Salvador, Brazil · teams in Brazil and Europe
I build and evolve web systems with Ruby on Rails and React. I combine hands-on development with architectural decisions, software quality and clear communication throughout delivery.
01 Evidence
At Oxeanbits since June 2017, responsible for the architecture, development, evolution and technical leadership of web systems.
Technical leadership for teams on projects for clients in Norway, the Netherlands, Germany and Brazil, including direct client contact.
On Digitalize, I designed the foundation and wrote most of the backend. Once the platform was in production, I became the team’s technical lead, guiding architecture decisions, code review and product evolution.
I independently developed parsec-web, the WebAssembly version of a C++ equation-evaluation library.
02 Selected work
Three cases with the problem, my part and the outcome. Most of this work was done in teams through Oxeanbits; each page states clearly what was mine.
C++ · WebAssembly · Compilers
Library development; individual WebAssembly version
Rails · MongoDB · GraphQL
Foundation design and technical lead
Rails 8 · React · TypeScript · ClickHouse
Leading full-stack contributor on a three-person team
Ruby libraries I authored or coauthored and a Rust tool. Each project shows a concrete problem, the implementation and my role.
Formula evaluation with a C++ core accessible from Ruby.
View code and documentation: parsecs Explore the work: parsecsDeep cloning of records and their relationships.
View code and documentation: deep-cloning Explore the work: deep-cloningInspection of ActiveRecord model hierarchies and associations.
View code and documentation: hierarchy-tree Explore the work: hierarchy-treeSelective validation control for operations with explicit exceptions.
View code and documentation: validations-skipper Explore the work: validations-skipperDeletion of items and their descendants in a hierarchy.
View code and documentation: cascade-deleter Explore the work: cascade-deleterGit worktree organization and environment preparation from the terminal.
View code and documentation: Wisetree Explore the work: Wisetree03 Skills
My deepest experience is in Rails, with React and TypeScript in production. Python, Shell, data, automation and Rust tooling broaden the problems I can solve. The cases and public code show that work.
From business rules to production investigation, I choose tools to fit the constraints of the system.
04 How I can help
Hands-on Senior Full Stack Developer and/or Tech Lead
For products that need someone to own features from the database to the interface, make architecture decisions and keep quality up while shipping.
Diagnosis and direction in areas I have worked in
For teams that need a technical second opinion, a plan to reduce technical debt or clear criteria for decisions on architecture, testing and AI use.
05 How I make decisions
Seniority shows in decisions: what to simplify, what to test, how to explain a trade-off. Each principle below links to a case.
I choose the simplest solution that supports how the product will evolve. Flexibility has a cost and has to be justified by real use.
Seen in Digitalize
Intention-revealing names and explicit flows reduce the cognitive load for whoever maintains the system after me.
Seen in React modernization
Tests protect business rules while things change. With BDD, they stay readable even for people who did not write the code.
Seen in DPMS
I would rather persuade with arguments than impose a choice. That is how a team adopted a shared repository for frontend and backend.
Seen in Context for AI
I use AI to move faster, with instructions, selected context and verification. Responsibility for the result stays with me.
Seen in AI harness
In AI-assisted development process: Context is King.
This is how I sum up the practice: in AI-assisted development, the quality of the outcome depends on the relevant context available. I do not claim to have coined "Context is King"; the phrase captures how I apply the idea.
Context for AI06 Shared knowledge
I gave two talks at the Federal University of Bahia (UFBA) representing Oxeanbits. They led to a Clean Code repository that now also shapes how I evaluate AI-generated code.
Original title A importância do Clean Code e BDD nos Testes Automáticos
Computing Week (SEMCOMP), UFBA · representing Oxeanbits
Why BDD matters in automated testing, with practical examples of tests that describe behavior.
Original title Como varrer seu código: Princípios do Clean Code
Computing Week (SEMCOMP), UFBA · representing Oxeanbits
Clean Code principles presented through code examples.
A tool built on madge to inspect React JSX component relationships. It helps understand dependencies before changing an interface.
A Python macOS port of a song converter, based on analysis of the original Windows program. An example of investigation and interoperability.
Principles, examples and signs of code that is hard to maintain. It grew out of the talks and applies to AI-generated code too.
Reusable AI agent skills for Claude Code, Codex CLI and OpenCode: staged planning, review, BDD testing and bug investigation.
A personal Python project that applies strategies described by well-known investors to the Brazilian stock market. A programming exercise, not financial advice.
07 Background and education
Computer Science at UFBA, a year of exchange studies in the United States and, since 2017, web systems for clients in Brazil and abroad.
I work in Portuguese and English with international teams and clients.
2011 to 2017
Bachelor's degree at the Federal University of Bahia. Final project on an interpretability index for fuzzy systems, graded with the maximum score.
Jun 2015 to May 2016
A year at the State University of New York at Plattsburgh, in the United States, through the Science without Borders program, with a CAPES scholarship.
Since Jun 2017
Working as a contractor in the role of Backend Tech Lead and Senior Full Stack Developer: DPMS, Digitalize, Status Survey and Parsec, with teams on projects for clients in Norway, the Netherlands, Germany and Brazil.
2021
SEMCOMP at UFBA, representing Oxeanbits.
2024
SEMCOMP at UFBA, representing Oxeanbits.
08 Contact
Hiring for your team or solving a product problem? Share the context and the outcome you need. We can discuss a Senior Full Stack Developer or Tech Lead role, project development or technical consulting.
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