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Automating Legacy System Understanding with AI to Accelerate Modernization Readiness

At a glance

  • Client
Global Product Company
  • Industry
Software & HiTech
  • Solution Provided
Legacy System Modernization, AI-Generated System Intelligence
  • Technologies Used
Construct™: Chronicle, GPT-4o, Claude, DocuWriter.ai, n8n, Flowise
The Challenge

The client relied on a business-critical legacy system written in RPG, but faced mounting challenges that impeded modernization:

  • Core business logic was deeply embedded in outdated RPG code with no centralized documentation or clear functional ownership
  • Engineering velocity was constrained by limited system visibility, making it difficult to onboard new developers or plan transformation efforts
  • Fragmented, undocumented architecture increased delivery risk and made feature planning a guessing game
  • Without structured system knowledge, modernization initiatives stalled under the weight of uncertainty
The Solution

To accelerate transformation, Gorilla Logic deployed Construct™: Chronicle—an AI-powered workflow that converts legacy source code into actionable system intelligence.

 

Key components included:
  • Code Understanding at Scale: using GPT-4o and Claude, Construct™: Chronicle ingested raw RPG source code and extracted logic summaries, dependency mapping, and technical narration
  • LLM-Readable Context Generation: integrated DocuWriter.ai to translate RPG syntax into structured input that large language models could interpret effectively
  • Workflow Orchestration: automated prompt routing, model sequencing, and content refinement using n8n and Flowise, enabling generation of multiple documentation types
  • Multi-Format Outputs: delivered clean, consumable outputs including program summaries, visual system diagrams, and a modernization-aligned feature backlog

The Result

  • Faster Ramp-Up: significantly reduced onboarding time for engineers by replacing tribal knowledge with structured, AI-generated documentation
  • Improved Knowledge Transfer: eliminated reliance on hard-to-reach SMEs by making hidden logic visible and understandable
  • Modernization-Ready Backlog: delivered LLM-generated Jira epics and feature stories aligned with modernization goals—ready for engineering execution

The Takeaway

Gorilla Logic Construct™ is how we deliver faster—with less engineering lift and greater confidence.

It’s not a product. It’s our portfolio of delivery-tested workflows, powered by modular AI agents. Every workflow is proven in delivery, reusable by design, and capable of cutting engineering work by 30-80%.

Construct™: Chronicle is our system documentation accelerator—built to extract undocumented logic to reduce SME reliance and guide modernization.

Gorilla Logic Construct™ is how we deliver faster—with less engineering lift and greater confidence.

It’s not a product. It’s our portfolio of delivery-tested workflows, powered by modular AI agents. Every workflow is proven in delivery, reusable by design, and capable of cutting engineering work by 30-80%.

Construct™: Chronicle is our system documentation accelerator—built to extract undocumented logic to reduce SME reliance and guide modernization.