Senior IBM AS400 / RPG Retail Application Consultant – Modernization & Support

Engagement: Senior Application Support, SME & Modernization Consulting

Experience: 15+ Years

Industry: Retail / Pharmacy / Multi-Store Retail

Position Overview

We are seeking a highly experienced Senior Retail Technology Consultant / Application SME with deep expertise in IBM AS400, RPG/RPGLE, CL/CLLE, DB2 for AS400 and SQL. The ideal candidate will provide senior-level L2/L3 application support for mission-critical retail applications while also contributing to legacy application modernization, migration, integration and transformation initiatives.

The successful candidate should have strong experience within large-scale retail or pharmacy environments, including knowledge of POS/store systems, merchandising, inventory, pricing, promotions, purchasing, replenishment, distribution, pharmacy operations and retail financial processes.

This role requires a hands-on, self-directed consultant who can independently troubleshoot complex production issues, perform root-cause analysis, assess legacy application landscapes, identify modernization opportunities and communicate recommendations directly to technical and business stakeholders.

Key Responsibilities

- Provide L2/L3 production support for IBM AS400-based retail applications.
- Troubleshoot complex incidents, batch failures, data issues, integrations and application problems.
- Perform root-cause analysis and develop sustainable solutions.
- Act as a senior AS400/RPG SME for legacy retail applications and business processes.
- Analyze application dependencies, interfaces, databases, batch processes and data flows.
- Assess legacy AS400 applications and identify modernization, migration, replacement and integration opportunities.
- Contribute to modernization roadmaps, migration strategies, transition approaches and target-state planning.
- Support legacy-to-cloud, platform migration,



application replacement and data migration initiatives.
- Work with architecture, development, infrastructure, data, integration and business teams.
- Lead technical discovery and application assessment sessions.
- Provide technical input for RFPs, solution evaluations, modernization business cases and vendor discussions.
- Communicate technical findings, risks, dependencies and recommendations to both technical and non-technical stakeholders.

Required Skills & Experience

- 15+ years of IT/Application experience with significant experience in retail technology.
- Extensive hands-on experience with IBM AS400 / IBM i environments.
- Strong expertise in RPG/RPGLE, CL/CLLE, DB2 for AS400 and SQL.
- Solid production support experience with mission-critical retail applications.
- Deep understanding of retail and multi-store business processes.
- Experience with application integrations, interfaces, batch processing and data flows.
- Demonstrated experience in application modernization, legacy migration, transformation or replacement initiatives.
- Ability to assess legacy applications and identify modernization options, risks, dependencies and trade-offs.
- Strong troubleshooting, analytical and root-cause analysis capabilities.
- Excellent stakeholder management, consulting and communication skills.
- Ability to work independently as a Senior Consultant / SME with minimal supervision.

Preferred Experience

- Experience with large Canadian or North American retailers.
- Pharmacy or healthcare retail technology experience.
- Experience with POS, merchandising, inventory, pricing, promotions, replenishment, purchasing or pharmacy systems.
- Experience integrating AS400 applications with APIs, cloud platforms, SaaS or modern enterprise platforms.
- Experience with legacy-to-cloud or legacy-to-modern-platform migrations.
- Experience creating application modernization roadmaps.
- Experience working with Enterprise Architecture teams.

📌 Senior IBM/ RPG Retail Application Consultant – Modernization & Support (Mississauga)
🏢 ThoughtStorm
📍 Mississauga