I’m Eric Tummers, Software Architect at Statistics Netherlands, and this is how I work

My jobs description says Software Architect. I’m guiding my team through the technical hurdles and do some programming/testing/analysing myself. We follow the scrum guide and are working towards continuous integration and deployment. We do this in small steps. Every sprint we complete means the retrospective is done in the pub.

I expect the best and I give the best. Here’s the beer. Here’s the entertainment. Now have fun. That’s an order!
RasczakLocation: Sittard, NL
Current Gig: Devops Teamlead, CBS
Word that best describes how you work: Teamwork
Current mobile device: iPhone se
Current computer: MacBook 15 inch

What apps/software/tools can’t you live without? Why?

Wunderlist: work tasks, chores, groceries, planning, every task is there. I’m aware of the acquisition by Microsoft and the planned end-of-life.
Evernote: I’m a fan for years now.
Parallels 11: Running Windows on my MacBook is a must. And of course visual studio, team foundation server, build, release manager, sql server management studio, remote desktop, powershell, and some other tools I need for work.
Alfred: keyboard shortcuts for everything. I bought the powerpack and advise you to do the same. Still on v2 though.

What’s your workspace setup like?

Work at the office is on a thin client with 24 inch screen and (wired) mouse and keyboard. The desk and chair comply with all regulations. We have a great coffee machine.


My home workspace is still my Macbook 15 inch. I’ve a new setup with logitech keyboard and mouse (MX800) and Benq 24 inch monitor (BL2420PT). Nothing fancy but the extra screen space is very welcome.

What’s your best time-saving shortcut/life hack?

Timebox. Start on a task and spent the time you’ve got to get the best result. Get someone to look at it, get feedback. Then decide if the result is final or to spent some more time.

Besides your phone and computer, what gadget can’t you live without and why?

I replaced my Magellan Echo with the Garmin FR235. It has smart watch features and a optical heart rate monitor. My phone is on mute since the Garmin notifies me of everything.
My Apple Airpods. Easy to use, small and good sound. Never leave the house without them.

What everyday thing are you better at than everyone else? What’s your secret?

Learning new things. My current project lets me implement new things (joy) Also I try to learn the things I know to my team or anyone who listens.
I have a basic understanding of how things work and try to map new things on there. For the details I have a Pluralsight subscription and black belt google skills.

What do you listen to while you work?

My alarm clock plays classical music to wake me up in the morning. The car stereo plays about everything (grunge, rock, kids stories) driving to work. When I need some focus I play drum and bass on my headphones. My ringtone is still Run riot by Camo & Krooked, although it is muted since I got the Garmin.

What are you currently reading?

The Hard Thing About Hard Things. It gives an insight into the problems a CEO has and how to overcome these. I enjoyed reading it on my last vacation and plan to read it again after I finish it.

How do you recharge? What do you do when you want to forget about work?

Spending quality time with my wife and daughters. Phone on silent, no screens, no work. Mostly piggyback riding and tea parties
Also sports like running, fitness, climbing and snowboarding to keep me fit and healthy.

Fill in the blank: I’d love to see _________ answer these same questions.

DC Rainmaker (Ray) has been on my reading list for years. His reviews about sport gadgets is amazing. If you don’t know who this is I urge you to click the link. For the rest; you know why.

What’s the best advice you’ve ever received?

someecards.com - Make a shit first draft you cannot edit a blank page
I believe this is a variant on a Hemingway quote.

Is there anything else you’d like to add that might be interesting to readers?

Learn Powershell. There is so much possible with Powershell. If you can learn one thing this year pick Powershell.

Original idea from Lifehacker.com.

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R Shiny dashboard inspection with profvis

We’re building a R Shiny dashboard to display big datasets. In our production environment we sometimes experience slow performance. Profiling with the profvis package is our plan to fix this.

The profvis package needs to be installed. Then it can be used by encapsulating the startcode in a profvis call.

# only once

# in your startcode

After the R Shiny dashboard starts we followed a test scenario and stopped the app. Then R Studio showed us the profile data in two tabs (images below). One tab with a flame graph so you can see the spikes in (wait) time / memory during the test scenario. The other tab shows the same data in a table per file / function.

Flame Graph tab with memory and time per code line
Data tab with memory and time per file/function

We now have a better understanding where our dashboard is performing less optimal. After changing the code we can start another profvis session to see if the changes fix or add to the problem.


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Developing inside a Container

I’m contributing to Sonarqube-Sql-Plugin (https://github.com/erictummers/sonar-sql-plugin) and creating pull requests to merge back my changes. Getting my environment setup was easy using homebrew (https://brew.sh) but still required some work. Here is how VSCode makes this much easier with developing inside a container.


With docker you can start an isolated environment that is created to do one thing – host the software. The container is setup with all the dependencies and settings needed during the initial build, so we can just use them. Installation is easy with docker desktop (https://www.docker.com/products/docker-desktop)

VSCode now has an extension that you can use to run the development environment inside a container. I installed the remote containers extension (https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers) and added the .devcontainer folder. The dockerfile contents I copied from Microsoft’s sample container for java (https://github.com/microsoft/vscode-dev-containers/tree/main/containers/java/.devcontainer) Now I can dev – build – repeat in a container.

VSCode project

After reopening the project in the container (F1 > Remote-Containers: Rebuild and Reopen in Container) VSCode started loading everything I needed to develop. Me being a Microsoft developer, I didn’t know the pom.xml contained the build target information. The maven build targets are offered with a run button next to them for easy use. I was able to build the jar file and test it within minutes.

The .devcontainer folder can be added to Github so everyone can use it. No more “works on my machine” 😉


developing inside a container – vscode (https://code.visualstudio.com/docs/remote/containers)

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Code Notes snippet manager

Like many developers I have some snippets with code. These snippets are dear to me and I use them all the time. Without a real place to store them I would be lost. This is where Code Notes comes in.

image from https://lauthieb.github.io/code-notes/

Code Notes (https://lauthieb.github.io/code-notes/) is a standalone application that stores my snippets. It is simple and intuitive to use and deploy – just put the files in your My Documents and use it from there. There is the option of connecting to github for their gist feature – but I have no internet connection from work :(. Maybe someday …

You never miss this tool until you’ve used it. Now I can’t work without it. Go download it, use it and contribute to it (https://github.com/lauthieb/code-notes).

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macOS Big Sur update without issues

My macbook became my work-from-home device and I was hesitant to update to Big Sur. The question today is “when to update, not if”. So I made a backup, had my trusty macbook 2009 ready for emergencies and started the installer.

TLDR: no issues on my MacBook Pro (Retina, 15-inch, Mid 2015) except for Little Snitch 4 which is incompatible and I had to upgrade to version 5 for €25


MacBook Pro (Retina, 15-inch, Mid 2015)
Processor 2,2 GHz Intel Core i7
Memory 16 GB 1600 MHz DDR3
SSD 256 Gb
Graphics Intel Iris Pro 1536 MB

I’ve written about my update to 10.14 (Mojave update without issues) and updated to 10.15 sometime ago without any issues.


After the download of 10+ Gb the installation completed in about an hour. I left the scene and don’t have an exact number. It was ready when I returned.


After the first login I was presented with some privacy pop-ups and some blocked extensions. Again I had to upgrade little snitch just like with Mojave. I allow the app store to just update everything when available (like on iOS) and all other apps were up-to-date.

All other apps just worked. I was most happy about Camtasia 2 and Alfred 3 still working. Check https://roaringapps.com for compatibility of your favourite apps. But keep an eye on the versions – since Little Snitch is supported on Big Sur but not version 4.


Unfortunately Parallels Desktop 11 had stopped working. Never really used it, so I won’t be buying the upgrade.

Work around

Logitech Control Center was a disappointment. I only needed my Logitech Performance MX mouse extra button(s) configured to trigger Mission Control and that was not possible (for me). Turns out that is part of macOS settings > Mission Control > Mouse Button xxx.

On Monday I can work-from-home with an updated macbook. Everything just works.

Why upgrade?

1. I want to have my macbook running the latest and greatest macOS (patches)
2.New control centre and other improvements – https://www.apple.com//macos/big-sur/

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DataGrip TFS plugin setup

We use DataGrip for developing postgres on Greenplum. To get our sources into TFS we’re using the Azure DevOps plugin (https://plugins.jetbrains.com/plugin/7981-azure-devops). Since the documentation is very little and the requests for help are many, we share our setup.

We assume you’ve already got DataGrip installed. In the commands we use the following:

tfs projectdashboard
tfs server urlhttps://localtfs/tfs/defaultcollection
parameter values for commands

Team Explorer Everywhere

The plugin relies on the team explorer everywhere software from https://github.com/Microsoft/team-explorer-everywhere/releases. This requires a java runtime to be installed. That is already installed with DataGrip (so first install that)

We edited the tf.cmd file to use less memory for java. Maybe you’ll need to do the same. Details on github: https://github.com/microsoft/azure-devops-intellij/issues/45#issuecomment-268790878

  1. Unzip the latest release of team explorer everywhere in your C:\Users\[USER]\Documents folder
  2. Start a command prompt with administrative rights (run as Administrator)
  3. Go to the folder of step 1
  4. Create a new workspace
    tf -login:john,secret -server:https://localtfs/tfs/defaultcollection workspace -new greenplum
  5. Map a local folder with a tfs project in the workspace (make sure to create the local folder)
    tf workfold -map -workspace:greenplum $/dashboard c:\dashboard
  6. Get the sources
    tf get -recursive c:\dashboard

DataGrip project

Now comes the “hacking” of a DataGrip project so it can use the TFS plugin.

  1. In DataGrip open menu File > New > Project – supply the name dashboard
  2. File > Close Project
  3. Close DataGrip
  4. Go to C:\Users\[USER]\AppData\Roaming\JetBrains\DataGrip2020.3\projects\dashboard with the Windows Explorer
  5. Move the .idea folder to C:\dashboard
  6. Open DataGrip
  7. File > Open Project
  8. In the Open dialog remove the “old” dashboard project as it points to the old location
  9. Browse to the C:\dashboard and open it as a project

TFVC plugin

Finally the installation of the plugin.

  1. In DataGrip open File > Settings
  2. Click the Plugins section, click the wheel > Install plugin from disk and supply the path to the zip file downloaded from https://plugins.jetbrains.com/plugin/7981-azure-devops
datagrip settings to install plugin
  1. Restart DataGrip
  2. File > Settings
  3. Open the Version Control section and click TFVC > supply the location of tf.cmd in your C:\Users\[USER]\Documents\TEE-CLC-14.135.0 folder
  4. Uncheck the Use built-in reactive client if possible
  5. Visual Studio TF client was already found since we have VS2019 installed
  6. Click OK
  7. File > Attach Directory to Project – supply c:\dashboard
  8. Git > Enable Version Control Integration – choose TFVC
  9. Click OK
  10. A dialog prompts for the password to connect to TFS – supply secret
  11. Click OK
  12. Now DataGrip shows the folder structure on the right and options to use TFVC like Checkout and Update (= get latest).

These are the steps we used to get it working. Hope you’re able to achieve great things with this knowledge.

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