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Streamlining Technology: Large-Scale Application Decommissioning

Jarrad Plunkett
Principal Architect – SEEK

The Challenge

Following the successful unification of three major job platforms and enterprise technology stacks, SEEK faced a new challenge—managing a large number of legacy and high-risk applications across multiple jurisdictions. These outdated systems posed security, compliance, and operational risks, creating inefficiencies and increasing costs. SEEK needed an expert strategist to design and execute a seamless decommissioning plan while ensuring business continuity.

The Solution

Jarrad Plunkett was engaged as Principal Architect to lead the decommissioning effort. His role involved:

  • Identifying and assessing all remaining legacy applications

  • Developing a comprehensive decommissioning framework aligned with regulatory, security, and data privacy requirements

  • Creating a phased execution strategy to minimise business disruption

  • Ensuring a smooth transition while maintaining ongoing platform enhancements

The Outcome

  • Project delivered 12 months ahead of schedule—with all applications decommissioned in just 5 months

  • Zero disruption to ongoing business operations and software development

  • Significant cost savings through the removal of redundant infrastructure and licensing fees

  • A scalable, repeatable decommissioning framework to support future technology transitions

Why It Matters

This project highlights the critical role of experienced technology leaders in managing large-scale digital transformations.

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