Java

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A developer friendly GraphQL client

With a growing microservice landscape, the importance of aggregation layers is also increasing. For some of these aggregation services we are trying Facebook’s GraphQL, with two of them now running on our production environment. We've found that one of the drawbacks in using GraphQL is maintenance on both domain models and GraphQL queries.

A developer friendly GraphQL client

Using Elasticsearch as the Primary Data Store

The biggest e-commerce company in the Netherlands and Belgium, bol. com, set out on a 4 year journey to rethink and rebuild their entire ETL (Extract, Transform, Load) pipeline, that has been cooking up the data used by its search...

Using Elasticsearch as the Primary Data Store

Making sense of the user agent string

Ever since I’ve started working for a WebAnalytics company in 2005 I’ve been working on problems related to making sense of web data. One of the most difficult elements in this type of analysis is making sense of the user...

Making sense of the user agent string

My baby was leaky and now it’s not

When you build a service at bol. com your responsibility doesn’t end once the build is green. You’re actually supposed to run it (and keep it running) in production, too.

My baby was leaky and now it’s not