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December 10, 2025
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AI-Driven Legacy Decomposition
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December 10, 2025
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Transcript
@duffleit David Leitner AI-DRIVEN LEGACY DECOMPOSITION
@duffleit DAVID LEITNER Principal Engineer 👋
[email protected]
🌎 @duffleit
Software Transformation Best-in-Class Support in O U R S E
R V I C E S Products & Data ! ? ? ? ? Cloud & Platform Engineering Architecture & Agility
Software Transformation
Connecting Ideas. Delivering Impact. just put AI on it
@duffleit Modern System ✨ Legacy System 🧟
@duffleit 60% of Applications are Legacy* 92% of Cost go
into Maintenance if you trust Gartner
@duffleit
@duffleit Legacy System Modern System ✨ 🧟
@duffleit Modern System ✨ Legacy System 🧟 Take the existing
COBOL system and modernize it. Autonomous AI & also here Assistive AI Help me with this task
@duffleit why depends whom you ask Take the existing COBOL
system and modernize it.
@duffleit Save Costs Time To Market Rehost Replatform Rearchitect Replace
Retire Revisit Reduce Risk Motivators Strategies ⬆ ⏺ ⏺ Execution
@duffleit Forward Engineering Reverse Engineering Rehost Replatform Rearchitect Replace Retire
Revisit Execution Analyze Document Extract Specify Build Integrate Decompose Plan Test Cut Over
@duffleit Rehost Replatform Rearchitect Replace Retire Revisit Execution Analyze Document
Extract Specify Build Integrate Decompose Plan Test Cut Over Reverse Engineering Forward Engineering Value Driven Modernization
@duffleit Legacy System 🧟
@duffleit Legacy System 🧟 Trading
@duffleit Legacy System 🧟 Trading ✨
@duffleit Legacy System 🧟 Trading ✨ Reverse Proxy Analyze Decompose
& Integrate Refactor Build Tests
@duffleit Analyze Decompose & Integrate Refactor Build Tests
@duffleit Rag Analyze Decompose & Integrate Refactor Build Tests Spec
MCP https://martinfowler.com/articles/exploring-gen-ai/sdd-3-tools.html
@duffleit Rag Analyze Decompose & Integrate Refactor Build Tests MCP
Spec
@duffleit Analyze Decompose & Integrate Refactor Build Tests AI Dependency
Analysis
@duffleit This whole AI Slop can become suddenly useful Analyze
Decompose & Integrate Refactor Build Tests Specify Clarify Plan Task Analyze Implement
@duffleit Analyze Decompose & Integrate Refactor Build Tests Legacy System
🧟 Trading ✨ Reverse Proxy Testcases
@duffleit Legacy System 🧟 ✨ Reverse Proxy Blueprint Strangle Fig
Migration Legacy System 🧟 Blueprint Bulkhead Stability Load Balancer 🧟 Façade ✨ Blueprint Replace Façade Third Party Modernization Blueprints Task Analyze BluePrints
@duffleit orchestrating agents Modernization Blueprints Task Analyze BluePrints /slash-commands
@duffleit orchestrating agents /slash-commands ModernAIzer Legacy System 🧟 ModernAIzer
@duffleit Demo
@duffleit Autonomous AI Modern System ✨ Legacy System 🧟 Assistive
AI Probably (still) over-hyped Process-step Accelerators
@duffleit If you digitize a shitty process, then you’ll end
up with a shitty digital process Thorsten Dirks
@duffleit If you put AI on a shitty digitized process,
then you’ll end up with a shitty digital process with AI.
@duffleit Legacy Modernization AI 🧰 Automation
@duffleit Legacy Modernization Automation AI 🧰
@duffleit Legacy Modernization AI Automation 🧰
@duffleit AI
@duffleit
@duffleit DAVID LEITNER Principal Engineer 👋
[email protected]
🌎 @duffleit Slides