Michael Koper
@michaelkoper.com
Dad of two - Founder of https://nusii.com - Bootstrapper - Ruby on Rails
Pinned
Michael Koper
@michaelkoper.com
· Oct 22
Hello again!
We are doing introductions?
I'm Dutch living in Madrid, Spain. I have been working on my own startup Nusii (online proposal software) for 10 the last 10 years.
I recently started to do some temporary freelancing on the side just for fun.
I like playing the drums 🥁
We are doing introductions?
I'm Dutch living in Madrid, Spain. I have been working on my own startup Nusii (online proposal software) for 10 the last 10 years.
I recently started to do some temporary freelancing on the side just for fun.
I like playing the drums 🥁
you can just bring your kids when you do things. No screens needed!
December 13, 2025 at 12:30 PM
you can just bring your kids when you do things. No screens needed!
Loving the new Rails 8 local CI dsl!
gh signoff is the way
gh signoff is the way
December 12, 2025 at 11:48 AM
Loving the new Rails 8 local CI dsl!
gh signoff is the way
gh signoff is the way
Never let a nerd doing customer support
December 12, 2025 at 9:29 AM
Never let a nerd doing customer support
It works, starting the process with the Claude slash command /transcribe and it will ask me a couple of questions, then does some little research to get as much info as they can about the company and the people and put that inside a markdown file. Then it transcribes the interview.
December 10, 2025 at 11:44 AM
It works, starting the process with the Claude slash command /transcribe and it will ask me a couple of questions, then does some little research to get as much info as they can about the company and the people and put that inside a markdown file. Then it transcribes the interview.
Trying to create a new employee that transcribes my customer interviews in plain text.
Can also just pay for a service, but... that is no fun :P
Can also just pay for a service, but... that is no fun :P
December 10, 2025 at 10:50 AM
Trying to create a new employee that transcribes my customer interviews in plain text.
Can also just pay for a service, but... that is no fun :P
Can also just pay for a service, but... that is no fun :P
This month I did 4 customer interviews. And that is with a 10 year old SaaS product. It is still the most valuable thing I can do. It is crazy to see that most founders that are starting out, don't do this at all.
December 10, 2025 at 10:28 AM
This month I did 4 customer interviews. And that is with a 10 year old SaaS product. It is still the most valuable thing I can do. It is crazy to see that most founders that are starting out, don't do this at all.
It is that time of the year again!
December 7, 2025 at 1:58 PM
It is that time of the year again!
Reposted by Michael Koper
Design OS now has a page + email signup. If this looks interesting, I'd love to hear your feedback!
buildermethods.com/design-os
buildermethods.com/design-os
December 6, 2025 at 3:56 PM
Design OS now has a page + email signup. If this looks interesting, I'd love to hear your feedback!
buildermethods.com/design-os
buildermethods.com/design-os
I'm negotiating a custom plan for a new Nusii customer, by far the biggest we have at the moment. He just sent a LinkedIn connection...
Fuck!
Fuck!
December 2, 2025 at 3:59 PM
I'm negotiating a custom plan for a new Nusii customer, by far the biggest we have at the moment. He just sent a LinkedIn connection...
Fuck!
Fuck!
Today we were eating at a Mexican restaurant and the waitress showed us this framed note. It is what my kid left on the table when we left ~3 months ago 😍
(translation: The best restaurant of the world!)
(translation: The best restaurant of the world!)
November 30, 2025 at 5:51 PM
Today we were eating at a Mexican restaurant and the waitress showed us this framed note. It is what my kid left on the table when we left ~3 months ago 😍
(translation: The best restaurant of the world!)
(translation: The best restaurant of the world!)
After a year of inactivity with my SaaS I’m slowly getting my product obsession back. And for me that fuels right back to marketing as well. To get excited so I can tell the world works better for me than the other way around.
November 30, 2025 at 10:46 AM
After a year of inactivity with my SaaS I’m slowly getting my product obsession back. And for me that fuels right back to marketing as well. To get excited so I can tell the world works better for me than the other way around.
Saw an awesome talk by @karreiro.bsky.social yesterday at Madrid.rb about creating Ruby gems with a native Rust extension.
He ported the Rust toml parser to Ruby in a couple of minutes and it was almost 3 times faster than the fastest Ruby toml parser.
Such a great talk!
He ported the Rust toml parser to Ruby in a couple of minutes and it was almost 3 times faster than the fastest Ruby toml parser.
Such a great talk!
November 28, 2025 at 12:41 PM
Saw an awesome talk by @karreiro.bsky.social yesterday at Madrid.rb about creating Ruby gems with a native Rust extension.
He ported the Rust toml parser to Ruby in a couple of minutes and it was almost 3 times faster than the fastest Ruby toml parser.
Such a great talk!
He ported the Rust toml parser to Ruby in a couple of minutes and it was almost 3 times faster than the fastest Ruby toml parser.
Such a great talk!
A little secret, I never had CI for Nusii and it has never been a problem.
I just always run my tests and rubocop before deploying ¯\_(ツ)_/¯
Only make things complex when they need to be complex!
I just always run my tests and rubocop before deploying ¯\_(ツ)_/¯
Only make things complex when they need to be complex!
November 28, 2025 at 12:24 PM
A little secret, I never had CI for Nusii and it has never been a problem.
I just always run my tests and rubocop before deploying ¯\_(ツ)_/¯
Only make things complex when they need to be complex!
I just always run my tests and rubocop before deploying ¯\_(ツ)_/¯
Only make things complex when they need to be complex!
FYI. I learnt this today the hard way. A decimal column converts into a BigDecimal and a jbuilder template converts those into strings, not numbers.
Not ideal when you build a Zapier integration and you have no clue why the responses don't match 😅
Not ideal when you build a Zapier integration and you have no clue why the responses don't match 😅
November 26, 2025 at 8:04 PM
FYI. I learnt this today the hard way. A decimal column converts into a BigDecimal and a jbuilder template converts those into strings, not numbers.
Not ideal when you build a Zapier integration and you have no clue why the responses don't match 😅
Not ideal when you build a Zapier integration and you have no clue why the responses don't match 😅
Reposted by Michael Koper
Hey friends! OG Kit is off 30% for Black Friday week 🎁
Check out the video below, tell a friend, or just go buy it really!
It's pretty cool, if you haven't seen it 😆
Check out the video below, tell a friend, or just go buy it really!
It's pretty cool, if you haven't seen it 😆
Okay, so I'm pretty sure I've found the best way in the world to create dynamic Open Graph images! And I've turned it into a little product that I'd love to show you 🤩
Check out this quick video tour of Ogkit.dev to see how it works 👇
www.youtube.com/watch?v=UoVr...
Check out this quick video tour of Ogkit.dev to see how it works 👇
www.youtube.com/watch?v=UoVr...
The best way in the world to add Open Graph images to your website
YouTube video by Peter Suhm
www.youtube.com
November 26, 2025 at 1:37 PM
Hey friends! OG Kit is off 30% for Black Friday week 🎁
Check out the video below, tell a friend, or just go buy it really!
It's pretty cool, if you haven't seen it 😆
Check out the video below, tell a friend, or just go buy it really!
It's pretty cool, if you haven't seen it 😆
I installed SuperWhisper and now I'm talking to the AI like a fucking weirdo.
November 26, 2025 at 12:57 PM
I installed SuperWhisper and now I'm talking to the AI like a fucking weirdo.
Started a new experiment. Lets see if Laravel people need Proposal Software 😊
November 19, 2025 at 12:10 PM
Started a new experiment. Lets see if Laravel people need Proposal Software 😊
I'm feeling like the small guy that keeps dodging all the punches from the big guys. Dodged the AWS and Cloudflare outages!
November 19, 2025 at 9:37 AM
I'm feeling like the small guy that keeps dodging all the punches from the big guys. Dodged the AWS and Cloudflare outages!
I'm starting to create many Claude Code commands recently. One of those things of, why didn't I do this before?
November 19, 2025 at 9:25 AM
I'm starting to create many Claude Code commands recently. One of those things of, why didn't I do this before?
I just sold my old monitor with @benediktdeicke.com 's UserList sticker on it.
"Sorry I forgot to take that sticker off"
"Don't worry, I like it"
😂
"Sorry I forgot to take that sticker off"
"Don't worry, I like it"
😂
November 18, 2025 at 9:32 AM
I just sold my old monitor with @benediktdeicke.com 's UserList sticker on it.
"Sorry I forgot to take that sticker off"
"Don't worry, I like it"
😂
"Sorry I forgot to take that sticker off"
"Don't worry, I like it"
😂
I had a small discussion a while ago where they said that unit tests should never hit the database.
I honestly don't know why it is such a big deal? It is so much easier to write. Unit tests are also the fastest test to run. 545 tests under a second ¯\_(ツ)_/¯
I honestly don't know why it is such a big deal? It is so much easier to write. Unit tests are also the fastest test to run. 545 tests under a second ¯\_(ツ)_/¯
November 17, 2025 at 10:43 AM
I had a small discussion a while ago where they said that unit tests should never hit the database.
I honestly don't know why it is such a big deal? It is so much easier to write. Unit tests are also the fastest test to run. 545 tests under a second ¯\_(ツ)_/¯
I honestly don't know why it is such a big deal? It is so much easier to write. Unit tests are also the fastest test to run. 545 tests under a second ¯\_(ツ)_/¯
Also for the Ruby people in Madrid. That mountain chain in the back is called La Pedriza and it is absolutely beautiful. I’m thinking of organising a one day retreat with Ruby people. Hiking plus Ruby talk.
Please let me know if you’re interested!
Please let me know if you’re interested!
Last 6 months I’ve been working so much that I forgot that I live in such a beautiful place.
Two weeks ago I started to work less and started to go back to running twice a week.
Two weeks ago I started to work less and started to go back to running twice a week.
November 16, 2025 at 12:35 PM
Also for the Ruby people in Madrid. That mountain chain in the back is called La Pedriza and it is absolutely beautiful. I’m thinking of organising a one day retreat with Ruby people. Hiking plus Ruby talk.
Please let me know if you’re interested!
Please let me know if you’re interested!
Last 6 months I’ve been working so much that I forgot that I live in such a beautiful place.
Two weeks ago I started to work less and started to go back to running twice a week.
Two weeks ago I started to work less and started to go back to running twice a week.
November 16, 2025 at 12:32 PM
Last 6 months I’ve been working so much that I forgot that I live in such a beautiful place.
Two weeks ago I started to work less and started to go back to running twice a week.
Two weeks ago I started to work less and started to go back to running twice a week.
For the Madrileños here. A friend of mine is going to give a concert with his new band the 4th of December in Madrid.
I'm going!
Ticket available here: linktr.ee/elerror
And their newly released song is on there as well.
I'm going!
Ticket available here: linktr.ee/elerror
And their newly released song is on there as well.
el error | Instagram, Facebook | Linktree
Powertrio de punkrock en español con matices de hardcore y pop vomitado. Eclécticos, como buenas hijas del siglo pasado no nos gusta las etiquetas, ni las bios.
linktr.ee
November 13, 2025 at 12:14 PM
For the Madrileños here. A friend of mine is going to give a concert with his new band the 4th of December in Madrid.
I'm going!
Ticket available here: linktr.ee/elerror
And their newly released song is on there as well.
I'm going!
Ticket available here: linktr.ee/elerror
And their newly released song is on there as well.
Creating a Zapier integration is... time consuming... 🤪
November 13, 2025 at 12:09 PM
Creating a Zapier integration is... time consuming... 🤪