~/gelonezi $ whoami
Senior / Staff Software Engineer Software Architect
I design and scale distributed systems in C#/.NET on AWS, and I run AI-assisted engineering where agents draft and a senior engineer decides.
Open to Staff & Architect roles · Remote · Full-time or B2B contract
25+
microservices · 200k req/day
Replaced a legacy monolith one operation at a time, with zero-incident cutovers.
−40%
AWS resource reservations
AI-driven analysis tuning Kubernetes autoscaling. API throttling eliminated.
2 mo → 20 h
postgrad phase, AI-assisted
A two-month project phase delivered in ~20 hours with AI agents. I reviewed every change.
2001
coding since · 5 mentored
Tech lead from early on. Mentored engineers from intern to senior.
Now building MyMechanicShop: a modular monolith on .NET 10 + ABP, one DDD module and database per business area. live ↗ code ↗
00 / Intro
An unscripted intro, in English: where I come from, the system I'm proudest of, and how I lead.
Chapters
“I've always been a tech lead, even at the beginning of my career. It's something I carry with a lot of pride.”
Hi, my name is Roger. I'm a senior software engineer, and I started my career in 2001. So yes, I have a lot of experience behind me: I've worked with many kinds of companies and industries, and built software for many kinds of architectures and server environments. I'll focus on my latest projects, or this would be a half-hour video.
I can talk a little about a set of microservices: 25 microservices in a fully scalable architecture, built to replace legacy systems. Each microservice replaced, one by one, an operation of the legacy monolith. It was a fully agile environment, so we could validate step by step, in real time, and every step taught us something about reading and writing documentation.
I was the main person responsible for understanding the legacy system and designing the documentation and the architecture of the new system: how one would replace the other. I was the point of contact working remotely inside the client. I followed up on every situation personally, and we had a really good set of metrics and observability, so we could prove the replacement was a full success, 100% okay, and release the new software.
I was also the main person responsible for onboarding and mentoring, from interns and junior developers to senior developers: setting up how the team works and how to collaborate with it. I've always been a tech lead, even at the beginning of my career. It's something I carry with a lot of pride, and I've received many compliments and thanks for it.
Hope we can talk again. Thank you so much.
01 / Featured system
The integration platform I architected at Softplan: one API contract over ~20 heterogeneous court and prosecutor systems, built as ~25 .NET microservices that replaced the legacy platform over four years without a single incident at cutover.
Component
Consumers integrate once. Behind that single contract, stateless connectors absorb the constant change in external court systems, and each one ships, scales and fails independently.
Generalized reference: product names and client specifics removed. Full board on Excalidraw ↗ Source ↗
02 / Experience
Most recent first. The numbers are from production, not slides.
03 / How I work
Claude Code, Copilot, Cursor and MCP-connected sub-agents, used inside guardrails: specs first, small diffs, and every change reviewed before merge. That's how a two-month postgrad phase took about 20 hours.
RFCs and ADRs turn hallway decisions into durable context. New engineers learn why, not just what, and architecture stops depending on who was in the room.
Metrics, traces and alerts ship with the feature. That's what turned zero-incident cutovers into a measurement instead of a hope.
Mentoring from intern to senior, onboarding that sticks, and knowledge transfer deep enough that a client's own team can take over the codebase.
04 / Projects
Open-source work you can read, plus professional products I can describe but not show.
Now building · Open source
A realistic practice ground for a mechanic-shop product: a modular monolith where every business area is its own ABP module with its own database.
FIAP postgrad · Open source
A workshop-management system that evolved across the postgrad's Tech Challenge phases: from monolith to Clean Architecture + DDD + CQRS, then onto AWS.
2 months → ~20 hours. One full phase delivered with AI agents, every change human-reviewed.
Professional · Softplan · 2026
A chatbot over lawsuit documents: agents answer questions, summarize case files and draft new legal documents, with a human approving key decisions.
Proprietary: no public code
Professional · Softplan · 2026
A production ML classifier that routes cases at a public prosecutor's office, replacing manual triage.
~40% → 80%+ accuracy, scaled from 12 to 140+ labels.
Proprietary: no public code
Professional · Eris Sistemas · 2021
A React Native self-checkout with PagSeguro payments for a major São Paulo bookstore. PagSeguro later cited it as a benchmark: their first self-checkout built in React Native.
Proprietary: no public code
Open source · .NET
A lightweight API for publishing messages to RabbitMQ, built for learning and load testing, with pooled connections and cached objects for throughput.
05 / Stack
What I reach for, grouped the way I think about systems. Highlighted = daily drivers.
06 / Writing
Short posts on engineering careers, AI-assisted development and remote work.
In 2020 a Staff Engineer job description looked like a hiring plan for a whole team. Today I read the same lists and think: done that, worked with that, and I can bring more.
A bad dream about commutes and constant interruptions, and what it taught me about focus, my own space and time with family. Quality of life is the raise I won't trade back.
Implementing Saga with MassTransit in C# for about $30 in tokens. My rule: make the AI report what it did and why, like a teacher, so you learn the architecture and not just the prompts.
Why I switched AI coding tools after a year, and the night I sketched a feature at the gym and came home to find it built.
07 / Education
Postgraduate · Lato Sensu · 360 h
FIAP · São Paulo · Aug 2025 — Jul 2026
Modules · highlighted = top mark (96)
B.Sc. Information Technology
UNIVESP · São Paulo State Virtual University · 2022 — 2025
Bachelor's, Business Administration
ITE · Instituição Toledo de Ensino · 2006 — 2008
Technical Diploma, Software Programming
Colégio Técnico Industrial “Prof. Isaac Portal Roldán” · 2001 — 2003
Languages
08 / Contact
I'm open to Staff Engineer and Software Architect roles, remote, as a full-time employee or B2B contractor. LinkedIn is the fastest way to reach me; my contact details are open to recruiters there.