Darius Cosden 🧑🏻💻
@cosden.dev
Teaching React at @cosdensolutions · 170k subs · Building an AI learning platform
Coding with agents is so much more fun than coding by hand
I thought I would lose the love I had for programming by letting AI do the writing for me
But it turns out, the opposite happened. Watching Opus 4.5 cook is so satisfying
I thought I would lose the love I had for programming by letting AI do the writing for me
But it turns out, the opposite happened. Watching Opus 4.5 cook is so satisfying
January 9, 2026 at 4:02 PM
Coding with agents is so much more fun than coding by hand
I thought I would lose the love I had for programming by letting AI do the writing for me
But it turns out, the opposite happened. Watching Opus 4.5 cook is so satisfying
I thought I would lose the love I had for programming by letting AI do the writing for me
But it turns out, the opposite happened. Watching Opus 4.5 cook is so satisfying
Broke my record, 122 files changed with Opus 4.5 in one prompt
January 9, 2026 at 11:01 AM
Broke my record, 122 files changed with Opus 4.5 in one prompt
Honestly, even if AI models did not improve anymore we'd be good
We can already do so much with them it's insane
But they will improve, and will make a couple of really big leaps this year, which is even crazier
Exciting times ahead
We can already do so much with them it's insane
But they will improve, and will make a couple of really big leaps this year, which is even crazier
Exciting times ahead
January 8, 2026 at 4:00 PM
Honestly, even if AI models did not improve anymore we'd be good
We can already do so much with them it's insane
But they will improve, and will make a couple of really big leaps this year, which is even crazier
Exciting times ahead
We can already do so much with them it's insane
But they will improve, and will make a couple of really big leaps this year, which is even crazier
Exciting times ahead
Knowing how to code is a superpower
Only by understanding the code can you actually use AI agents effectively
If you vibe code, you will vibe yourself into a wall
So glad I have those years of experience already
Only by understanding the code can you actually use AI agents effectively
If you vibe code, you will vibe yourself into a wall
So glad I have those years of experience already
January 7, 2026 at 3:58 PM
Knowing how to code is a superpower
Only by understanding the code can you actually use AI agents effectively
If you vibe code, you will vibe yourself into a wall
So glad I have those years of experience already
Only by understanding the code can you actually use AI agents effectively
If you vibe code, you will vibe yourself into a wall
So glad I have those years of experience already
Hit 500+ users on Cosden Code
Huge milestone for me
Next one at 1k
Huge milestone for me
Next one at 1k
January 7, 2026 at 11:04 AM
Hit 500+ users on Cosden Code
Huge milestone for me
Next one at 1k
Huge milestone for me
Next one at 1k
Learning to code is equally as important as learning how to use AI
Holding on to the past of coding by hand won't get you anywhere
Vibe coding without knowing what you're doing won't either
Here's how I think about React devs in 2026 👇🏻
Holding on to the past of coding by hand won't get you anywhere
Vibe coding without knowing what you're doing won't either
Here's how I think about React devs in 2026 👇🏻
January 6, 2026 at 10:57 AM
Learning to code is equally as important as learning how to use AI
Holding on to the past of coding by hand won't get you anywhere
Vibe coding without knowing what you're doing won't either
Here's how I think about React devs in 2026 👇🏻
Holding on to the past of coding by hand won't get you anywhere
Vibe coding without knowing what you're doing won't either
Here's how I think about React devs in 2026 👇🏻
I finally bit the bullet and went all in on AI development
I was resisting it due to fear but over the holiday break I snapped out of it
Got Claude Max and have been prompting like crazy these past few days
I did not write a single line of code myself
Welcome to 2026
I was resisting it due to fear but over the holiday break I snapped out of it
Got Claude Max and have been prompting like crazy these past few days
I did not write a single line of code myself
Welcome to 2026
January 5, 2026 at 3:56 PM
I finally bit the bullet and went all in on AI development
I was resisting it due to fear but over the holiday break I snapped out of it
Got Claude Max and have been prompting like crazy these past few days
I did not write a single line of code myself
Welcome to 2026
I was resisting it due to fear but over the holiday break I snapped out of it
Got Claude Max and have been prompting like crazy these past few days
I did not write a single line of code myself
Welcome to 2026
How's the air quality where you live?
Here in Belgrade it's pretty bad right now. Can't really go out without a mask
I'm on a hill right now, but I can't see anything below
Here in Belgrade it's pretty bad right now. Can't really go out without a mask
I'm on a hill right now, but I can't see anything below
December 20, 2025 at 2:18 PM
How's the air quality where you live?
Here in Belgrade it's pretty bad right now. Can't really go out without a mask
I'm on a hill right now, but I can't see anything below
Here in Belgrade it's pretty bad right now. Can't really go out without a mask
I'm on a hill right now, but I can't see anything below
Hit $10k total revenue for Cosden Code today 🎉
Really proud of this but there's a lot of work ahead
Will slightly pivot early next year and things should go much better
Let's do this 🤙🏻
Really proud of this but there's a lot of work ahead
Will slightly pivot early next year and things should go much better
Let's do this 🤙🏻
December 18, 2025 at 4:00 PM
Hit $10k total revenue for Cosden Code today 🎉
Really proud of this but there's a lot of work ahead
Will slightly pivot early next year and things should go much better
Let's do this 🤙🏻
Really proud of this but there's a lot of work ahead
Will slightly pivot early next year and things should go much better
Let's do this 🤙🏻
2 weeks post launch MRR update
Things have slowed down quite a bit
Couple potential reasons: no free tier, upcoming holidays, didn't get enough good traffic, not enough content on platform
That's okay, it just means more work to figure this out
If boot dev can do it, so can I
Things have slowed down quite a bit
Couple potential reasons: no free tier, upcoming holidays, didn't get enough good traffic, not enough content on platform
That's okay, it just means more work to figure this out
If boot dev can do it, so can I
December 17, 2025 at 3:56 PM
2 weeks post launch MRR update
Things have slowed down quite a bit
Couple potential reasons: no free tier, upcoming holidays, didn't get enough good traffic, not enough content on platform
That's okay, it just means more work to figure this out
If boot dev can do it, so can I
Things have slowed down quite a bit
Couple potential reasons: no free tier, upcoming holidays, didn't get enough good traffic, not enough content on platform
That's okay, it just means more work to figure this out
If boot dev can do it, so can I
The worst thing that you can do for your React app is to structure your code and files the wrong way
This creates a weak foundation that collapses anytime you add anything to it
You're basically having legacy code from day 1
Here's how to fix that 👇🏻
This creates a weak foundation that collapses anytime you add anything to it
You're basically having legacy code from day 1
Here's how to fix that 👇🏻
December 17, 2025 at 11:03 AM
The worst thing that you can do for your React app is to structure your code and files the wrong way
This creates a weak foundation that collapses anytime you add anything to it
You're basically having legacy code from day 1
Here's how to fix that 👇🏻
This creates a weak foundation that collapses anytime you add anything to it
You're basically having legacy code from day 1
Here's how to fix that 👇🏻
Just added something that I think will really help conversions on Cosden Code
There's now over 250 users on the platform and growing daily
And just now I added a bundle for all yearly plans that gets you my 2 previous full-stack courses
Now is the best time to lock in and join
There's now over 250 users on the platform and growing daily
And just now I added a bundle for all yearly plans that gets you my 2 previous full-stack courses
Now is the best time to lock in and join
December 16, 2025 at 4:03 PM
Just added something that I think will really help conversions on Cosden Code
There's now over 250 users on the platform and growing daily
And just now I added a bundle for all yearly plans that gets you my 2 previous full-stack courses
Now is the best time to lock in and join
There's now over 250 users on the platform and growing daily
And just now I added a bundle for all yearly plans that gets you my 2 previous full-stack courses
Now is the best time to lock in and join
"You need to understand useEffect if you're gonna use AI to code"
That's the line I keep going back to whenever I think about the future of React devs
You can't get away from it. You NEED to understand the code that is being written
If you don't, you're going to have so many problems
That's the line I keep going back to whenever I think about the future of React devs
You can't get away from it. You NEED to understand the code that is being written
If you don't, you're going to have so many problems
December 16, 2025 at 10:59 AM
"You need to understand useEffect if you're gonna use AI to code"
That's the line I keep going back to whenever I think about the future of React devs
You can't get away from it. You NEED to understand the code that is being written
If you don't, you're going to have so many problems
That's the line I keep going back to whenever I think about the future of React devs
You can't get away from it. You NEED to understand the code that is being written
If you don't, you're going to have so many problems
Google Announced their new browser "Disco"
How is no one talking about this?
It literally builds UIs and serves them to users
Where's the "web devs are cooked" posts?
How is no one talking about this?
It literally builds UIs and serves them to users
Where's the "web devs are cooked" posts?
December 15, 2025 at 10:56 AM
Google Announced their new browser "Disco"
How is no one talking about this?
It literally builds UIs and serves them to users
Where's the "web devs are cooked" posts?
How is no one talking about this?
It literally builds UIs and serves them to users
Where's the "web devs are cooked" posts?
The first person to finish all the launch content on Cosden Code 🤯
I was expecting this to take at least 2 months, not 2 weeks
Congrats dude, new course will drop in Jan
Until then, take a break and enjoy the holidays, well deserved
I was expecting this to take at least 2 months, not 2 weeks
Congrats dude, new course will drop in Jan
Until then, take a break and enjoy the holidays, well deserved
December 12, 2025 at 11:03 AM
The first person to finish all the launch content on Cosden Code 🤯
I was expecting this to take at least 2 months, not 2 weeks
Congrats dude, new course will drop in Jan
Until then, take a break and enjoy the holidays, well deserved
I was expecting this to take at least 2 months, not 2 weeks
Congrats dude, new course will drop in Jan
Until then, take a break and enjoy the holidays, well deserved
What's the best way to prefetch your data in Tanstack Start/Router?
The docs all show using "ensureQueryData" but that returns cached data even if it's been invalidated
I'm currently doing "fetchQuery" which accounts for invalidation but it doesn't feel right?
The docs all show using "ensureQueryData" but that returns cached data even if it's been invalidated
I'm currently doing "fetchQuery" which accounts for invalidation but it doesn't feel right?
December 11, 2025 at 11:02 AM
What's the best way to prefetch your data in Tanstack Start/Router?
The docs all show using "ensureQueryData" but that returns cached data even if it's been invalidated
I'm currently doing "fetchQuery" which accounts for invalidation but it doesn't feel right?
The docs all show using "ensureQueryData" but that returns cached data even if it's been invalidated
I'm currently doing "fetchQuery" which accounts for invalidation but it doesn't feel right?
My best performing video in a while
Apparently me moving away from Next.js was all it took
I guess I'll make more videos like this
Apparently me moving away from Next.js was all it took
I guess I'll make more videos like this
December 10, 2025 at 7:27 PM
My best performing video in a while
Apparently me moving away from Next.js was all it took
I guess I'll make more videos like this
Apparently me moving away from Next.js was all it took
I guess I'll make more videos like this
Vibe coding is creating a huge opportunity for those who know to code
Those who take this seriously right now will succeed
I built a complete roadmap on Cosden Code to teach you all the skills you need to be a successful full-stack React developer
Details below 👇
Those who take this seriously right now will succeed
I built a complete roadmap on Cosden Code to teach you all the skills you need to be a successful full-stack React developer
Details below 👇
December 10, 2025 at 11:03 AM
Vibe coding is creating a huge opportunity for those who know to code
Those who take this seriously right now will succeed
I built a complete roadmap on Cosden Code to teach you all the skills you need to be a successful full-stack React developer
Details below 👇
Those who take this seriously right now will succeed
I built a complete roadmap on Cosden Code to teach you all the skills you need to be a successful full-stack React developer
Details below 👇
My most viewed YT short (1.2m views) is me roasting my own code
Every day there are devs out there who see the horrendous code I wrote 8+ years ago
Every day there are devs out there who see the horrendous code I wrote 8+ years ago
December 9, 2025 at 11:04 AM
My most viewed YT short (1.2m views) is me roasting my own code
Every day there are devs out there who see the horrendous code I wrote 8+ years ago
Every day there are devs out there who see the horrendous code I wrote 8+ years ago
Something I want to do more of on my YT channel is to provide value
I learnt this many years ago but didn't keep it top of mind lately
Always start a video with "what value am I giving to the viewer?"
You'll find that will make them watch and come back for more
I learnt this many years ago but didn't keep it top of mind lately
Always start a video with "what value am I giving to the viewer?"
You'll find that will make them watch and come back for more
December 8, 2025 at 10:58 AM
Something I want to do more of on my YT channel is to provide value
I learnt this many years ago but didn't keep it top of mind lately
Always start a video with "what value am I giving to the viewer?"
You'll find that will make them watch and come back for more
I learnt this many years ago but didn't keep it top of mind lately
Always start a video with "what value am I giving to the viewer?"
You'll find that will make them watch and come back for more
Currently not vibe coding in the north of Sweden 🧖🏻♂️
December 6, 2025 at 6:46 PM
Currently not vibe coding in the north of Sweden 🧖🏻♂️
I believe I may have had my first word of mouth sale
Someone purchased using a discount code only sent to a few users and their email is not on that list
So someone must've given it to them
Really cool if true
Someone purchased using a discount code only sent to a few users and their email is not on that list
So someone must've given it to them
Really cool if true
December 5, 2025 at 4:00 PM
I believe I may have had my first word of mouth sale
Someone purchased using a discount code only sent to a few users and their email is not on that list
So someone must've given it to them
Really cool if true
Someone purchased using a discount code only sent to a few users and their email is not on that list
So someone must've given it to them
Really cool if true
Latest YT video did alright
Most views are existing subscribers
Which is great, but I want to reach more new viewers too
Most views are existing subscribers
Which is great, but I want to reach more new viewers too
December 5, 2025 at 11:02 AM
Latest YT video did alright
Most views are existing subscribers
Which is great, but I want to reach more new viewers too
Most views are existing subscribers
Which is great, but I want to reach more new viewers too
YT channel views are also down in the last 90 days
This is mostly due to not uploading videos
I was too busy filming 129 videos for Cosden Code
Time to give YT some more attention
This is mostly due to not uploading videos
I was too busy filming 129 videos for Cosden Code
Time to give YT some more attention
December 4, 2025 at 4:04 PM
YT channel views are also down in the last 90 days
This is mostly due to not uploading videos
I was too busy filming 129 videos for Cosden Code
Time to give YT some more attention
This is mostly due to not uploading videos
I was too busy filming 129 videos for Cosden Code
Time to give YT some more attention
Ok so sales have definitely slowed down after Black Friday launch
That's expected and I'm not mad about it
I'm playing the long game
Time to make great YT videos again
That's expected and I'm not mad about it
I'm playing the long game
Time to make great YT videos again
December 4, 2025 at 11:04 AM
Ok so sales have definitely slowed down after Black Friday launch
That's expected and I'm not mad about it
I'm playing the long game
Time to make great YT videos again
That's expected and I'm not mad about it
I'm playing the long game
Time to make great YT videos again