JJ's World

Creating a dashboard with MEAN.JS

Sun 16 April 2017

I will make a dashboard to give an overview of the refills for the car using MEAN.JS and D3.js.

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MongoDB Express.js Angular 2 Node MEAN dashboard D3.js

Using R and Python together in a notebook

Fri 07 April 2017

A simple description how to use R and Python to interact in a Jupyter notebook.

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notebook R Python Jupyter

MongoDB - First try

Wed 05 April 2017

My first experience with MongoDB. I will install MongoDB and Pymongo, insert some data and query it. Next step will be to tryout monary, but for this notebook it is out of scope.

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notebook mongoDB pymongo Python Jupyter database

First experiments with NLTK

Wed 29 March 2017

My first experiment using the NLTK library of Python

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notebook nltk Python Jupyter machinelearning

Basic search with Elasticsearch

Tue 14 March 2017

Inspired by this tutorial I tried to continue investigating Elasticsearch since I would like to use a fast indexing tool for the data I am gathering and the applications I am developing.

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notebook elasticsearch Python Jupyter

Color recognition of images using OpenCV

Tue 31 January 2017

As a training for myself to get more familiar with image classification and OpenCV I followed the tutorial on http://www.pyimagesearch.com/2014/08/04/opencv-python-color-detection/. I modified it slightly to fit my environment.

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notebook Python Jupyter opencv imagedetection

Mocking in unittests in Python

Mon 30 January 2017

In my previous post on testing in Python I explained how to test in a Jupyter Notebook. Now a few weeks later I need to get familiar with mocking in Python. Since this is a new concept for me I made a small notebook testing different functionalities of the mocking library.

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notebook unittest Python Jupyter mock

Unittesting in a Jupyter notebook

Tue 17 January 2017

Unittesting in a Jupyter notebook

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notebook unittest Python Jupyter

Add CSS to Splunk dashboard

Sat 17 December 2016

To add some custom style to your dashboard, you can create a cascade stylesheet in your app folder and overrule the standard dashboard lay-out.

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Splunk tutorial dashboard CSS

Create a Splunk app to monitor Nginx

Mon 12 December 2016

In this short tutorial I will create a Splunk app to monitor the webserver. We will create the bare-bone app and we add a few panels to the dashboard.

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Splunk tutorial dashboard Nginx
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I'm Jitse-Jan, a data lead based in London working across data platforms, orchestration, and analytics engineering: dbt, Dagster, Snowflake, dlt, and DuckDB, with Python underneath most of it.

Lately that also means working AI-assisted day to day, using Claude alongside a structured note-taking setup to keep multiple projects straight.

This blog goes back to 2016. There's a real gap in the middle, a long stretch of heads-down client work rather than writing, but the interest never stopped, and the more recent posts pick up where the site left off.

I use this page as a portfolio, cheatsheet, and historical record. Expect shell commands, working examples, and write-ups of things I built, mostly so I don't have to reinvent the wheel next time.


  • S3
  • javascript
  • Ethereum
  • blockchain
  • MongoDB
  • data engineer
  • shell
  • PySpark
  • Pandas
  • dataframe
  • Docker
  • DevOps
  • Spark
  • AWS
  • Ubuntu
  • notebook
  • Jupyter
  • Python

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