If I ever write a book ...
Programming like a Spaniard Read more...
RocksDB range queries in KafkaStream: dealing with big results
An example of when to use the RocksDB range query in KafkaStreams. Read more...
REPL driven development: immediate feedback for you backend code
Video, transcript and slides from the GeeCon 2018 talk Read more...
How to do a Java/JVM heap dump in Kubernetes
A simple task that is a little bit of a headache on Kubernetes Read more...
How to convince your company to use Clojure
The definitive video that will convert anybody to Clojure Read more...
In KafkaStreams, when to choose between a KTable or a KStream?
An example of how to choose between a KafkaStreams' KTable or KStream when doing stateful streaming transformations Read more...
Kubernetes explained in pictures: StatefulSets, Persistent Volumes and Headless Services
Explaining Kubernetes StatefulSets, Persistent Volume and Headless Services using KubePark's cloakroom service. Read more...
Kubernetes explained: the theme park analogy: auto scaling, taints and affinities
More on explaining Kubernetes and theme parks: scaling, taints and affinities. Read more...
Kubernetes explained in pictures: the theme park analogy
This is an attempt to explain Kubernetes core concepts (pods, nodes, services, resources, ...) with an theme park analogy. Read more...
Habits of efficient developers - WeAreDevelopers 2018
Video from my presentation on WeAreDevelopers 2018 on habits of efficient developers Read more...
A more efficient developer: Go and have a rest
Coffee is good. Sleeping is great. Read more...
Per user rate limiting with OpenID connect and Istio in Kubernetes
How to do rate limiting with Istio on Kubernetes a per user basis, using OpenID Connect to identify it. Read more...
Image attribution:
Photo of The Queues by Mark Walley.
Habits of efficient developers - slides
Slides for the "Habits of efficient developers" talk at WeAreDevelopers 2018 Read more...
Did you read my email?
Is it urgent? Read more...
Kafka, GDPR and Event Sourcing
Proof of concept for compliance with GDPR on an Event Sourcing architecture built with Apache Kafka. Read more...
Image attribution:
Modified from "He Wasn't This Angry" by Allison Mickel is licensed under CC BY-NC-SA
Kafka, GDPR and Event Sourcing - Implementation details
Implementation details for a proof of concept for compliance with GDPR on an Event Sourcing architecture built with Apache Kafka. Read more...
Kafka, distributed coordination and the actor model
On how to design KafkaStream applications in terms of the actor model. Read more...
Production data never lies
Using production data to automatically generate Avro schemas, using Spec-Provider. Read more...
Image attribution:
Photo of Pinocchio from Pexels.
Easing open source contributions with Docker
Software installation instructions sometimes look like IKEA assembly instructions and are as difficult to follow as those. Read more...
Image attribution:
Akvo’s open source badge, designed by Thomas Bjelkeman-Petterson and Anke van Lenteren
How to Docker Compose a developer environment: an open source example
An efficient team needs to have an easy way of setting up a development environment. This is a detailed example of how to do it. Read more...
Swagger Search: Finding an endpoint in your microservice primordial soup
An open source tools to find endpoints in a microservice architecture. Read more...
Why to Docker Compose a calm environment
Setting up or upgrading a developer environment should be an easy and repeatable process. Docker Compose is the tool to achieve it. Read more...
Applying stability patterns: a case study - Devoxx PL 2017
Video from my presentation on Devoxx PL 2017 on stability patterns Read more...
A more efficient developer: write programs for yourself
The shoemaker's son always go barefoot. Read more...
Image attribution:
English proverbs center
A more efficient developer: master your IDE
A professional developer should look professional while using his main tool. Read more...
Image attribution:
Wax on, wax off - Master Miyagi, The Karate Kid
A more efficient developer: disable notifications
How to become X times more efficient in one simple step. Read more...
Error budget: Google's solution for innovating at a sustainable pace
New features always trump technical work. Can we objectively measure and decide when they should not? Read more...
Image attribution:
http://www.wallpapervortex.com/
Atoms, delays and side effects: a resource management idiom for Clojure
Concurrency in Clojure is easy peasy, unless you have to deal with side effects. But atoms and delays can still help us. Let's look at an idiom for resource management. Read more...
Image attribution:
http://www.renegadejuggling.com
Delay: Clojure's forgotten concurrency primitive
When talking about Clojure's concurrency primitives, we often forget "delay". Let's see how it can help us. Read more...
Image attribution:
Scott Wolfe Jr
Testing or Monitoring? MTBF or MTTR? Make your choice!
What is more important testing or monitoring? Should you optimize for mean time between failures (MTBF) or mean time to repair (MTTR)? Read more...
Image attribution:
Baby, You Knock Me Out, Family Guy
Clojure's most important lesson
Clojure has a lot of important and unique lessons to teach, but which one is the most important? Read more...
Image attribution:
Consultant shows Clojure code sample to VBA team via @progpaintings
Automating resilience testing with Docker and Property Based Testing - Devoxx UK 2017
Video from my presentation on Devoxx UK 2017 on Docker, resilience and property based testing Read more...
Joins on stateful stream processing using Kafka Streams' KTables and GlobalKTables
Exploring different options in Kafka Streams to join KTables, both with and without shared keys. Read more...
Documenting your architecture: Wireshark, PlantUML and a REPL to glue them all.
Instead of drawing UML diagrams, why not generate them from a network traffic capture of the running system? Read more...
Kerberos explained in pictures
Kerberos is a single sign on authentication protocol, we will try to explain how it works with some hopefully simple diagrams. Read more...
Proof of concept using KafkaStreams and KTables - implementation notes, gotchas and Docker Compose example
Implementation details from a proof of concept using Kafka Streams and KTables using Clojure and Docker Read more...
Proof of concept using KafkaStreams and KTables
Exploring how to use KafkaStreams and KTables for building a stateful stream processing application Read more...
Why Java? Why Clojure?
The reasons to use Java and Clojure are the same Read more...
Automating resilience testing with Clojure and Docker - EuroClojure 2016 video
Video from my presentation on EuroClojure 2016 Read more...
The boy who cried wolf, an IT tale
How can we apply the fable "The boy who cried wolf" to our development? Read more...
Image attribution:
Kidztory
Automating resilience testing with Clojure and Docker - EuroClojure 2016 slides
Slides from my presentation on EuroClojure 2016 Read more...
Good tests, Bad tests
Unit testing is just another practice, and as such it has its benefits and its costs. How do you know that your test suite is paying off? Read more...
REPL Driven Development - Voxxed Days Belgrade 2016 video
Video from my presentation on Voxxed Days Belgrade 2016 on why and how to do REPL Driven Development Read more...
The broken promise of static typing
The more advanced the type system, the less bugs that we should have. Read more...
The tragedy of 100% code coverage
TDD and BDD are very good practices, but what are the costs enforcing them? Read more...
Logging levels: the wrong abstraction.
No more DEBUG/INFO/WARN/ERROR log level. Read more...
Lines of code actually matters.
For a long time I thought lines of code was a bogus metric, but after working in both Java and Clojure, I have changed my mind. Read more...