Maciej Trzciński

Postgres day 2/90 If subquery can return NULL don’t use NOT NULL Example: SELECT * FROM users WHERE id NOT IN (SELECT user_id FROM banned_users); This query can return 0 rows if subquery contains even one NULL Use NOT EXISTS

Postgres day 1/90 NULL means nothing or missing information. Use IS NULL to to return true if value is NULL Use IS NOT NULL to return true if value is not NULL

Code isn’t just syntax — it’s culture. Bad vibes in your repo = slow progress. Good vibes in your repo = clean, fast, scalable code. I help vibecoders and founders keep the vibes high ⚡

You’ve got $10K and 4 weeks to test your idea. Do you: A) Hire an agency B) Build it yourself C) Find a vibecoder to get it live What’s your move?

Building a startup? Vibecoding your repo? Ask me one technical question below 👇 I’ll reply with advice you can use right away.

Vibecoders — drop your repo here. I’ll roast it, but with love. ⚡ 3 things you did right ⚡ 3 things you should fix Who’s brave enough? #CodeReview #Vibecoders #DevCommunity

Founders: if you had to build your MVP in 30 days… What tech stack would you choose? 👀 #Startups #MVP #BuildInPublic

90% of MVPs fail not because of the idea… …but because they were overbuilt. Agree or disagree? #StartupLife #MVP #0toMVP

What’s the worst thing you’ve ever seen in a startup codebase? 👀 (I’ll start: business logic hidden in CSS 🫠) #CodeFails #DevHumor #Vibecoders

Here are some personal rules I follow to do my best work: 🚀 Focus on one top priority task each day 🚫 Avoid working with people who cause stress What are your rules? 🔥

@AndreeaFarcas98 Python, how about you?

What was the first programming language you learned?🥹

@chfsrh Thanks 😊

@NerdMaciej Lovely doggo 🤗

@eddiejaoude It depends on what kind of problem I need to solve. But I prefer ternary.

How do you manage your conditions in React?

@theserkantoplu I can disagree, look at 🇺🇦 or 🇧🇾

When you live in Europe or America. You can’t complain.

For more details, check out the full article: #executing-code-after-a-response-with-nextafter-experimental" target="_blank" rel="nofollow noopener">nextjs.org/blog/next-15-r…

Next.js 15 introduces an experimental feature called next/after, allowing developers to execute code after a response is sent. This API is perfect for tasks like logging or analytics that shouldn’t block the main response. It’s a game-changer for optimizing serverless functions.

@GrowthwithDon Nope. but it’s delicious 🤤

Does coffee boost your productivity?

@Bod_repuplic Oko - in Polish it means eye 👁️

Prove me wrong 👀

@ThePeterMick I completely agree! Adding a personal touch is key, and AI can definitely help enhance creativity and productivity. 🚀However, I sometimes wonder if people are still contributing their own unique ideas. 💡

@NerdMaciej I like to think of it as inspire rather than create, for best results I've always said to add your personal touch, outsource the writing + boost the thinking 🥰 And one way or another people will use AI to do it

Did I just bring this little monster to 2.9 billion users?