Senior Full Stack - Software Developer

Position: Senior Full Stack - Software Developer

Duration: 5 Months assignment (contract)
Client Location: Toronto (Onsite/Hybrid: 7.25 hours/day between 8:00 AM and 5:00 PM, Monday to Friday)
Engagement Model: Professional Services Engagement – B2B (Incorporated Entities Only)

Note on Assignment Type

This position is provisionally Onsite/Hybrid, requiring 7.25 hours per calendar day between 8:00 AM and 5:00 PM, Monday to Friday (excluding breaks). Conditions may change based on organizational requirements and at the discretion of the Hiring Manager.

About the Engagement

Akkodis is seeking experienced Senior Full Stack - Software Developer to support enterprise event-driven healthcare integration initiatives.

The successful consultants will play a key role in modernizing application workflows through the implementation of FHIR Subscription and SubscriptionTopic capabilities, replacing polling-based integrations with real-time event-driven processing solutions.

This role requires deep expertise across healthcare interoperability, backend and frontend application development, serverless technologies, cloud services, integration platforms, and enterprise messaging architectures. Successful candidates will design, implement, and support FHIR-based event processing solutions utilizing Java, Node.js, AWS Lambda, React, SMART on FHIR, NextGen Connect (Mirth), and HL7 v2 standards.

Scope

• Assess existing polling-based workflows and identify opportunities for event-driven processing.

• Design and implement FHIR Subscription and SubscriptionTopic solutions for clinical and business workflows.

• Build and support Java and Node.js services, APIs, event publishers, event consumers, and integration components.

• Develop AWS Lambda functions and asynchronous queue-processing solutions.

• Support enterprise event architecture and integration modernization initiatives.

Assignment Deliverables

• FHIR SubscriptionTopic definitions, event triggers, filtering rules, notification specifications, and conformance documentation.

• Subscription lifecycle management components supporting creation, validation, activation, renewal, deactivation, event retrieval, and subscriber management.

• Updated enterprise applications and workflows leveraging subscription-driven event processing.

• Production-ready Java and Node.js services, APIs, integration adapters, publishers, and consumers.

Expertise Required

Must Have:

• Advanced FHIR Subscription and SubscriptionTopic experience, including resource triggers, filters, lifecycle and status management, notification Bundles, delivery channels, heartbeat notifications, event retrieval, validation, and conformance testing.

• Demonstrated FHIR Subscription and SubscriptionTopic implementation experience using Java, Node.js, AWS Lambda, and asynchronous queues, including topic and event design, subscription filters and lifecycle management, notification Bundle processing, idempotency, retries, dead-letter handling, duplicate-event handling, replay, observability, and production troubleshooting.

• React and SMART on FHIR experience, including launch and authorization flows, scopes, context handling, FHIR API integration, accessible user-interface development, and testing.

• NextGen Connect (Mirth) and HL7 v2 integration experience, including transformation, validation, routing, acknowledgements, error handling, interface testing, and integration with digital health standards and provincial services such as the Hospital Report Manager (HRM) Standard, Provider Registry, Client Registry, and eReferral.

Nice to Have:

• Experience building CI/CD pipelines and deployment automation.

• Experience with Infrastructure as Code (IaC).

• Experience with automated security scanning and secure software delivery practices.

Security Clearance

Required.

Important

This is a business-to-business engagement. Candidates must represent an incorporated entity, hold a valid business number, maintain appropriate insurance, and invoice for services rendered.

How to Apply

Submit your resume in confidence via the Akkodis Canada website.

We thank all applicants for their interest in this opportunity. Only candidates meeting the above qualifications will be contacted for further discussions.

Accessibility:

At Akkodis, part of The Adecco Group, our purpose is simple: to make the future work for everyone. We live our values, Passion, Collaboration, Inclusion, Courage, and Customers at Heart, by fostering a workplace where diversity is celebrated and every voice matter. We encourage applications from individuals of all backgrounds and identities. Together, we’re making the future work for everyone.