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Moving fast shouldn’t mean breaking things, but Facebook’s old mantra often reflects the realities of a rapidly evolving codebase and infrastructure. The Guardian’s development culture is designed to allow us to move quickly, deploy a dozen times a day and get statistically-significant A/B test results within hours.

Sometimes, though, that leads to the odd slip up.

Join Gareth for this talk as he lays bare just a few of the mistakes they made and more importantly, the lessons learned and remediation they took to avoid the problems in the future.

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