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Reengineering Evolution, Devolution & Revolution Nat Pryce @natpryce | natpryce.com | nat@natpryce.com

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Quoting

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Grand vision APAC EMEA US

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Original architecture

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Attempted optimisation

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Parallelise calculations for APAC APAC EMEA

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Start refactoring, but don't finish APAC EMEA

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A new feature for EMEA APAC EMEA

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Reports for APAC APAC EMEA

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Diagnosing problems

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The system was modelled on a manual, paper-based process

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Idealised architecture

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Separate the projects

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"Cuckoo's Egg" application behind gateway

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HTTP data service "simplicators"

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"Pregression" tests

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Fake simplicators in system tests

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Introduce an acceptance test driven process

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Replace the GUI with a web application

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Continual indicative quoting is just a client

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Caching proxies for performance and scaling

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Lines of Code Over Time