IT Sr Manager, Applications Engineering - Legacy Systems

Key Responsibilities 

1. Integration Strategy & Architecture 

• Define and execute the enterprise integration strategy spanning legacy and modern platforms 

• Establish integration patterns (APIs, messaging, ETL, event-driven) and standards

• Partner with Data & Analytics leadership to align integrations with data lake and reporting initiatives 

2. Legacy System Leadership (Interim) 

• Lead the team supporting mainframe/legacy integrations and interfaces

• Ensure stability, performance, and reliability of existing integrations 

• Document and rationalize current-state integrations and dependencies 

• Develop a roadmap for coexistence, simplification, and eventual decommissioning of legacy systems 

3. Modern Integration & .NET Leadership (Future State) 

• Transition into leadership of a .NET-based integrations and development team 

• Oversee development of APIs, services, and integration components (.NET, C#, Web APIs) 

• Drive modernization toward reusable, scalable integration services

• Align development efforts with enterprise architecture and cloud platform (Azure preferred)  

4. Data Platform & Reporting Integration 

• Enable integration with enterprise data platforms (data lake, Azure SQL, etc.)

• Support ingestion pipelines for analytics and reporting use cases 

• Collaborate with Power BI and analytics teams to deliver reliable, governed data flows 

• Improve data quality, consistency, and governance across systems  

5. Integration Delivery & Platform Management 

• Oversee APIs, middleware, ETL pipelines, and system interfaces 

• Manage integration lifecycle (design, build, deploy, monitor, optimize) 

• Ensure performance, scalability, and observability of integrations 

• Support SQL Server and data integration performance tuning  

6. Team Leadership & Transition Management 

Lead a hybrid team of: 

• Legacy/mainframe integration resources (short-term)

• Modern integration engineers and .NET developers (long-term) 

• Drive transition planning from legacy skillsets to modern integration capabilities 

• Manage Agile delivery, backlog prioritization, and capacity planning  

7. Governance, Security & Compliance 

• Establish integration governance, standards, and documentation practices 

• Ensure secure data movement and adherence to enterprise policies 

• Implement monitoring, logging, and auditing for integrations  

8. Stakeholder & Cross-Functional Collaboration 

Partner with:  

• Enterprise Applications 

• Data & Analytics teams 

• Business stakeholders 

• External vendors/partners 

• Act as the primary IT leader for integration-related initiatives and decisions  

Required Qualifications 

• 10+ years in IT with strong experience in systems integration and application development 

• Experience supporting legacy/mainframe systems and integrations

• Experience with modern integration technologies (APIs, ETL, middleware) 

• Strong background in .NET development (C#, ASP.NET, Web APIs) 

• Strong experience with SQL Server, ETL and data integration concepts

• Experience leading technical teams across both legacy and modern environments

• Familiarity with cloud platforms (Azure preferred)  

Preferred Qualifications 

• Experience integrating ERP platforms (SAP, D365, etc.) 

• Experience supporting data lake or analytics ecosystems 

• Experience with Power BI or enterprise reporting platforms 

• Experience with integration platform tools (iPaaS, messaging frameworks) 

Key Success Metrics 

• Stability and reliability of legacy integrations during transition

• Reduction in legacy integration complexity over time 

• Successful migration to modern API-based architecture 

• Improved availability and quality of data for reporting/analytics 

• Delivery velocity and quality of .NET integration services 

• Alignment between application, integration, and data strategies  

Position Impact 

• Ensures continuity of critical legacy operations 

• Enables transition to a modern, scalable integration architecture 

• Acts as a key bridge between enterprise applications, integrations, and analytics

• Directly supports AAON’s future-state data and reporting capabilities