain-Driven Design (DDD), API-first design, event-driven architecture, design patterns, Agile delivery, and secure software engineering practices.
• Experience developing and supporting integrations between healthcare applications and systems.
• Familiarity with HL7 standards and healthcare messaging, including troubleshooting HL7 interfaces.
• Knowledge of FHIR standards, resources, APIs, and modern healthcare interoperability.
• Hands-on experience developing, configuring, monitoring, and troubleshooting Mirth Connect channels and integrations is considered a strong asset.

Why Partner with Altis
If you’ve never worked with a staffing agency before, we make it easy. We work with top employers across Canada who have great jobs to fill, each vetted and verified by our team. When you apply for a job with Altis, we get to know you as a candidate and learn what your strengths are. Then, if you’re a solid match, we handle all the logistics, advocating for you as a candidate for the role, providing access to coaching and connecting you directly with the hiring manager. And rest assured, all our services are free of cost for candidates.

We appreciate the time and effort all applicants invest in their submissions. Please note that only candidates shortlisted for this role will be contacted directly. However, your profile will remain under consideration for future opportunities that align with your experience and career goals.All qualified applicants will receive fair consideration for employment. We welcome individuals of all backgrounds, experiences, and identities including those who identify as women, members of racialized groups, Indigenous Peoples, persons with disabilities, and 2SLGBTQIA+ communities. If you require an accommodation, please review our accessibility policy and reach out to our accessibility officer with any questions. Our human recruiters review all applications and always make the final hiring decision. On occasion, we also use AI-assisted tools to help review applications.