eventual consistency ftw david craelius, cto Klarna in short - - - PowerPoint PPT Presentation

eventual consistency ftw

david craelius, cto

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• Independent, founders still majority owners
• Delivering online payments not built on top of

the traditional VISA/MC stack

• Aim to double each year
• >€100M turnover 2012 & we’ve always been

profitable

• 800 FTEs (and counting)
• Investors such as Sequoia Capital, DST,

General Atlantic and Atomico.

• Functional programming

junkies

Klarna in short

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zero friction for consumers

Klarna vision

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….but taking 100% of

• ur merchants check-out requires a close

to 100% availability of our service. fuck.

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my view on true UX:

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availability is no longer optional

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K2

• our migration strategy
• ut of the “dark pit of hell”*.

*our technical debt a.k.a. the monolith

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K2 target: 99.99% availability 24/7 utilizing a lean, “no master” pattern.

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K2 routing

@cannedprimates @uwe_ @massemanet

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K2:FRED architecture

@cannedprimates @uwe_ @massemanet

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K2:FRED infrastructure

@cannedprimates @uwe_ @massemanet

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A service: Klarna Payment GW

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no master (eventual consistency) && realtime credit scoring && credit card processing = wtf? you dumb?

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We expect things to fail

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K2:FRED Graceful degradation of services

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Q?