Software engineer senior H/F (IT)

We are seeking a highly experienced Senior Software Developer to join our team in a mission-critical capacity. In this role, you will be responsible for the sustainment, integration, and modernization of complex public health digital assets. This is an ideal role for a developer who excels at solving complex integration challenges, performance tuning, and leading technical solutions that support vital health information services for thousands of clients.
Contract Duration: 15-month contract with potential for contract extension
Schedule: Monday to Friday, 7.25 hours per day (8:00 AM – 5:00 PM)
High-Impact Work: Contribute directly to essential public health digital infrastructure.
Technical Depth: Work on a sophisticated, multi-tier stack involving legacy and modern cloud-native technologies.
A long-term 15-month contract with potential for extension.
Professional Collaboration: Join a team that values rigorous technical standards and modern development practices.

Provide ongoing programming support for incident management, application functionality, and API management.
Develop secure integration components to connect provincial digital health assets with third-party consumer applications.
Perform impact analysis, effort estimation, and solution design for software upgrades and business requirement changes.
Development & Technical Engineering
Design data-driven logic and conduct unit tests for integration hubs and connected services.
Fix issues within API layers to ensure immunization data is accurate and synchronized across systems.
Perform performance tuning to ensure high-volume data handling across all external sources.
Translate technical system specifications into clean, working, and tested code.
Develop and maintain system design models, technical documentation, and specifications in alignment with enterprise standards.
Work closely with Quality Assurance (QA) specialists and Solutions Designers to code, test, and debug integration services.
Maintain development environments and adopt Continuous Integration (CI) and DevOps practices.
Provide technical expertise on computing platforms, operating systems, and middleware.
Experience: 10+ years of professional experience in full-stack analysis, design, and development within large, complex mission-critical environments.
Extensive experience with Java/Java EE, RESTful web services, API management, and integration protocols (HL7-FHIR, JSON, XML).
Frontend: Expert knowledge of modern UI frameworks (Angular, JavaScript, HTML5, CSS, JSF, PrimeFaces).
Data Management: Proficiency with Oracle (19c), SQL, PL/SQL, ETL, stored procedures, and database performance tuning.
Cloud & DevOps: Strong understanding of Docker, Kubernetes, CI/CD pipelines, and cloud technologies.
Demonstrated experience working with provincial/federal public-sector healthcare providers or clinical IT systems (registries, immunization systems).
Technical Standards: ability to translate business requirements into technical designs effectively.
If you're interested in the Senior Software Developer - Full Stack role based in Toronto, we encourage you to apply online at Only qualified candidates will be contacted for the next steps. 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 View email address on randstad.com.