IT Sr Manager, Applications Engineering - Legacy Systems

Job Description:

The IT Integrations Manager is responsible for leading the design, delivery, and modernization of enterprise integrations across both legacy (mainframe) systems and modern application platforms.

This role will initially oversee a team supporting mainframe-based integrations, ensuring stability, reliability, and continuity of business-critical data flows. In parallel, the role will transition into leading a modern enterprise integrations and .NET development team, driving API-based integrations, data platform connectivity, and reporting/analytics enablement (e.g., Power BI).

This leader will play a key role in bridging legacy and future-state architectures, enabling the organization's transition toward a scalable, cloud-enabled integration and data ecosystem.

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