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Added 5 days ago
R&
Java Developer/Java Full Stack Developer III
Robertson & Company Ltd.
Toronto, ON
- Contract
Robertson is seeking a skilled Java Developer/Java Full Stack Developer III to join our client in support of an existing vacancy.
Added 5 days ago
E
Senior Software Engineer
EarnIn
Vancouver, BC
- Full-time
Proficient in at least one modern programming language, such as Kotlin, Java, C#, Go, Python, or TypeScript, and able to work in more than one.
Added 5 days ago
FI
Senior Full Stack Software Developer (FHIR)
Flexstaf I.T. Inc.
Toronto, ON · Greater Toronto Area, Canada
- Contract
Position: Software Developer - Full Stack – Senior
Added 5 days ago
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Full Stack Developer (Java/Python + Gen AI)
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Brampton, ON
- Contract
Role Description This is a contract Full Stack Developer (Java/Python + Gen AI) role based in Brampton, ON with a hybrid work arrangement, allowing a mix of on-site and work-from-home days.…
Added 5 days ago
F
Staff Frontend Engineer
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- Full-time
Improve frontend performance, reliability, accessibility, testing strategy, and developer experience at a systems level.
Added 5 days ago
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Sr. Java Fullstack Developer-Angular/Banking
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- $59.48 to $79.66 CAD / hour
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Working with one of our top financial clients, this role calls for a Sr. Java Fullstack Developer-Angular/Banking to join a collaborative Agile delivery pod supporting a large-scale…
Added 5 days ago
VS
Senior Software Developer
vTech Solution Canada
Toronto, ON
- Contract
Job Title: Sr. Software Developer - Full Stack
Added 5 days ago
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Software Engineer II - Angular UI
TD
Toronto, ON
- Full-time
Added 5 days ago
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Senior Java Developer - Vice President
Citi
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- Full-time
As a Senior Java Developer, you will design and deliver microservices solutions that power global reference data used by clients across Citi. Working within a global engineering…
Added 5 days ago
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Equity Application Support Analyst - Investment Banking
Tech Talent International
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- $100,000 to $120,000 CAD / year
- Full-time
Develop, test, and maintain applications using Java, Angular, Spring Boot, and related technologies.
Added 5 days ago
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Production Support Specialist
Hays
Montreal, QC
- Contract
Experience with software development and automation initiatives using scripting languages such as Bash and Python or programming languages including C, C#, Java, Scala, and Go.
Added 5 days ago
RD
Senior Java Software Developer
Randstad Digital
London, ON
- $65 to $75 CAD / hour
- Contract
Our client, is seeking an experienced, highly collaborative Software Developer - Java to join their AI & Open Data Enablement engineering group.
Added 5 days ago
JG
Ab-initio Developer - 8 Years
J2B Global LLC
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- Full-time
Data lineage, application development, python or Java coding experience
Added 5 days ago
A
Java Spark Backend Developer
Apptad
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…solutions. The ideal candidate should have strong expertise in Java, SQL, database systems, and Python, along with a willingness to learn and adapt to new…
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Software Engineer - QC(Local)
Yochana
Montreal, QC
- Contract
We are seeking a Software Engineer with strong Java development experience to support the security, modernization, and reliability of enterprise applications and file transfer platforms.…
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Full Stack Java Developer
Global Technical Talent, an Inc. 5000 Company
Toronto, ON
- $55 to $65 CAD / hour
- Contract
Added 5 days ago
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Full Stack Engineer
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Toronto, ON
- $100,000 to $120,000 CAD / year
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Advanced experience as a Fullstack Developer, with hands-on expertise in Java Spring Boot and
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AVP Senior Java Developer
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Mississauga, ON
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The Senior Java Developer is an intermediate level position responsible for participation in the establishment and implementation of new or revised application systems and programs in…
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Software/Firmware Development Engineer
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Software programming languages such as C, C++, Java, Python.
Added 5 days ago
HO
Full-Stack Developer (Digital Product Developer)
House of Commons (Canada) / Chambre des communes (Canada)
Ottawa, ON
- Full-time
The House of Commons’ Digital Services and Real Property (DSRP) is currently looking to staff several Full-Stack Developer (Digital Product Developer) positions.
Added 5 days ago
HO
Senior Full-Stack Developer (Senior Digital Product Developer)
House of Commons (Canada) / Chambre des communes (Canada)
Ottawa, ON
- Full-time
The House of Commons’ Digital Services and Real Property (DSRP) is currently looking to staff the Senior Full-Stack Developer (Senior Digital Product Developer) position.
Added 5 days ago
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Senior Full-Stack Developer (Senior Digital Product Developer)
House of Commons of Canada Chambre des communes du Canada
Ottawa, ON
- Full-time
The House of Commons’ Digital Services and Real Property (DSRP) is currently looking to staff the Senior Full-Stack Developer (Senior Digital Product Developer) position.
Added 5 days ago
UO
Scientific Assistant
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Experience with computer programming languages such as Python, Java Script, C, C++.
Added 5 days ago
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Full-Stack Developer (Digital Product Developer)
House of Commons of Canada Chambre des communes du Canada
Ottawa, ON
- Full-time
The House of Commons’ Digital Services and Real Property (DSRP) is currently looking to staff several Full-Stack Developer (Digital Product Developer) positions.
Added 5 days ago
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Java Python Senior Software Developer
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- Full-time
Working primarily in Java or Python to drive critical initiatives within Elsevier’s Research Data Platform (RDP)

vTech Solution Canada

Senior Software Developer

Toronto, ON, Canada

Contract

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Job details

Job type: Contract
Apply by: Nov 29, 2026
Posting language: English
Posted: Oct 30, 2026

Original job description

Job Title: Sr. Software Developer - Full Stack

Location: Toronto, ON

Work Mode: Hybrid (Onsite as needed basis)

Duration: 6 months contract

Description:

The Agency requires 2 Senior Full Stack Developers to support the Enterprise Pub/Sub Applications Team. The resources will update The Agency applications and associated workflows to integrate with the Agency Enterprise Pub/Sub service, which is based heavily on FHIR Subscription and SubscriptionTopic. The work will replace scheduled polling with subscription-driven event processing where appropriate so applications can respond when clinical information, referrals, reports, status changes, or other relevant events become available. The roles spans FHIR event architecture, backend, serverless integration, interface, and user-interface development. The resource will define and implement FHIR Subscription and SubscriptionTopic behaviour; build Java and Node.js services, AWS Lambda functions, and queue-based event-processing components; develop React applications that use SMART on FHIR; and configure NextGen Connect (Mirth) channels for HL7 v2 workflows. The work includes subscription lifecycle management, filtering, notification handling, application and workflow changes, testing, monitoring, and transition of existing polling processes.

Required Skills:

Strong hands-on experience with FHIR Subscription and SubscriptionTopic, including topic definitions, resource triggers, filter criteria, subscription status and lifecycle, notification Bundles, delivery channels, heartbeat notifications, and event retrieval.
Senior-level experience developing Java and Node.js services, REST APIs, FHIR integrations, event publishers and consumers, and production application logic.
Strong experience implementing FHIR Subscription and SubscriptionTopic workflows with AWS Lambda and asynchronous queues, including notification Bundle handling, retries, dead-letter handling, idempotency, concurrency, duplicate-event handling, and replay.
Strong React development experience building production applications that use SMART on FHIR launch, authorization, context, scopes, and FHIR API integration patterns.
Hands-on experience with NextGen Connect (Mirth), HL7 v2 integration, and Ontario digital health standards and provincial services, including the Hospital Report Manager (HRM) Standard, Provider Registry, Client Registry, and eReferral, covering message transformation, validation, routing, acknowledgements, error handling, conformance testing, and production support.

Responsibilities:

Assess polling-based integrations and workflows, identify the clinical or application events that should trigger notifications, and map each workflow to the appropriate FHIR SubscriptionTopic and Subscription behaviour.
Define, implement, and maintain SubscriptionTopic resources, including supported resource triggers, event definitions, filter parameters, notification shapes, and conformance requirements.
Implement Subscription creation, validation, activation, status management, renewal, deactivation, delivery configuration, heartbeat handling, event retrieval, and subscriber lifecycle controls.
Design, develop, test, and support Java and Node.js services that publish events, manage subscriptions, consume notification Bundles, call FHIR APIs, and route resulting actions to application workflows.
Develop and maintain AWS Lambda functions and queue-based integrations for asynchronous event processing, validation, enrichment, workflow coordination, and downstream application updates.
Implement reliable processing controls for idempotency, duplicate detection, retries, dead-letter handling, controlled concurrency, ordering where required, reconciliation, replay, and recovery.
Develop and support React applications that use SMART on FHIR to present subscription-related workflows, launch within supported contexts, obtain authorized FHIR access, and interact with FHIR resources and application APIs.
Develop and maintain NextGen Connect (Mirth) channels that receive, transform, validate, route, and acknowledge HL7 v2 messages and connect those workflows to FHIR resources, application services, and Enterprise Pub/Sub events.
Validate Subscription, SubscriptionTopic, notification Bundle, and related FHIR resource instances against the applicable FHIR definitions, The Agency profiles, terminology, and business rules.
Implement event correlation, structured logging, metrics, alerts, audit records, subscription health monitoring, and operational dashboards so teams can trace processing across publishers, Enterprise Pub/Sub, subscribers, and downstream applications.
Create and maintain unit, integration, contract, conformance, interface, regression, end-to-end, performance, and failure-recovery tests covering FHIR subscription workflows, backend services, serverless processing, HL7 v2, and React components.
Apply secure configuration, authentication, authorization, least-privilege access, privacy-aware logging, and appropriate handling of personal health information, and prepare technical designs, mappings, runbooks, and knowledge-transfer materials with project stakeholders.

Desired Skills:

Experience implementing the FHIR R5 Subscription model or the R5 subscription backport for earlier FHIR releases, including SubscriptionTopic, rest-hook or websocket delivery, status notifications, heartbeat notifications, and event retrieval.
Experience with AWS messaging, integration, and observability services such as Amazon SQS, Amazon SNS, Amazon EventBridge, Amazon API Gateway, and Amazon CloudWatch.
Experience with infrastructure as code, automated build and deployment pipelines, containerized workloads, configuration management, and automated security scanning.
Experience defining versioned FHIR profiles, event schemas, interface contracts, compatibility rules, correlation identifiers, and governance practices for shared enterprise integrations.
Experience using NextGen Connect (Mirth) to integrate with Ontario digital health standards and provincial services, including the Hospital Report Manager (HRM) Standard, Provider Registry, Client Registry, and eReferral, with hands-on responsibility for HL7 v2 transformation, validation, routing, acknowledgements, conformance testing, and production support.

Required Competencies:

Advanced FHIR Subscription and SubscriptionTopic experience, including resource triggers, filter criteria, lifecycle and status management, notification Bundles, delivery channels, heartbeat notifications, event retrieval, validation, and conformance testing.
FHIR Subscription and SubscriptionTopic implementation experience for event-driven clinical workflows, including topic and event design, subscription filters and lifecycle management, notification Bundle processing, asynchronous queue processing, idempotency, retries, dead-letter handling, duplicate-event handling, observability, replay, and production troubleshooting using Java, Node.js, and AWS Lambda.
React and SMART on FHIR experience, including launch and authorization flows, scopes, context handling, FHIR API integration, accessible user-interface development, automated testing, and secure handling of clinical information.
NextGen Connect (Mirth), HL7 v2, and Ontario digital health standards experience, including the Hospital Report Manager (HRM) Standard, Provider Registry, Client Registry, and eReferral, covering message transformation, validation, routing, acknowledgements, error handling, interface and conformance testing, production support, and integration with FHIR, Java, Node.js, or serverless components.

Rated Criteria:

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. 25 Points
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. 25 Points
React and SMART on FHIR experience, including launch and authorization flows, scopes, context handling, FHIR API integration, accessible user-interface development, and testing. 25 Points
NextGen Connect (Mirth) and HL7 v2 integration experience, including transformation, validation, routing, acknowledgements, error handling, interface testing, and integration with Ontario digital health standards and provincial services such as the Hospital Report Manager (HRM) Standard, Provider Registry, Client Registry, and eReferral. 25 Points

Total: 100 Points

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More about this job

Responsibilities

Design and implement FHIR Subscription and SubscriptionTopic workflows, Java and Node.js services, AWS Lambda and queue-based event processing, React applications using SMART on FHIR, and HL7 v2 integrations through NextGen Connect. Test, monitor, secure, and support these integrations, including reliable event handling, clinical workflow updates, operational documentation, and transition from polling-based processes.

Requirements

Requires advanced hands-on experience with FHIR Subscription and SubscriptionTopic, Java and Node.js development, AWS Lambda and asynchronous event processing, and production React applications using SMART on FHIR. Also requires NextGen Connect (Mirth), HL7 v2, and Ontario digital health integration experience, including HRM, Provider Registry, Client Registry, and eReferral.

Skills

FHIR Subscriptions
FHIR SubscriptionTopic
Java
Node.js
AWS Lambda
Asynchronous Queues
React
SMART on FHIR
HL7 v2
NextGen Connect (Mirth)
REST APIs
Event-Driven Architecture
AWS Messaging Services
FHIR Integration
Ontario Digital Health Standards
Automated Testing

Visa sponsorship

Not detected in the job text

Keywords

FHIR
FHIR Subscription
SubscriptionTopic
FHIR R5
Java
Node.js
React
SMART on FHIR
AWS Lambda
Amazon SQS
Amazon SNS
Amazon EventBridge
Amazon API Gateway
Amazon CloudWatch
HL7 v2
NextGen Connect
Mirth
REST APIs
Notification Bundles
Event-Driven Architecture
Asynchronous Queues
Idempotency
Dead-Letter Handling
Hospital Report Manager
Provider Registry
Client Registry
eReferral
Ontario Digital Health Standards
Personal Health Information
Infrastructure as Code

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