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Krasimir

@krasimir

Senior engineer. Book author. Speaker. Serial SaaS builder.

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27.07.2023
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Latest posts by Krasimir @krasimir

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Posting this to mark the day I wrote my first skill. Not gonna lie. It’s fun. And honestly a bit mind-blowing. Natural language is becoming part of everything. The clearer you express your thinking, the better the software behaves.

New advice for 2026:
read more books and expand your vocabulary. πŸ“š

09.03.2026 07:28 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I can relate a lot to this fella. The truth tho is that we still have to pay bills and eat, so whether we want to or not, we have to take that train πŸ‘‰ www.youtube.com/watch?v=pzkw...

08.03.2026 13:31 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Nice try dear AI. Now let's talk about production. Nice try dear AI. Now let's talk about production. / Just recently I wanted to write a script that uploads a directory to S3. I decided to use Copilot. I have been using it for a while. This article i...

Just recently I wanted to write a script that uploads a directory to S3. I decided to use Copilot. It's my attempt to prove two things: (a) that AI can't (still) replace me as a senior software engineer and (b) that it still makes sense to learn programming.

krasimirtsonev.com/blog/article...

22.02.2026 12:47 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Finally. Holding a printed copy of my fifth book πŸ“–βœ¨
β€œPocket Guide to Seniority”. A short, practical read with my tips on growing into a senior engineer.

Written on and off for 2 years. ~60 pages. Quick read.

πŸ‘‰ seniority.krasimirtsonev.com

29.01.2026 10:12 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Alex Honnold BEST MOMENTS Free Soloing Taipei 101 | #SkyscraperLIVE | Netflix
Alex Honnold BEST MOMENTS Free Soloing Taipei 101 | #SkyscraperLIVE | Netflix YouTube video by Netflix Sports

These two things:
"For every hard pitch I’ve soloed, I’ve probably soloed a hundred easy pitches."
"I differentiate between risk and consequence. Sure, falling from this building is a high consequence, but, for me, it’s low risk." (because he's well prepared)

www.youtube.com/watch?v=KkVZ...

27.01.2026 08:29 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Just to remind you that we did have server-side JavaScript 25 years ago ... Nothing new really ... just well-forgotten old.

24.01.2026 08:32 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Streaming JSON in just 200 lines of JavaScript Streaming JSON in just 200 lines of JavaScript / I was continueing my exploration of React server components when I stumbled upon on this article about progressive JSON. Dan Abramov describes a techni...

New blog post πŸ”₯

"Streaming JSON in 200 lines of JS"
πŸ‘‰ krasimirtsonev.com/blog/article...

React Server Components brainrot led me here.
Also yes, I made an npm package. It’s called Streamson 😎

#JavaScript #HoldMyJSON #YetAnotherNpmPackage

06.01.2026 09:24 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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🀦 Remember that quote from Brian Kernighan:

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it."

18.12.2025 07:10 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

When the AI gets confused, it’s usually not thinking β€” it’s mirroring your lack of fundamentals.

Adaptability comes from fundamentals. AI just exposes who skipped them. 😌πŸ”₯

P.S.
Scott at Syntaxfm

16.12.2025 08:00 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Let’s be real, friends β€” most days we just… write code (or stare at it until it fixes itself) πŸ™‚

P.S.
And yes, of course I generated the version on the right with my personal AI assistant. It knows me a little too well, doesn’t it? πŸ˜„

09.12.2025 07:43 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Admit it - you like #JavaScript! It’s fine, this is a safe space ... confess the truth. You write JavaScript.

P.S.
@JSTalks

08.12.2025 08:49 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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🏁 Wrapped up my final workshop of the year - the grand finale of β€œKrasimir talks about SSR until someone stops him.”

See you in 2026 β€” and yes, you can hire me to bring this workshop to your event. πŸš€

05.12.2025 08:09 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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JavaScript has its 30th birthday today! πŸŽ‚ I'm attaching a function that calculate its age πŸ˜‚.

In its lifetime it has given us:
- Pop-up ads πŸ‘€
- jQuery magic ✨
- Callbacks 😡
- Promises πŸ™‚
- async/await 😍
- ... and React hydration errors 🀬

What a journey. Happy 30th Birthday, you chaotic legend!

04.12.2025 12:26 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Fundamentals, practice and progress: Lessons from 20+ years of change May 27-29, 2026

🎒 20 years of web dev chaos and β€œwait… what” moments.

At WebExpo 2025, @krasimir.bsky.social zipped us through the web’s origins. πŸ¦• The first surviving webpage, early Ajax, the rise and fall of Flash and the reminder that HTML, CSS and JS still carry everything.

02.12.2025 07:26 πŸ‘ 2 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
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πŸš€ Had a blast at #JSTalks2025!
MC-ing, a talk, an AI panel, and tons of great JavaScript vibes.
Huge thanks to Mihail Mateev, Piya Khongcharoen & team for the flawless event.
Saw old friends, made new ones β€” can’t wait for next year! πŸ™Œ

01.12.2025 09:35 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Learn from @krasimir.bsky.social, Author & JavaScript Expert, how to build Vanilla Server Components in React - no framework needed!

🧩 Dive deep into server-side rendering with pure JS & Node.

Join https://reactadvanced.com/

21.11.2025 14:01 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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πŸ”₯ OMG big announcement time (AI told me to start with enthusiasm) πŸ”₯

I’m speaking at @webexpo.bsky.social 2026 in Prague πŸ‡¨πŸ‡Ώ β€” May 27–29!

Talk: β€œJavaScript: Weird by design and we ❀️ it”

AI wrote this post. I ruined it. We’re a team now.

🎟️ webexpo.net/tickets/

#WebExpo #JavaScript #AIWroteThis

12.11.2025 09:42 πŸ‘ 4 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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🀘There are just two weeks till JSTalks. The schedule is up at www.jstalks.net/schedule. Make sure that you stop by if you are in Sofia on the 29th of November. All day #JavaScript! I'm wrapping up my slides and want to share a sneak peek. I'm almost sure that your apps looks similar. Isn't it? 😎

10.11.2025 08:11 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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πŸš€πŸ€© I'll be leading a free online workshop on 4th of December as part of React Advanced Conference. We'll be exploring server-side rendering. Don’t miss out – grab your conference ticket to attend here reactadvanced.com

P.S.
By the way, you could attend remotely!

29.10.2025 14:02 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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πŸš€πŸŽŠ Hey, world. I'm starting the week with a huge announcement. I'm turning a new page in my career. I'm now a proffesional "vibe code restoration specialist". I'm here now to read, understand and fix the code that AI generates. Wish me luck🀞.

06.10.2025 06:31 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Great talk by @krasimir.bsky.social! Learn how to apply #React principles beyond React projects for scalable, maintainable codebases in front-end JavaScript tasks.
https://gitnation.com/contents/using-react-without-using-react

29.09.2025 14:00 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Messenger It's a small planet, but someone's gotta make the deliveries.

Holy cow ... done with WebGL and Three.js πŸ‘‰ messenger.abeto.co

28.09.2025 07:52 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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React Server Components support Can I use React Server Components (RSCs) today. A project that shows the support of RSCs across the frameworks and libraries.

Spent the weekend testing React Server Components support across popular frameworks πŸ‘‰ rsc.krasimirtsonev.com

Results:
βœ… Next.js, Vite, Waku (100%)
⚠️ Forket, Parcel, ReactRouter, RedwoodSDK (83%)

Tests: rsc.krasimirtsonev.com#testcases

Know another RSC-ready lib? Ping me!
#ReactJS #javascript

15.09.2025 12:04 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
AgentHopper: An AI Virus (Proof-of-concept Research Project)
AgentHopper: An AI Virus (Proof-of-concept Research Project) YouTube video by Embrace The Red

HA! It was about time ... AI agent injection www.youtube.com/watch?v=vlF0...

13.09.2025 13:40 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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React Server Components support without a framework React Server Components support without a framework / I was at ReactSummit this June and spoke with some folks from Vercel about Next.js and RSC support outside of the framework. I really wanted to tr...

Here's my new and shiny library - Forket and its story krasimirtsonev.com/blog/article...

It's about supporting React Server Components without a framework. #rsc #react #javascript

02.09.2025 19:40 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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The online world is changing for good or bad. Here's a new kind of service - translate every site to a simplified markdown. My own looks like this into.md/https:/krasi...

02.09.2025 04:46 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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State of CSS 2025

For those of you that write #CSS. Pretty interesting findings in here 2025.stateofcss.com/en-US/

29.08.2025 11:11 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

What a nice little app I found - a cool way to create some sort of a digital signature based on your name πŸ‘‰ signature.cnrad.dev

18.08.2025 08:52 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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πŸš€Excited to lead a React Architecture Masterclass this October in Amsterdam – together with the amazing folks at @triforkams! πŸŽ‰

2 days of patterns, SSR, RSC, state mgmt, testing & real-world app building.

Let’s level up together! πŸ’ͺ trifork.nl/academy/our-...

#React #Amsterdam

30.07.2025 12:30 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Today’s β€œHow the hell didn’t I know about that?” moment: we can use the hidden attribute on any HTML element to hide it. Until now, my go-to method was using display: none.
More about it here: developer.mozilla.org/en-US/docs/W...

13.07.2025 17:21 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0