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Sebastien Castiel

@scastiel.dev
274 followers 582 following 63 posts

📍Montreal · I write about what I learn and build · Passionate software developer · scastiel.dev · My current project: spliit.app

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Sebastien Castiel @scastiel.dev · 14/08/2025
Was skeptical of AI coding after trying Copilot once. Forced myself to use Cursor for 2 hours on real work. Completely changed my mind. Good prompting is its own craft. Now I love these tools but have no clue what my job looks like in 5 years. betweentheprompts.com/two-hours/
betweentheprompts.com
Two Hours with Cursor Changed My Mind About AI Coding
For the first time in my career, I have absolutely no idea what the software engineer job will look like in five or ten years. I’ve always loved coding. All of it. I love making apps from scratch as m...
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Sebastien Castiel @scastiel.dev · 02/12/2024
Already 300 downloads for Spliit.app iOS application 🤗
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Sebastien Castiel @scastiel.dev · 16/11/2024
I started Spliit.app, my open source alternative to Splitwise, a year ago. This week, I released a first beta of the mobile app 🥳 apps.apple.com/us/app/splii...
apps.apple.com
‎Spliit - Shares Expenses
‎Spliit is a hassle-free, ad-free app to split expenses seamlessly with friends and family! Whether it’s for trips, dinners, or any shared cost, Spliit helps manage contributions with custom group fea...
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Sebastien Castiel @scastiel.dev · 18/10/2023
200 downloads already for my new book! I listed all the advice I gave to developers about pull requests and code review over my years of experience and just put everything into a short guide (37 pages). Download it for free and tell me what you think about it! scs.tl/book-pr
scs.tl
Pull Requests and Code Review: Strategies, Techniques, and Best Practices for Collaboration
Unlock the secrets to masterful pull requests and collaborative code reviews with practical insights from years of experience, all packed in one comprehensive guide!
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Sebastien Castiel @scastiel.dev · 17/10/2023
Would you like to become better at crafting pull requests and reviewing code? Here are the 13 tips from my latest book that you can use in your daily developer activity: scastiel.dev/13-tips-for-...
scastiel.dev
13 tips for better Pull Requests and Code Review
Would you like to become better at crafting pull requests and reviewing code? Here are the 13 tips from my latest book that you can use in your daily developer activity.
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Sebastien Castiel @scastiel.dev · 14/07/2023
There is something coming next week 🤫
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Sebastien Castiel @scastiel.dev · 03/07/2023
Server Components & Server Actions make the user and the developer experience better. A bit early to say they’ll change the way we build web apps on the long term, but I would take that bet! 📝 My new blog post about React and @nextjs.org! scastiel.dev/server-components-acti…
scastiel.dev
Intro to React Server Components and Actions with Next.js
React is living something these days. Although it was created as a client UI library, it can now be used to generate almost everything from the server. And we get a lot from this change, especially wh...
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Sebastien Castiel @scastiel.dev · 20/06/2023
My post about the new learning path I propose for React made it to the featured posts of the week on @dev.to 🎉 👉 dev.to/scastiel/a-better-learning-p…
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Reposted by Sebastien Castiel
Sebastien Castiel @scastiel.dev · 26/05/2023
I just wrote a short post with my thoughts about how React Server Components and @nextjs.org can help us teach/learn React a better way: scastiel.dev/better-learning-path-r…
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Sebastien Castiel @scastiel.dev · 26/05/2023
I just wrote a short post with my thoughts about how React Server Components and @nextjs.org can help us teach/learn React a better way: scastiel.dev/better-learning-path-r…
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Sebastien Castiel @scastiel.dev · 26/05/2023
Would you like to learn React and Next.js? I’m designing a workshop to help developers who know HTML, CSS and JavaScript climb the next step and build their first full-stack application with the most popular framework today.
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Sebastien Castiel @scastiel.dev · 24/05/2023
I’m drafting a workshop to help beginners learn React and @nextjs.org, and I couldn’t agree more with  the point @shadcn.com made on Twitter: “An interesting side effect of RSC is that React is now actually easier to teach/learn.”
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Reposted by Sebastien Castiel
Sebastien Castiel @scastiel.dev · 02/05/2023
⭐️ 5 reasons to get a frontend dev mentor: 1️⃣ Personalized learning 2️⃣ Expert knowledge 3️⃣ Job search help 4️⃣ Continuous support 5️⃣ Accountability & motivation Excited to offer long-term mentoring for devs: 1-on-1 sessions, job guidance & unlimited chat support! 💻 🚀 👉 scastiel.dev/mentoring
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Sebastien Castiel @scastiel.dev · 02/05/2023
⭐️ 5 reasons to get a frontend dev mentor: 1️⃣ Personalized learning 2️⃣ Expert knowledge 3️⃣ Job search help 4️⃣ Continuous support 5️⃣ Accountability & motivation Excited to offer long-term mentoring for devs: 1-on-1 sessions, job guidance & unlimited chat support! 💻 🚀 👉 scastiel.dev/mentoring
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Sebastien Castiel @scastiel.dev · 01/05/2023
What would you like @vercel.com to announce for the rest of this Vercel Ship week? I’ll start: an authentication solution, aggregating OAuth providers + username/password + password-less, compatible with Auth.js 🤞
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Sebastien Castiel @scastiel.dev · 01/05/2023
Quick, I need an idea for a tiny side project to play with @vercel.com Storage! 🤩
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Sebastien Castiel @scastiel.dev · 01/05/2023
My latest blog post about React Server Components is featured in another newsletter: React Digest reactdigest.net
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Sebastien Castiel @scastiel.dev · 27/04/2023
Are you a developer looking to level up your skills and land your dream job? Whether you're new to the field or looking to expand your existing skills, I can help 👉 scastiel.dev/mentoring
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Sebastien Castiel @scastiel.dev · 27/04/2023
What if @bsky.app was nice not *in spite* but *because* of the invite model, and because invites are rare? To be here, you have to really want it, and convince someone you are worth an invite… Could it be why people are so nice here?
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Sebastien Castiel @scastiel.dev · 26/04/2023
Finally a good use case for an open API 😂
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Sebastien Castiel @scastiel.dev · 26/04/2023
My blog post about React Server Components is in the latest issue of This Week in React newsletter 😍 thisweekinreact.com/newsletter/143
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Sebastien Castiel @scastiel.dev · 26/04/2023
Do you use TypeScript? If you’ve never tried Zod to supercharge your code, you’re missing something! And you can use it for more than validating user input 😉
scastiel.dev
Using Zod & TypeScript for more than user input validation
If you have ever created an API or a form accepting user input, you know what data validation is, and how tedious it can be. Fortunately, libraries can help us, such as Yup or Zod. But recently, I realized that these libraries allow patterns that go much farther than input validation. In this post, I’ll show you why I now use them in most of my TypeScript projects.
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Sebastien Castiel @scastiel.dev · 25/04/2023
Giving Arc browser a new chance (wasn’t convinced at first try). I think my favorite feature so far is this window when you click a link in a pinned tab!
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Sebastien Castiel @scastiel.dev · 25/04/2023
Anyone from Montreal 🇨🇦 around here?
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Sebastien Castiel @scastiel.dev · 25/04/2023
Three years ago I made this small app to make slides on top of Excalidraw. Thanks to a tweet it’s getting quite some attention today 😁 excalidraw-slides.netlify.app
excalidraw-slides.netlify.app
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Sebastien Castiel @scastiel.dev · 24/04/2023
Finally here! 👋 I read and post stuff about frontend dev: React, TypeScript, Next.js… And some side projects too 😊 For this first post, here is an article I published today: scastiel.dev/view-counter-react-ser…
scastiel.dev
Display a view counter on your blog with React Server Components
A short tutorial with a cool use case for React Server Components, Streaming and Suspense with Next.js: adding a view counter on a blog, calling the Plausible analytics API.
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