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Vinicius Pereira profile picture

Vinicius Pereira

AI and data engineer. RAG, agents, automations, and scraping pipelines, all built with tests and CI. I write about the small reliable pieces I reuse.

Education

B.Sc. Mechanical Engineering, Pontifical Catholic University of Rio de Janeiro

Pronouns

he/him

Work

AI and data engineer, freelance

DEV Weekend Challenge Completion
4 Week Community Wellness Streak
2 Week Community Wellness Streak
Multi-Agent Systems Builder
Cloud Run Badge
1 Week Community Wellness Streak
Writing Debut
My exactly-once refund paid twice, and 373 passing tests could never have caught it

My exactly-once refund paid twice, and 373 passing tests could never have caught it

5
Comments
6 min read

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The ChocoDEV Signature Bar: one chocolate bar, zero images

Frontend Challenge CSS Art Submission 🍲🥧

The ChocoDEV Signature Bar: one chocolate bar, zero images

9
Comments
2 min read
ChocoDEV: a chocolate bar you can eat, in pure CSS

Frontend Challenge CSS Art Submission 🍲🥧

ChocoDEV: a chocolate bar you can eat, in pure CSS

9
Comments
2 min read
Everything that broke when I imported hand-written Make blueprints into a real workspace

Everything that broke when I imported hand-written Make blueprints into a real workspace

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Comments 2
6 min read
Your LLM's confidence score is lying to you

Your LLM's confidence score is lying to you

3
Comments 4
5 min read
Clear the Lineup: the passage my RAG retrieved and then threw away in silence

Summer Bug Smash: Clear the Lineup 🐛🛹

Clear the Lineup: the passage my RAG retrieved and then threw away in silence

7
Comments
7 min read
The night I leaked my own payment key, and what caught it

Summer Bug Smash: Smash Stories Submission 🐛🛹

The night I leaked my own payment key, and what caught it

2
Comments 4
3 min read
I gave my futevôlei crew an AI announcer (DuelUp Live)

DEV Weekend Challenge: Passion Edition Submission

I gave my futevôlei crew an AI announcer (DuelUp Live)

10
Comments 3
4 min read
Lead Quorum: a multi-agent lead qualifier that refuses to guess (ADK + A2A)

Education Track: Build Multi-Agent Systems with ADK

Lead Quorum: a multi-agent lead qualifier that refuses to guess (ADK + A2A)

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Comments 26
4 min read
Your LLM bill has two sides. Build the ledger that shows both.

Your LLM bill has two sides. Build the ledger that shows both.

1
Comments
5 min read
Why is this a 60 and not a 40?

Why is this a 60 and not a 40?

2
Comments 6
5 min read
I wrote a free 84-page handbook to take you from "what is a token" to working AI agents

I wrote a free 84-page handbook to take you from "what is a token" to working AI agents

4
Comments 5
2 min read
You can't debug a RAG you didn't instrument

You can't debug a RAG you didn't instrument

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Comments 28
3 min read
Sonnet 5 dropped today. Watch the other hand.

Sonnet 5 dropped today. Watch the other hand.

Comments
2 min read
What changed since the last scrape? A small change-detection layer (stdlib only)

What changed since the last scrape? A small change-detection layer (stdlib only)

Comments
3 min read
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