iiinova — where your digital self keeps evolving

Gui Ferreira @guiferreira.me · 27/01/2026

System design for Agentic AI. A helpdesk triage agent that retrieves facts, calls tools, and knows when to hand off.

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Gui Ferreira @guiferreira.me · 20/01/2026

System design for Agentic AI. A helpdesk triage agent that retrieves facts, calls tools, and knows when to hand off.

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Gui Ferreira @guiferreira.me · 06/01/2026

System design for Agentic AI. A helpdesk triage agent that retrieves facts, calls tools, and knows when to hand off.

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Gui Ferreira @guiferreira.me · 31/12/2025

Happy New Year 🎉 Thank you for being here this year. I wrote a short reflection on 2025. Link below.

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Gui Ferreira @guiferreira.me · 24/12/2025

Wishing you a simple, calm Christmas. Thank you for being here this year.

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Gui Ferreira @guiferreira.me · 23/12/2025

Want Cursor to act less like chat and more like a teammate? Use a two-rule workflow: plan everything, then execute commit-by-commit. More control, better output.

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Gui Ferreira @guiferreira.me · 16/12/2025

🎥 If Your Integration Tests Feel Impossible to Debug, Watch This! Ever tried debugging an integration test, only to get nothing in your output window? No logs, no console messages, just confusion. That's exactly what xUnit v3 fixes with CaptureOutput. 👀 Watch the full video on YouTube 👇

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Gui Ferreira @guiferreira.me · 09/12/2025

🤖💥 Your code assistant might be seeing more than you want. Stop accidental leaks, learn the precautions you need today.

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Gui Ferreira @guiferreira.me · 02/12/2025

Want Cursor to act less like chat and more like a teammate? Use a two-rule workflow: plan everything, then execute commit-by-commit. More control, better output.

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Gui Ferreira @guiferreira.me · 26/11/2025

The solution: the <picture> element.

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Gui Ferreira @guiferreira.me · 25/11/2025

Build a Full-Stack AI App with .NET. A 7-week cohort designed to take you from curious to confident. Each week includes a focused video lesson + office hours for direct feedback. By the end, you'll know exactly how to add real AI features to your product. Ready to level up your .NET skills?

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Gui Ferreira @guiferreira.me · 25/11/2025

🤖💥 Your code assistant might be seeing more than you want. Stop accidental leaks, learn the precautions you need today.

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Gui Ferreira @guiferreira.me · 18/11/2025

You thought DRY meant deleting duplicate code? Think again. It's about keeping your knowledge in one place, not just your syntax. 🧠

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Gui Ferreira @guiferreira.me · 11/11/2025

Ever spent ages on a "5-minute fix"? 😅 This video breaks down why simple problems often need smarter thinking, not more code. 💡 Simple Problem ≠ Simple Solution - learn when to stop, rethink, and start again.

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Gui Ferreira @guiferreira.me · 10/11/2025

When I noticed performance problems on my site, my initial thought as a backend developer was: "Maybe I need a CDN. Maybe new caching rules. Maybe infrastructure changes." But the real fix? Just 3 lines of HTML.

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Gui Ferreira @guiferreira.me · 04/11/2025

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Gui Ferreira @guiferreira.me · 15/09/2025

New to testing in C#? Start here 👇 xunit.net course → from your first test to pro practices. 🔗 dometrain.com/course/from-...

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Gui Ferreira @guiferreira.me · 05/06/2025

Watched a senior dev spend 3 days testing code that took 2 hours to write. Why? He wrote it backwards. Most C# devs do. I did too—until I learned to write code that wants to be tested. I packed 15 years of lessons into a 4h course. 👇 Link in replies

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Gui Ferreira @guiferreira.me · 30/04/2025

Do you know if there is any data on the age distribution of .NET developers (like the one in the image)? I'm trying to confirm a theory 😉

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Gui Ferreira @guiferreira.me · 11/04/2025

I'm writing this week's newsletter, and I noticed I've changed my belief system. "Do it just because it's cool"

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Gui Ferreira @guiferreira.me · 09/04/2025

"It's just perfect for immediate use!" That's what our students say about our OpenTelemetry in .NET course. Stop wondering how to implement modern observability - start building it today with 40% OFF!

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Gui Ferreira @guiferreira.me · 07/01/2025

5 minutes and 15 seconds a year is how long your cloud applications can be down, even if you go the extra mile. Even the hard-to-get famous five nines (99.999%) feel perfect until we know what they mean. There's no perfection. There's a ton of tradeoffs.

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Gui Ferreira @guiferreira.me · 23/12/2024

"Difficulties are just things to overcome, after all." Sir Ernest Shackleton This book is a brilliant story of authentic leadership.

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Gui Ferreira @guiferreira.me · 21/12/2024

I do not feel excited about this. Vigo, Spain

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Gui Ferreira @guiferreira.me · 20/12/2024

This goes directly into the highlights of 2024. "Keep Coding" is not only Nick Chapsas synonym but also part of the collective history of hashtag#dotnet. If you recognise it, it means that at some point, you relied on Nick to keep up with .NET. We have that in common.

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Gui Ferreira @guiferreira.me · 19/12/2024

I'm not sure how I feel about these numbers... 2023 vs 2024 on YouTube.

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Gui Ferreira @guiferreira.me · 11/12/2024

I always have a yearly goal for what I want to learn. A skill, a language, a framework, etc. What do you plan to learn next year? What's on your list for 2025?

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Gui Ferreira @guiferreira.me · 05/12/2024

YouTube is such a great place for self-esteem 🙃

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