David Cossio

software engineer → building cool stuff online | coding and sports are my hobby | cooking Mobile apps & Web apps

[David Cossio @davidcossios]

@mathiasvrb It’s super annoying man, which ones did you tried?

[David Cossio @davidcossios]

Day 0/45 of building and launching my first app ever.

The goal: go from $0 to $1K MRR in 45 days.

I've always hated money-tracking apps because I get bored of manually logging every single expense.

So I'm building my own solution, an app that makes tracking your money effortless, so you can actually understand and manage it better.

I've been really inspired by builders like @levelsio and @marclou, so I figured: why not give it a shot?

I'll be sharing the whole journey here. See you around!

[David Cossio @davidcossios]

It’s amazing how AI can improve your business in just a few weeks.

Earlier this year, I had a landing page for my local business that was completely unoptimized. I had no idea what was actually going on.

A month ago, I decided to rebuild the entire site and give Codex access to Clarity and GA4.

Between that and using some SEO/AEO skills, we’re now getting 7+ clients a day, completely organically.

I know it’s not a huge number, but it feels amazing to see the results.

[David Cossio @davidcossios]

Day 4 of growing my network here on @X 👋

Today, instead of just saying “let’s connect”, I want to discover what you’re actually building. Not the pitch deck version, the real one.

SaaS, indie projects, whatever.

Three things I actually want to know:
What is it?
Who needs it?
Where are you at? (Pre-launch, customers, scaling)

Founders, builders, solopreneurs, this is for you.

Let's see what the network is actually shipping.

[David Cossio @davidcossios]

Serious question for founders: Where did you actually find your first customers?

Did it work because of:
- Reddit posts?
- UGC/organic?
- Paid ads?
- Something else entirely?

Im Asking because there's so much noise. Want to know what actually moved the needle for real projects.

[David Cossio @davidcossios]

@marclou Nicely done my friend!!!

[David Cossio @davidcossios]

@omarvvvr Congrats man!, currently starting from 0 too

[David Cossio @davidcossios]

Hey, I need some help from you guys!

I’ve been seeing people run huge UGC campaigns for their mobile apps, and I’m trying to figure out how to do the same.

The problem: most of these campaigns are targeting the US market.

I’m based in Colombia, so I’m not sure how to test UGC formats that work in the US before spending money on US creators.

What would you do?

[David Cossio @davidcossios]

@ericosiu Yes man!, please

[David Cossio @davidcossios]

First App Store submission incoming. Does anyone have an actual checklist they use? Screenshots done right, metadata, test account setup.

What's the dumb stuff people miss?

[David Cossio @davidcossios]

Me and GPT-6 Astra since it came out:

[OpenAI @OpenAI]

GPT-6 Astra is now available to all Pro, Enterprise, and Business Premium users in ChatGPT Work and Codex. It's also live in the API.

It might take a few days to roll out to our Plus and Business users. Thank you for your patience.

[David Cossio @davidcossios]

Hi, I am David 👋
I'm building and sharing around AI, tech and my journey.

Looking to connect with:

• Builders & Developers
• Founders & Entrepreneurs
• AI enthusiasts
• Creators
• Curious minds in tech

If that sounds like you say hi👋

[David Cossio @davidcossios]

We already got Astra! But I’m already out of messages, and it’s crazyyyy.

[David Cossio @davidcossios]

Holy sht this is fcking crazy!

Watching GPT 6 Astra demos. @bridgemindai had a bug stuck for 6 months. Fable 5.1 threw in the towel. Astra just one shotted it.

The capability jump isn't theoretical anymore.

[David Cossio @davidcossios]

I'm about to show you my path from $0 MRR to Y Combinator.

20, software engineering student in Medellín, Colombia. Shipping an app in a few weeks. Documenting the wins and every mistake along the way.

Follow if you want the unfiltered version.

[David Cossio @davidcossios]

@askOkara launch

[David Cossio @davidcossios]

No te voy a vender nada.
Solo quiero hablar con gente que sí vive el dolor operativo del marketing todos los días.

Si te animas, comenta “feedback” o escríbeme por DM.

[David Cossio @davidcossios]

@yanndine OUTREACH

[David Cossio @davidcossios]

@MichLieben Ads

[David Cossio @davidcossios]

@romanbuildsaas Claude