senior middleware specialist.

We are seeking a highly accomplished Senior Middleware Specialist for an enterprise-level contract opportunity based in Toronto. In this role, you will take on a premier engineering and architectural capacity within middleware, platform integration, and cloud modernization streams, specializing in maintaining robust enterprise integration engines and migrating legacy workflows to cloud-native architectures.

As a principal middleware authority, you will bridge the gap between complex on-premises systems, hybrid cloud infrastructure, and modern Azure integration suites. Operating within a hybrid work model, you will support and optimize BizTalk Server integrations across enterprise platforms (including SAP, SuccessFactors, and Maximo), architect Azure Logic Apps workflows, engineer automated CI/CD pipelines, and enforce strict security, performance, and monitoring baselines. This position demands a seasoned integration specialist who can lead defect triage, perform root-cause analysis, and build maintainable, secure middleware solutions.

Location: Toronto, ON

Assignment Type: Hybrid (Minimum 2 days per week onsite)

Contract Duration: 1-year contract (with potential for extension)

Advantages
High-Impact Cloud Migration: Lead the modern transformation of legacy BizTalk Server integrations to Azure Integration Services and Azure Logic Apps.

Complex Multi-System Ecosystem: Connect core enterprise platforms across SAP, SuccessFactors, Maximo, and cloud services.

Modern Azure Integration Stack: Expand technical depth using Azure Logic Apps, Azure Functions, API Management, Service Bus, and Azure DevOps.

Collaborative Hybrid Model: Enjoy a flexible working arrangement combining onsite teamwork in Toronto with remote flexibility.

Responsibilities
Support, maintain, and optimize BizTalk Server orchestrations, pipelines, maps, schemas, and adapters across enterprise platforms.

Design, build, test, deploy, and support Azure Logic Apps (Standard and Consumption) workflows and cloud integration services.

Migrate legacy BizTalk integration workflows to modern Azure Integration Services, Azure Logic Apps, and API-driven architectures.

Monitor integration health, performance, message tracking, error-handling mechanisms, and retry logic across hybrid environments.

Develop complex data transformations utilizing XML, XSLT, JSON, and Liquid templates.

Configure enterprise adapters and connectivity components, including WCF-SAP, WCF-Custom, REST, SFTP, API Management, gateways, and hybrid connections.

Build, modernize, and maintain custom C#, .NET, and SQL Server stored procedures and supporting integration components.

Maintain version control branching strategies in Git and build automated CI/CD pipelines within Azure DevOps using Bicep templates and YAML configurations.

Implement cloud security controls, including OAuth2, SSL certificates, Azure Key Vault, Microsoft Entra ID, managed identities, and role-based access controls (RBAC).

Support Systems Integration Testing (SIT), User Acceptance Testing (UAT), performance testing, root-cause troubleshooting, defect triage, and non-functional requirement validation.

Partner with cross-functional teams, Enterprise Architecture, QA leads, and vendors to resolve integration bottlenecks and ensure governance compliance.

Create and update technical design artifacts, interface inventories, mapping specifications, deployment plans, and knowledge-transfer documentation.

Qualifications
Core Technical & Middleware Experience
Education: Post-secondary degree or diploma in Computer Science, Computer Engineering, or an equivalent combination of education and professional experience.

Enterprise Integration Tenure: 10+ years of enterprise systems integration experience utilizing .NET, C#, Web API, XML, XSLT, JSON, SQL Server, T-SQL, and stored procedures.

BizTalk Server Expertise: Strong hands-on experience with BizTalk Server (including BizTalk 2020), orchestrations, pipelines, maps, schemas, adapters, and cloud migration strategies.

Protocol & Connectivity Depth: Deep experience working with WCF-Custom, WCF-SAP, SFTP, REST, BAPIs, IDocs, APIs, and enterprise integration patterns.

Azure Logic Apps Depth: Minimum 4 years of hands-on experience building, testing, and deploying Azure Logic Apps.

Azure Cloud Services: Hands-on experience with Azure Functions, Service Bus, API Management, Cosmos DB, Azure Data Factory, Azure Storage, Azure Monitor, Application Insights, and Log Analytics.

DevOps & CI/CD Pipelines: Proficiency with Git version control (branching, PR reviews) and constructing automated CI/CD deployment pipelines in Azure DevOps.

Cloud Security Frameworks: Solid understanding of OAuth2, certificates, Azure Key Vault, Microsoft Entra ID, managed identities, and role-based access control.

Preferred Assets
Microsoft Certification: Active Microsoft Certified: Azure Developer Associate credential is preferred.

Summary
If you're interested in the "Senior Middleware Specialist" role based in Toronto, we encourage you to apply online at
Only qualified candidates will be contacted for the next steps. We look forward to hearing from you!

Randstad Canada is committed to fostering a workforce reflective of all peoples of Canada. 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 to ensure their ability to fully participate in the interview process.

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