Job Summary: The Senior Full Stack Software Developer will support the Enterprise Pub/Sub Applications Team by developing and enhancing applications that integrate with the Agency s Enterprise Pub/Sub service based on FHIR Subscription and Subscription

Topic.

This role involves designing event-driven clinical workflows, replacing polling with subscription-driven event processing, and developing backend, serverless, interface, and user-interface components using Java, Node.js, AWS Lambda, React, and Next

Gen Connect (Mirth) for HL7 v2 integration.

Responsibilities: Assess polling-based integrations and map workflows to appropriate FHIR Subscription

Topic and Subscription behaviors.

Define, implement, and maintain Subscription

Topic resources including triggers, filters, notification shapes, and conformance requirements.

Manage subscription lifecycle including creation, validation, activation, status management, renewal, and deactivation.

Design, develop, test, and support Java and Node.js services for event publishing, subscription management, notification consumption, and workflow routing.

Develop AWS Lambda functions and queue-based integrations for asynchronous event processing and downstream updates.

Implement reliable processing controls such as idempotency, retries, dead-letter handling, concurrency control, and replay mechanisms.

Develop React applications utilizing SMART on FHIR for subscription-related workflows and secure FHIR API integration.

Develop and maintain Next

Gen Connect (Mirth) channels for HL7 v2 message processing and integration with FHIR and Enterprise Pub/Sub events.

Validate FHIR resources against definitions, profiles, terminology, and business rules.

Implement observability features including logging, metrics, alerts, dashboards, and subscription health monitoring.

Create comprehensive testing suites covering unit, integration, contract, conformance, regression, and performance tests.

Ensure secure configuration, authentication, authorization, privacy-aware logging, and proper handling of personal health information.

Prepare technical documentation, runbooks, and knowledge-transfer materials for project stakeholders.

Required Skills:



Advanced expertise in FHIR Subscription and Subscription

Topic including resource triggers, filters, lifecycle and status management, notification Bundles, delivery channels, heartbeat notifications, event retrieval, validation, and conformance testing.

Senior-level development experience with Java and Node.js for REST APIs, FHIR integrations, event-driven workflows, and production application logic.

Proficient in AWS Lambda and asynchronous queue processing with robust handling of retries, dead-letter queues, idempotency, concurrency, and event replay.

Solid React development skills with SMART on FHIR launch, authorization, context, scopes, and FHIR API integration.

Hands-on experience with Next

Gen Connect (Mirth), HL7 v2 integration, and Ontario digital health standards including Hospital Report Manager (HRM), Provider Registry, Client Registry, and eReferral.

Desired Skills: Experience with FHIR R5 Subscription model or backports for earlier FHIR versions, including rest-hook or websocket delivery.

Familiarity with AWS messaging and observability services such as Amazon SQS, SNS, Event

Bridge, API Gateway, and Cloud

Watch.

Knowledge of infrastructure as code, automated build and deployment pipelines, containerization, configuration management, and automated security scanning.

Experience defining versioned FHIR profiles, event schemas, interface contracts, compatibility rules, and governance practices for enterprise integrations.

Advanced skills in HL7 v2 message transformation, validation, routing, acknowledgements, error handling, conformance testing, and production support.

Rated Criteria: Advanced FHIR Subscription and Subscription

Topic expertise - 25 Points Implementation experience with Java, Node.js, AWS Lambda,



and asynchronous queues - 25 Points React and SMART on FHIR development skills - 25 Points Next

Gen Connect (Mirth) and HL7 v2 integration experience with Ontario digital health standards - 25 Points Total: 100 Points Deliverables: FHIR Subscription

Topic definitions and documentation of event triggers, filters, notification content, delivery expectations, and conformance rules.

Subscription lifecycle management components including creation, validation, activation, renewal, deactivation, and heartbeat handling.

Updated applications and workflows integrating Enterprise Pub/Sub event-driven processing replacing polling-based processes.

Production-ready Java and Node.js services, APIs, event publishers, consumers, adapters, and integration components. AWS Lambda functions and queue-based processing components for validation, enrichment, retries, dead-letter handling, and replay.

React components implementing SMART on FHIR launch, authorization, context, scopes, and FHIR API interactions.

Next

Gen Connect (Mirth) channels for HL7 v2 ingestion, transformation, validation, routing, acknowledgements, and error management. FHIR profiles, validation rules, event and interface mappings, contract and conformance tests, integration and end-to-end test evidence.

Structured logs, metrics, alerts, dashboards, subscription health monitoring, audit records, reconciliation controls, incident diagnostics, and runbooks.

Technical designs, API and interface specifications, workflow documentation, security notes, deployment instructions, demonstrations, release-support materials, and knowledge-transfer artifacts.

Must Haves: Advanced FHIR Subscription and Subscription

Topic expertise including lifecycle and status management, notification Bundles, and conformance testing.

Proven implementation experience with Java, Node.js, AWS Lambda, asynchronous queues, and robust event processing controls.

Strong React and SMART on FHIR experience for secure and accessible user interfaces.

Extensive Next

Gen Connect (Mirth) and HL7 v2 integration skills aligned with Ontario digital health standards and provincial services.

Public Sector Experience: Must have

📌 Senior Full Stack Software Developer (Toronto)
🏢 vTech Solution
📍 Toronto