Articles

Learn from our experience developing the Deliveroo product.

How to Experiment Rapidly Without Losing Rigour

As data scientists at Deliveroo we evaluate our work via robust experimentation, and we take a frequentist hypothesis testing approach. The standard method places a lot of importance on deciding upfront how large an impact we believe any experiment might have. If the estimated impact is very different to the actual impact, we might waste a lot of time running an experiment where we could have obtained a result sooner. This means that we can’t iterate and innovate as quickly as we would like. Our preferred solution to this problem is sequential experiment designs.

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Testing with Third Party Services in Go

Taking advantage of Golang’s duck typed interfaces and net/http/httptest to test third party dependencies in web applications.

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Building a Payments Lambda with Terraform

While integrating with a new payment provider, we needed to sync merchant ids via SFTP. We built an AWS Lambda function with Terraform to do this. I’ll walk through our Terraform configuration and the hurdles we overcame around accessing the S3 bucket and retrieving sensitive credentials.

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