Modernizing through evolution not revolution

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MODERNIZING THROUGH EVOLUTION NOT REVOLUTION GUUST NIEUWENHUIS

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ABOUT ME Guust Nieuwenhuis Managing Partner @ We Are North Full Stack Web Wizard Masa CMS Born in The Netherlands Living in Belgium Soccer coach Mountainbiker

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MODERNIZING THROUGH EVOLUTION NOT REVOLUTION GUUST NIEUWENHUIS

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10 YEARS Average software lifetime

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Spaghetti code Outdated framework Unsupported libraries Deprecated integrations No tests Not documented Difficult to develop Hard to maintain

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What’s next?

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Flights booking engine Performance issues Decided to rewrite from the ground up Kept adding new functionality to the “old” engine Development of the “new” engine trying to catch up Financial disaster

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REWRITE CODE FROM SCRATCH IS THE SINGLE WORST STRATEGIC MISTAKE THAT ANY SOFTWARE COMPANY CAN MAKE Joel Spolsky   Co-founder Trello and Stack Over fl ow

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A feeling isn’t sufficient Rewrite delays the release of the project More bugs and less functionality Expensive No guaranteed success

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So, what’s next?

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12+ years old web application New separate API for mobile app New report builder module Integrated new module in old application Sharing the database Feature flags

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12+ years old web application New separate API for mobile app New report builder module Integrated new module in old application Sharing the database Feature flags

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12+ years old web application New separate API for mobile app New report builder module Integrated new module in old application Sharing the database Feature flags

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25+ years old client-server app Need to move to “The Cloud” New module developed Domain Driven Design Microservices architecture Events between “old” and “new”

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25+ years old client-server app Need to move to “The Cloud” New module developed Domain Driven Design Microservices architecture Events between “old” and “new”

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How?

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1. Case

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1. Case 2. Boundary

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1. Case 2. Boundary 3. Strategy

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1. Case 2. Boundary 3. Strategy Bubble Context

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1. Case 2. Boundary 3. Strategy Bubble Context

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1. Case 2. Boundary 3. Strategy Bubble Context Anticorruption layer (ACL)

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1. Case 2. Boundary 3. Strategy Bubble Context ACL Synchronisation

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1. Case 2. Boundary 3. Strategy Event queue

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SAME HABITS, SAME MISTAKES!

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WANT TO READ MORE? Domain Driven Design Bounded Context Strangler Fig Pattern Anti Corruption Layer Eric Evans Martin Fowler Anti Patterns Event Driven Architecture Microservices Feature Flags

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ONE MORE THING Steve Jobs Co-founder of Apple, Next and Pixar

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3 applications Overlapping functionality Consolidate applications Minimum viable product (MVP) Won’t copy all functionality Business case drives rewrite!

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3 applicaties Overlapping functionality Consolidate applications Minimum viable product (MVP) Won’t copy all functionality Business case drives rewrite!

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MODERNIZING THROUGH EVOLUTION NOT REVOLUTION [email protected] https://www.linkedin.com/in/guustnieuwenhuis

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