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Articles
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Paygrama: a payment, drawn from the inside
Engineering · Projects · 7 min 0 0
Paygrama is a free lab that shows, message by message, what happens in a card payment, Pix, chargeback, MED, Open Finance and account opening. For people new to the field, for product, engineering and support teams, and for anyone who has ever wondered why a purchase was declined.
- November 2026
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Soccer Deal: a football manager where the AI talks and the rules decide
Engineering · AI · Projects · 15 min 0 0
From Elifoot and Brasfoot to Soccer Deal: how I built a football manager that runs in the browser, the tools, the game mechanics, the match decision engine and the AI behind the negotiations, with the architecture explained in C4.
- October 2026
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Turning sweat into gold: what I reread when I started leading leaders
People · 8 min 0 0
I reread Bernardinho's book when I took on leading technology managers: discipline as culture, intention over form and the ego of the collective.
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How I built a podcast with my cloned voice, from script to blog
Engineering · AI · Projects · 15 min 0 0
The full pipeline behind the fghisi podcast: notes, a script written with Claude, review in a pull request, a cloned voice on ElevenLabs, post-production in ffmpeg, GitHub releases, Eleventy and an RSS feed. With the tools, the commands, the costs and the mistakes that cost me credits.
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From senior to principal: the work that happens between teams
Career · Engineering · 17 min 0 0
What changes at each step of the technical career, from senior to staff, senior staff and principal, why the change is about behavior and not technique, and how it shows up in a payments team organized into a core line, a customer line and platforms.
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Team Topologies in practice: how we designed our payments team
People · Engineering · 13 min 0 0
Why I believe the shape of the teams defines the shape of the software, what Team Topologies proposes, and how we organized a payments team into a core line, a customer line and platforms.
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Leaders don't just respect the culture, they carry it
Career · People · 5 min 0 0
An end-of-quarter performance committee, a senior engineer without ambition, and what Bernardinho and Benchimol taught me about bringing out the best in people.
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XP in 2026: the practices changed shape, the values didn't
Engineering · AI · 6 min 0 0
What Extreme Programming still teaches in the age of LLMs: where AI sped up my team, where it stalled, and why fast feedback is still the game.
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Serasa Tech Summit Blumenau: helping others also means opening doors
Community · 3 min 0 0
How a day of talks, mentoring and conversations in Blumenau connects to the same wish that gave birth to amardoar.
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From code to management, and back to code: building amardoar with AI
Engineering · AI · Projects · 9 min 0 0
How an old idea of helping others became a website, and what I learned building it with an AI as a pair programmer.
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