fg v20.0 · fernando's sessionwriting/

Fernando Gomes, systems architect

Systems architect. 20 years building critical systems in payments, banking and healthcare.

Ask in plain English (or Portuguese) or type / for commands. Esc skips any animation.

who is fernando?

I'll go through his history and pull out what matters.

Read(career.md)
Read 7 chapters, 2005 → today
Read(photo.jpg)
Grep("regulated|critical", work/)
4 domains: payments · banking · healthcare · public infrastructure
Update(todos)
Read the history
Find the hard problems
Show the work
Start a conversation

Fernando is a systems architect. For 20 years he has built platforms where a wrong decision costs money, compliance or patient care.

He ties every architecture decision to a business consequence: availability, cost, regulatory risk, delivery speed.

Pick a row, run /log for the whole history, or /contact. You can also just ask.

Everything in this session

man fernando · the full output of every command

/work

Four cases. Pick one:

/work bank

work/banking.md+3 −1
1removed: monolithic systems, each team with its own rules
2added: a microservices practice: design patterns, security standards, governance
3added: core accounting & contract engine: R$10B+ in assets, zero-defect central-bank compliance
4added: real-time treasury calculations (MtM, accrual) for derivatives and corporate loans

Modernizing the core.

  • Led 30+ engineers across Brazil and India with async workflows that kept development running around the clock.
  • Before that: event-driven automation for financial markets (+30% operational efficiency) and an internet banking platform built from scratch, 15 major releases, all on deadline.

Next: /work ai · or /contact

/work health

work/healthcare.md+2 −1
1removed: every partner integration built by hand, weeks each
2added: one FHIR-based health data layer on AWS that partners plug into
3added: partner integration time cut by 50%: from weeks to days

A common language for clinical data.

  • Digital urgent care moved from legacy components to microservices: 15,000+ consultations a month at 99.99% availability.
  • FinOps run with engineering and finance leadership: monthly cloud cost down 20% while operations grew.
  • Cloud-native platform for a medical college that holds 3,000+ concurrent students during exam windows.

Next: /work bank · or /contact

/work ai

work/applied-ai.md+1 −1
1removed: accountability report assembled by hand: 2 days
2added: AI agents that read, check and assemble it: 30 minutes

From two days to thirty minutes.

  • Built with boundaries: a defined task, reliable inputs and a way to verify the result.
  • 10+ applied-AI training sessions so engineering teams use LLMs and coding agents day to day.
  • A technical due-diligence framework for the architecture, security and code quality of fintechs and healthtechs.

Next: /work scale · or /contact

/work scale

work/national-scale.md+2 −0
1added: technology roadmap and cloud architecture sized for billions of transactions a year
2added: architectural impact assessment for a nationwide tax reform

Planning for national scale.

  • The hard part is not the target architecture. It is getting there while the operation keeps running.

Next: /work health · or /contact

/log

  1. a3f9e21(HEAD -> main)2026payments at global scale
  2. 7c1d0b42024architecture and AI agents at public-sector scale
  3. 5e88a102021health data platform, urgent care, FinOps
  4. 2b4c7d92017treasury engine, microservices practice, core accounting
  5. 91fe3a22015event-driven automation for financial markets
  6. 44d0e7c2012internet banking, built from scratch
  7. 0c11e052005init: secure internet banking and mobile payments

Click a commit, or run git show 2b4c7d9.

git show a3f9e21 · 2026–today

commit a3f9e21 (HEAD -> main)
Author: Fernando Gomes <hi@fernandogomes.dev>
Date: 2026 → today
Role: Software Engineer
payments at global scale
  • Regulated, large-scale payments on a global engineering team, across time zones, in English.
  • Solution design and technical decomposition for changes that span several teams and services.
  • Java and Node.js services; currently on the frontend with Next.js, React and TypeScript.

← 2024 · /log

git show 7c1d0b4 · 2024–2026

commit 7c1d0b4
Author: Fernando Gomes <hi@fernandogomes.dev>
Date: 2024 → 2026
Role: Founding Engineer
architecture and AI agents at public-sector scale
  • Architecture and AI-agent POCs that cut an accountability reporting process from 2 days to 30 minutes.
  • Technology roadmap and cloud architecture sized for billions of transactions a year.
  • Architectural impact assessment for a nationwide tax reform.
  • 10+ applied-AI training sessions; a technical due-diligence framework for fintechs and healthtechs.

← 2021 2026 → · /log

git show 5e88a10 · 2021–2024

commit 5e88a10
Author: Fernando Gomes <hi@fernandogomes.dev>
Date: 2021 → 2024
Role: Engineering Lead
health data platform, urgent care, FinOps
  • FHIR health data layer on AWS: partner integration −50%, from weeks to days.
  • Digital urgent care on microservices: 15,000+ consultations a month at 99.99% availability.
  • FinOps: monthly cloud cost −20% while scaling.
  • Cloud-native platform for 3,000+ concurrent students during exams.

← 2017 2024 → · /log

git show 2b4c7d9 · 2017–2021

commit 2b4c7d9
Author: Fernando Gomes <hi@fernandogomes.dev>
Date: 2017 → 2021
Role: Software Engineer & Tech Lead
treasury engine, microservices practice, core accounting
  • Real-time calculation engine (MtM, accrual) for derivatives and corporate loans.
  • Founded the microservices practice: design patterns, security standards, governance.
  • Core accounting and contract engine: R$10B+ in assets, zero-defect central-bank compliance.
  • 30+ engineers across Brazil and India, development running around the clock.

← 2015 2021 → · /log

git show 91fe3a2 · 2015–2017

commit 91fe3a2
Author: Fernando Gomes <hi@fernandogomes.dev>
Date: 2015 → 2017
Role: Senior Backend Engineer
event-driven automation for financial markets
  • Event-driven workflow automation for financial markets: +30% operational efficiency.
  • Broker-based integration between distributed systems in a high-security banking environment.

← 2012 2017 → · /log

git show 44d0e7c · 2012–2015

commit 44d0e7c
Author: Fernando Gomes <hi@fernandogomes.dev>
Date: 2012 → 2015
Role: Senior Java Developer
internet banking, built from scratch
  • An internet banking platform built from scratch: 15 major releases, every one on deadline.
  • Regulatory compliance modules: complex financial rules translated into Java.

← 2005 2015 → · /log

git show 0c11e05 · 2005–2012

commit 0c11e05
Author: Fernando Gomes <hi@fernandogomes.dev>
Date: 2005 → 2012
Role: Software Engineer
init: secure internet banking and mobile payments
  • Secure internet banking and mobile payment gateways for global financial institutions.
  • Early mobile transaction security, from AppSec to data encryption.

2012 → · /log

/stack

stack/
languages/
TypeScript · Java · Python · SQL
backend/
Node.js · NestJS · Spring Boot · event-driven
frontend/
Next.js · React · Tailwind CSS
cloud/
AWS · Kubernetes · Docker · Terraform · FinOps
data/
PostgreSQL · Oracle · DynamoDB · Redis · FHIR
ai/
LLM agents · agentic workflows · Claude Code · Codex
6 directories, 25 files

/principles

# How he decides
  1. Start with the problem.Before choosing a technology, understand what needs to change and how to tell if it worked.
  2. Modernize with context.Existing systems carry years of business knowledge. Moving forward means understanding what to keep.
  3. Build AI with boundaries.Useful AI needs a defined task, reliable inputs and a way to verify the result.

/writing

  • -rw-r--r--2026-02-10beyond-the-chatbot.mdBeyond the Chatbot: Building Agentic Workflows for Real-World Due Diligence
  • -rw-r--r--2026-01-24from-java-to-node.mdFrom Monoliths to Microservices: What 15 Years of Java Taught Me About Node.js

All articles: cd writing/

/education

  • MBA in Technology for Business (AI, data science, big data) · expected 2026
  • B.Sc. Computer Science · 2000–2004

/faq

What does Fernando Gomes do?
He is a systems architect: architecture, hands-on engineering and technical leadership for critical systems, with every decision tied to a business consequence (availability, cost, regulatory risk, delivery speed).
Which industries has he worked in?
Payments, banking and healthcare for 20 years, plus public-sector platforms and applied AI since 2024.
What results has he delivered?
A core accounting platform for R$10B+ in assets with zero-defect central-bank compliance, partner integration time cut by 50% with a FHIR data layer, 99.99% availability for 15,000+ consultations a month, 20% lower monthly cloud cost, and a 2-day reporting process reduced to 30 minutes with AI agents.
Where is he based?
São Paulo, Brazil. He works with global engineering teams across time zones, in English.
How can I contact him?
By e-mail at hi@fernandogomes.dev or on LinkedIn (linkedin.com/in/fernandogomes83). The résumé PDF has the full employment history.

/resume

resume.pdf · the full history, with company names

/contact

/help

Everything this session understands:

/work [health|bank|ai|scale]
selected work, as diffs
/log
twenty years as a git log
/stack
tools and platforms
/principles
how he makes decisions
/writing
articles
/education
degrees
/faq
questions people ask
/resume
download the résumé (PDF)
/contact
get in touch
/portrait
render his photo as text
/replay
replay the intro
/clear
clear the screen
/help
everything this session can do
git log · git show
also work, as do ls, cat, tree, whoami

Not everything is listed here.

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ls

career.md education.md PRINCIPLES.md photo.jpg resume.pdf stack/ work/ writing/

git status

On branch main
Your branch is 20 years ahead of 'origin/junior'.
Untracked: your next project (use /contact to add it)
⎇ main~/fernandoSão Paulo/ commands · ↑↓ history · tab completes