Building @Mastra - teaching you how to build agents along the way
London
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- Followers 9,187
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Build Claude Code for X with Mastra!
Excited to share Mastra's new AgentController
It's a control layer for building products where users and agents collaborate over time
Coding agents are the familiar example but the pattern applies far beyond code - finance workflows, research assistants, legal review, security agents, engineering tools, and other expert systems.
In this video, I build a blog post-writing harness:
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You don't need a Computer Science degree to become a hireable programmer.
That's it. That's the Tweet.
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Our culture is youth-obsessed.
It's always "14-Year-Old Prodigy Programmer Dreams In Code" or "16-Year-Old Dropout is CEO of Company Worth Millions"
Never "28-Year-Old Person Learns to Code and Starts a Steady And Profitable Career Where They Feel Valued and Have a Life"
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Junior developers do not know their worth but I am going to convince you!
Here are 9 unspoken reasons companies need juniors and why you should feel empowered to negotiate:
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We built an open source Slack clone complete with:
👉 Private rooms
👉 Rich media attachments
👉 Typing indicators
👉 Read receipts
... All powered by @ReactJS and Pusher Chatkit 💪
Source code: github.com/pusher/react-slac…
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Here it is 🎉!
A comprehensive (and ambitious 🥵) JUNIOR Web Developer checklist
Years of experience is too vague to measure skill.
I hope this template I made with @Scrimba gives your SPECIFIC ideas about what to learn next 🌱!
different-marmoset-f7b.notio…
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Saying JavaScript is better than PHP is like saying English is better than Spanish.
Literally makes no sense.
You could write the next great novel in either English or Spanish.
You can write the next great app in any JavaScript or PHP.
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It's always, "how do I get a dev job?"
Never, "how do I become a talented and collaborative developer companies *want* to work with?"
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I went IN-DEPTH to find the best sites to to find junior developer jobs.
Made sure to include some niche ones where you can sidestep the competition 👏💯!
Here you go:
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I saw a viral post that said “MCP is just an API”
That is wrong and misleading ❌
I recorded a highly-detailed video to explain the difference and why it matters
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Still working out the deets but you can now look forward to a special @Scrimba space this Thursday where we will invite newer developers to share their story so far 🌱
We're all going to make a bunch of new friends and learn a lot in the process 👇🏻
🔗 nitter.app/i/spaces/1jMKgendkPgJL
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How do you remember the order of
padding: 10px 10px 10px 10px
I always think north east south west
I also heard someone picture it like a clock
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An interviewer asks, "what are your biggest weaknesses?"
What do you say?
Cliche answers only 😂👇
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I'm joining @mastra to help teach developers how to build awesome AI agents with TypeScript! 🎉
I'll be creating videos, hosting workshops, helping the community, and using what I learn to drive product improvements.
Genuinely stoked to help make Mastra the obvious choice!
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Hacktoberfest could be the perfect opportunity for you to contribute to open source 👻
But where to start?
Tomorrow @eddiejaoude @FrancescoCiull4 and @yosracodes will join me to illuminate the way 🔦🎃
Set a reminder here 👇
nitter.app/i/spaces/1PlJQavoLRWJE
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In tomorrow's weekly @Scrimba Space @RybaLeanne and I will be joined by Austin Henline from @LinkedIn.
Join us and learn how to make your LinkedIn profile standout to recruiters 🤩
Set a reminder below 👇🏻
nitter.app/i/spaces/1ypJdEoVooNxW
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I got some interesting advice today:
When an interviewer asks, "what's your weakness?", interpret the question in practical terms rather than in terms of personality faults.
For example, "I don't have much knowledge of <specific aspect of job> so it would take me time to learn"
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I studied the @Better_Auth documentation back to front then turned everything I learned into the most information-dense and clear 20 minute introduction possible
My first personal channel video in 9 years btw 😱
Check it out!
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Somehow I don't think the Pomodoro technique was invented for programmers 🍅
It take me ~25 minutes to get in the zone!
Now I'm meant to start again??
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Tomorrow @RybaLeanne and I are hosting a Space on how to break into tech 💯
We'll be joined by the awesome @RenoPerry who used to work at LinkedIn and now helps people break into tech full-time
See the time and set a reminder 👇
nitter.app/i/spaces/1RDGlgkLZNEKL
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Today I learned CSS was invented by a Norwegian named Håkon Wium Lie
Cool because @Scrimba is also Norwegian 🇳🇴
Apparently W3Schools is Norwegian too but we don't talk about that 🤫
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Exciting news! 🎉
This month I joined @clerk as a Senior Content Engineer!
Stoked to join such an ambitious team and take my content creation to the next level 🔥
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Which is better for beginners?
🔺 Angular
⚛️ React
🧩 Vue
I wrote a 3000 post word on the topic but I can sum it up in a Tweet:
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You built a @Mastra agent, now you need a UI
Good news -
Mastra works brilliantly with AI SDK UI, CopilotKit, and Assistant UI
To make your implementation easier we just released an open-source demo showing each with conversational (streaming) and generative UIs 👇🏻
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Skill bars decrease your chance of getting hired.
If you think you're a 9/10 at JavaScript, you're probs not.
It's an example of the Dunning-Kruger effect where you don't know what you don't know.
If you really knew, you'd be a 4/10 and that hardly sounds impressive, does it?
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Anthropic's Skills are cool but I’m honestly more impressed by the their built-in code execution tool 👀
You can run arbitrary Python in a sandbox, write to disk, and use their file API to download it
Here's an example @mastra agent that happens to use the new pdf skill
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Tom makes six-figures annually as a freelancer 💸
His inbox looks like this and I wanted to learn how.
Here are my key take-aways from our chat 👇🧵
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My video on how to build a junior developer portfolio that will actually get you hired is about to cross 100K and will be the first @Scrimba video to cross that threshold 🎉
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say hello to @Mastra Studio!
an interactive environment for building and testing your agent
now shareable with your team - just copy the link
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I'm moving on from @clerk and exploring new opportunities!
I learned a tonne, and I’m excited to bring this experience to my next role.
If you’re building for developers and need a technical marketer or community lead, let’s talk!
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In 2021..
✅ I found a voice on tech Twitter
✅ Helped grow the @Scrimba community from 6000 to 17000 members
Before then I found communities a bit clique and hard to approach
Exited to share what I learned later today (remember to set reminder!) 👇🏻
📢 DevSpace #6 📢
💬 Dos & Don'ts of Being an Active Member of a Community
⏰ Today (Weds, 9th February) @ 6 pm GMT
Co-Host: @ewainy
🎤: @bookercodes & @kacieahmed
🔔 Set your reminder in the tweet below. 👇
We look forward to seeing you there. 😄
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Here are *ten* realistic JavaScript project ideas for anyone looking to land their first job in tech (with explanations)
🧵👇🏻
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Just published: How to Build and Publish ES6 npm Modules Today, with Babel: booker.codes/how-to-build-an…
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Send me your junior developer portfolio and I might review it in an upcoming YouTube video 😀
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5./ You bring a fresh perspective
Juniors ask "dumb" questions everyone else is too smart to ask
This may lead to improvements in the team's onboarding, tools, documentation, and processes, which the whole team and future hires benefit from
You may introduce trendy tech 👍🏻
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Just had a call with someone who learned to code in 2 months and I am really impressed
He shared with me how he got a 100K salary at a top tech company before the age of 25:
1. Leet code every morning
2. Stock up on Udemy courses
3. Cold showers
4. Dad owns tech company
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Say it with me:
Companies hire Juniors for their potential NOT their experience
Competence + Enthusiasm + Commitment + Humility = Potential 🌱
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I am going to hand them a card from my pocket that reads "My biggest weakness is that I'm overprepared"
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Florin Pop is a #JavaScript developer who made $20k in August without a boss or freelance clients 🧵👇
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This year 43 @Scrimba have been hired so far ⭐️!
By month:
Jan: 11
Feb: 7
March: 16
April so far: 9
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1./ Senior developers need someone to delegate to
Many tasks don't require the breadth of experience senior developers have.
Maybe they are repetitive or not v meaningful to an experienced person but good for new hires cutting their baby teeth 😬
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I love celebrating young people who learn to code!
But let's also celebrate those with the courage to change career at 30.
Show me the 50 year old who followed their passion.
Why should you stop learning new things because you're 70?
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Learning should be fun 🙌!
So many online coding courses and platforms are serious and intimidating.... You will never find that at @Scrimba
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Absolutely massive congratulations to Anthony from the @Scrimba community 🎉!
He just got his first developer job thanks to Scrimba!
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Realistic Lofi girl generated with stable diffusion (Control Net) 😱
Prompt and setting below 👇🏻
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6./ Vitality
After coding for so many years, seniors can get a bit grumpy 😂
Juniors bring boundless enthusiasm and curiosity that reminds seniors why they started and how far they've come
This can have an extremely positive impact on the environment and team performance
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4./ Juniors level up seniors 📈
When seniors teach, they have to test their own understanding. Can they explain it simply?
Managers can tactifally plant Juniors to challenge seniors to be the best they can be 🌱
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i watched the first episode and I can’t help but feel this your best work yet
not just the production quality but the level of teaching and camera presence
great work Lee 💯
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Mastra + Next.js (+ AI SDK UI / AI Elements) in 90 seconds flat following our new quickstart
What quickstart should I write next?
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Just hosted a realistic mock React interview with @Scrimba student @Stefania_Rosca and @cassidoo 🎉
Stefina was an awesome sport 👏 and showed us how to handle tough questions 🥵
Cassidy ran the interview like a real one - sharing awesome feedback and more 💎
Who's excited?
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hey friends, this month I'm working with @mastra to help them launch templates!
there are many new templates to talk about, but my favourite is this text-sql one we built
never write a sql query again! just query the db in natural language 🚀
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Maturing is using a GUI for Git instead of typing
git add -A .
git commit -m "some commit msg"
git push origin main
A thousand times over
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10K views in 10 days 🍾
If you haven't seen it yet my self-taught developer checklist with @Scrimba seems to be helping a lot of people 👇🏻
piped.video/p1zJExpDvxs
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Small but mighty career tip:
When you find a promising job on a platform like @LinkedIn or @Glassdoor, look for the "job reference number"
Use that reference number to search the job listing on the companies website.
You'll have a better chance of success if you apply there.
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When you're stuck on a coding problem, try taking a break.
Yes, really!
You might be surprised to return to the computer and find you know the answer.
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The @Scrimba blog is starting to take shape 👀
What should we write about and would anyone be interested in contributing posts that help developers at the beginning of their web development journey?
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Some other things to remember:
- Research the market rate in your area and industry
- Remember to balance salary with happiness and career trajectory
Sometimes companies looking for a blank canvas use an ancient technology no one else will use lol
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I want to meet you and learn how you're getting on.
Not sure but maybe you'll find someone to help you with whatever you're challenge is
Impromptu, friendly and causal space happening in 1.5 hours
nitter.app/i/spaces/1PlKQazNdjVKE
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Should I share the video of my first talk?
It's so awkward lol
I want to show we all start somewhere but not embarrass myself either 😄
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Wonderful news for @Scrimba users:
We remade module 6: Next-level JavaScript to incorporate more hands-on challenges 🎉
All the credit goes to @TomChant who's been working on this for almost 3 months
Awesome work Tom!
scrimba.com/learn/frontend
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I implore anyone learning to code to also learn how to learn.
Did you know, for example, there are two modes of learning: focused and diffused.
Focused means actively consuming or recalling.
Diffused is when your mind wonders. You synthesise and connect information then.
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2./ Alturism
Throughout the ages there have been masters leading groups of apprentices and journeymen. It's human nature.
Companies are people and people appreciate, like them, we all start somewhere.
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Are you skilful enough to code a website like this?
If so, congratulations! You are ready to build a $46K website
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Well it was bound to happen eventually!
After 50 episodes of the @Scrimba podcast I finally forgot to press record 🔴
Guess I was nervous talking to one of my own programming heros @shanselman 🙂🔫
🤣😆😄🤭😔😭😭😭
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3./ Investment
Hiring juniors is a great way to find up-and-comers and turn them into great developers
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Last year, @cassidoo and I collaborated on some epic, free resources that might help you ☃️
Common React interview questions and vetted, eloquent answers to rehearse ↘️
dev.to/scrimba/react-intervi…
Here's what to expect from a React interview ↘️
dev.to/scrimba/here-s-what-t…
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With all the web3 stuff happening, it's easy to feel FOMO.
Remember your goal.
If you want to become a junior dev, companies aren't yet hiring web3 devs (not really)
Anyway, web3 will always need a frontend and that's HTML,CSS,JS all the way!
These skills are future-proof.
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I am going from AI noob→expert and sharing what I learn in public
I hope you'll join me on the journey
icymi @bookercodes joined mastra and has been dropping videos every week on our youtube channel: piped.video/@mastra-ai
linking a few of our other faves by him below
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Next week I will be recruiting some experienced writers for the @Scrimba blog
Of course you can always message me early with some examples of your writing if you're keen
Will pay handsomely 💸
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Just launched my own portfolio 🎉
Is it perfect? Nope
Is done better than perfect? Hell yeah
This is (almost) enough to get the job done. Now I can iterate on my own time ♻️
bookercodes.github.io/
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Since applying for jobs is basically a number game, you should know all the best websites to find entry-level Junior Developer jobs.
Here you go!
In my newest @Scrimba post I show them all:
🔗 scrimba.com/articles/where-t…
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In the @Scrimba community, we believe in helping one another, even when we only know a little more than the person behind us 💪
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Major upgrade to @mastra docs this month 👇🏻
• Overhauled content - now easier to parse and digest
• Migrated to @docusaurus - faster loads
• Re-implemented search and added an AI sidebar with @kapa_ai
We called this initiative Docstoberfest. Here's what's new -
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Really impressive turn out for the ✨first ✨ @reasonml London meetup
@marcelcutts is killing it with his introductory talk 💪
#ReasonLDN
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Was my pleasure to interview @SHanselman on the @Scrimba podcast 🎙
You can listen to the full episode below 👇
🔗 scrimba.com/podcast/how-to-b…
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. @RybaLeanne and I are hosting a Space on non-technical interview questions and how to answer them.
We'd love for some guests to join us! Just respond 👇
Fun idea: We treat each question like a one-question mock interview to hear your best response.
nitter.app/i/spaces/1mnGedZVNERKX
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As a new developer it's important you start every morning with some positive morning affirmations
Undefined is a function if you will it to be!
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9./ Blank canvas
Many times it is easier to draw on a blank piece of paper than to update an existing sketch.
A lot of companies want someone whose mouldable who they can train to do things the way they want, not the way some other company did things.
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Will AI replace programmers?
Not a chance.
Will AI be used by developers?
One million percent, yes.
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Seen a few people ask how to use @mastra with AI SDK UI
I made an example with React and Vite to show you how 👇🏻
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8. / Quick and available
It's very hard to find experienced developers in the job market at the moment.
Some companies are now hiring 2-3 juniors instead.
Hiring juniors is a bit less risky since they're cheaper and won't play a pivotal role at first
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🔺 Angular is awesome... But the learning curve is too steep.
It has to come down to ⚛️ React or 🧩 Vue.
They're comparable in so many ways!
Ultimately ⚛️React has SO many more jobs.
⚛️ React takes the cake in my view.
What do you think?
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I might be a bit biased but we generally do have the world's best coding teachers at @Scrimba 🙌
@bobziroll @perborgen @KevinJPowell @designcoursecom @cassidoo @RandallKanna
Also very happy to welcome @Tpchant to the roster as a full-time teacher and my newest co-worker 👋
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Just published a new post on the @Scrimba blog 🚀
It's about how I would become a Web Developer in 6 months if I had to start from scratch knowing what I know today:
🔗 scrimba.com/articles/become-…
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According to my hiring manager friends, 90% of junior developer resumes look generic.
Imagine, then, how memorable you will be if you can stand out with a unique project, accreditation, or story (it doesn't even have to be about tech)
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A special event calls for special attire ✨
Rocking my @reasonml for @ReasonLDN tonight. Who else wants one 👕?
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Just had a wonderful chat with @KevinJPowell about CSS4
Coming soon on the @Scrimba podcast 👉 scrimba.com/podcast
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To become a top-paid developer you *have* to be passionate about code
☝🏻 Is such a bad take!
I spoke with the founder of of @CodeNewbies - the awesome @saronyitbarek - to dispel this statement once and for all 👇🏻
🔗 scrimba.com/podcast/saron-yi…
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