Sebastien Castiel

betweentheprompts.comTwo Hours with Cursor Changed My Mind About AI CodingFor 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...

14 Aug 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/

2 Dec 2024

Already 300 downloads for Spliit.app iOS application 🤗

apps.apple.com‎Spliit - Shares Expenses‎Spliit 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...

16 Nov 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...

scs.tlPull Requests and Code Review: Strategies, Techniques, and Best Practices for CollaborationUnlock the secrets to masterful pull requests and collaborative code reviews with practical insights from years of experience, all packed in one comprehensive guide!

18 Oct 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

scastiel.dev13 tips for better Pull Requests and Code ReviewWould 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.

17 Oct 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-...

14 July 2023

There is something coming next week 🤫

scastiel.devIntro to React Server Components and Actions with Next.jsReact 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...

3 July 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! https://scastiel.dev/server-components-actions-react-nextjs

dev.toTop 7 Featured DEV Posts from the Past WeekA round up of the most-read and most-loved contributions from the community this past week

20 June 2023

My post about the new learning path I propose for React made it to the featured posts of the week on @dev.to 🎉 👉 https://dev.to/scastiel/a-better-learning-path-for-react-with-server-components-5ebn

DEV Community@dev.to

Congrats to our top authors of the week: Misha, Shai, Emanuele, alakkadshaw, Sebastien, Scott, and Dhruv! Thanks for sharing your insights with the DEV Community 🌟 https://dev.to/devteam/top-7-featured-dev-posts-from-the-past-week-5368

Sebastien Castiel reposted

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: https://scastiel.dev/better-learning-path-react

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: https://scastiel.dev/better-learning-path-react

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.

📕 The slides used during the workshop as a PDF document ⏭️ A list of ideas of what to learn next in your journey 🙋🏻‍♂️ A direct access to me to answer your questions about Next.js or React

Interested in being part of the first cohort and enjoy a discount? Or just want to know more without committing? Drop me a reply 👇 or contact me: scastiel.dev/contact

It will be a remote workshop where after creating our first app, we’ll talk about authentication, databases, forms, and server components. After two 3-hour sessions, you’ll leave with:

🧠 Knowledge of Next.js’ and React’s basics ⚙️ The source code of a project you can use to bootstrap your future apps 🏠 Take-home exercises to put in practice what you learned, with solutions

How is it different from other courses you can find? I take advantage of the latest React and Next.js features to offer a whole new path –a simpler one– to creating your first application. This is why you’ll learn React and Next.js at the same time, where other courses usually start w/ React alone.

24 May 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.”

Then, as a second step, you can learn client features to handle user interactions: local state, DOM events, forms… And it’s only now that you hear the word “hook” for the first time!

24 May 2023

Here is the tweet mentioned: https://twitter.com/shadcn/status/1660338653305114625

twitter.comtwitter.com

Learning server React first, without state and side effect management, just as a rendering engine, is already a huge step. You discover JSX, conditionals & iterations, components, file-based routing, styling, etc.

24 May 2023

Even better: you learn how to fetch the data to display, from the inside component, without performing any additional request.

Sebastien Castiel reposted

2 May 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

I can help with React, JavaScript, TypeScript, HTML, CSS, Next.js and much more! ✨ If you’re bootstrapping your dev career, I will offer you 6 months of Premium mentoring for CA$399 instead of $749! DM for more info 💬

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 🤞

Quick, I need an idea for a tiny side project to play with @vercel.com Storage! 🤩

Vercel@vercel.com

Introducing Vercel Storage ◆ Vercel Postgres: Serverless and Edge-ready SQL ◆ Vercel KV: Durable, global, serverless Redis ◆ Vercel Blob: Fast, simple file storage https://vercel.com/blog/vercel-storage

Yay, @vercel.com Postgres seems to play well with Prisma! https://vercel.com/templates/next.js/postgres-prisma

My latest blog post about React Server Components is featured in another newsletter: React Digest https://reactdigest.net

scastiel.devDisplay a view counter on your blog with React Server ComponentsA 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.

The blog post: https://scastiel.dev/view-counter-react-server-components

27 Apr 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 👉 https://scastiel.dev/mentoring

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?

Finally a good use case for an open API 😂

This post is unavailable.

My blog post about React Server Components is in the latest issue of This Week in React newsletter 😍 https://thisweekinreact.com/newsletter/143

scastiel.devUsing Zod & TypeScript for more than user input validationIf 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.

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 😉

25 Apr 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!

25 Apr 2023

Anyone from Montreal 🇨🇦 around here?

excalidraw-slides.netlify.appexcalidraw-slides.netlify.app

25 Apr 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 😁 https://excalidraw-slides.netlify.app/