PORTFOLIO / 2026
Full stack software engineer
I build web products end to end, from interfaces and APIs to integrations, infrastructure, and AI features. At GitStart, I work on products for different clients.
Education & credentials
On-demand engineering for external clients, internal projects, and open source contributions. Experience across different codebases and stacks such as React, Node.js, and GraphQL.
Client web development projects, including Talentz, the spycode-io job platform, and the Dinâmicas Terapêuticas app.
Products built outside GitStart with teammates for the Brazilian market: MoneyFy and Licify. The work spans data modeling, external integrations, user experience, and implementation.
Projects built solo from idea through end-to-end execution. Calamo and Floggy span data modeling and SDK work through production infrastructure, queues, billing, and self-managed deployment.
Click a card to flip it and see the technical challenge behind it.
Test automation engineering work in the Chromium ecosystem, focused on supporting and evolving WebDriver/ChromeDriver for Android and the platform's shared code components.
Challenge: Contributing in low-level languages and complex ecosystems (C++ and Java) with no prior experience in them, using AI as a learning lever to navigate the codebase, write code aligned with the project's rigorous standards, and review teammates' PRs.
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Built MoneyFy from scratch, a personal finance app with WhatsApp as the interface: backend architecture, data modeling, and the AI agent that interprets user messages.
An agent pipeline decides the action from the user's message — text, audio, or a receipt. Hotmart and Mercado Pago as payment integrations, handling onboarding and subscriptions.
Challenge: Keeping the agent accurate on a small, cheap model (GPT-5 nano) instead of a larger one, tuning reasoning per call type to control cost without losing reliability.
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Contributed to a B2G SaaS for Brazilian public-procurement intelligence (still under development), centralizing PNCP data for suppliers bidding on government contracts.
A custom ETL ingests and normalizes data from PNCP (Brazil's National Public Procurement Portal) into a dedicated data warehouse; documents live in Cloudflare R2, uploaded and read through signed URLs that never touch the backend.
Challenge: Joined after the platform was already founded, focused on improving performance and the product's overall experience — optimizing existing flows without breaking what was already working.
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Solo build of Calamo, a no-code backend builder: define objects and actions visually and publish each one as a REST route or an MCP tool, ready for an AI agent to call directly, no server code required.
NestJS and Next.js monorepo, with Postgres via Prisma/Knex for user-defined data, Mongo for execution logs, a Redis/BullMQ queue, Stripe billing, and a built-in AI chat (OpenAI Agents SDK) that helps build objects and actions in natural language.
Challenge: Designing a single action engine that automatically generates both REST routes and MCP tools from the same definition, including safe dynamic DDL on Postgres for every object the user creates or changes, without duplicating logic between the two exposure formats.
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Self-hosted feature-flags platform with a dashboard, API, and TypeScript SDK. Applications evaluate flags locally, without calling the server for every decision.
Monorepo with NestJS, React, and Redis. The SDK keeps an in-memory cache and synchronizes flags in the background.
Challenge: Evaluating boolean, percentage, and group-targeted flags on the client while keeping cache consistency and latency low.
← BackRebuilt a vibe-coded app for its owner, adding a protected members area and a checkout integrated with Appmax.
The prototype exposed paid content. While investigating sales, I found that the old webhook had not recorded buyers in the database; I rebuilt access control and payment confirmation.
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Backend refactoring and architectural migration, moving business logic out of the modules of an Express.js monorepo into an object-oriented microservices architecture built with NestJS.
Challenge: Mapping the coupled dependencies between the monorepo's modules and transposing the business rules into isolated NestJS microservices, while preserving each module's original behavior.
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Built Revi Pulse from scratch, a Website Builder platform for partner restaurants that lets each business create, customize, and publish its own site with the Revi menu and ordering platform natively integrated.
The architecture is a single Next.js application that dynamically renders hundreds of distinct sites based on the request host, using the Cloudflare API for custom domains and wildcard subdomains.
Challenge: Building a dynamic, high-performance multi-tenant architecture from scratch, able to render and route multiple sites and custom domains from a single deploy instance, with automated SSL/DNS provisioning via Cloudflare.
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Integration and support for the custom OutSystems Expression language inside the Monaco Editor within the company dashboard.
The delivery included custom syntax themes, language parsing, and autocomplete/IntelliSense logic.
Challenge: Integrating OutSystems' proprietary syntax into the Monaco Editor, adapting the language's parsing and real-time dynamic code suggestions without hurting the editor's in-browser performance.
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Worked on Project Cosmos, building a robust unit and integration test suite for the client's internal UI component library.
The suite ensures full coverage for design-system components — both functional behavior and strict accessibility (a11y) conformance.
Challenge: Guaranteeing the integrity, resilience, and accessibility conformance of the company's global components before downstream consumption, by simulating complex interface interactions.
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Migrated and modernized the company's Design System, replacing legacy inline-CSS styling with a modularized CSS Modules architecture.
The migration included new features, behaviors, and visual adjustments on the components, with regression validated via Storybook and Chromatic, in a local npm-link workflow between the library and the main application.
Challenge: Progressively migrating the component library with zero visual or behavioral regression on the main dashboard — validated with automated visual tests in Chromatic — while establishing a safe local-linking workflow between the two repositories.
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Legacy modernization and new analytics integrations for the product.
Progressive migration of old PUG (Jade) pages to modern React components, plus campaign/marketing parameter (UTM) capture and tracking integrated with the LinkedIn Ads platform.
Challenge: Refactoring the legacy PUG view layer to React while keeping visual consistency, alongside shipping reliable UTM capture for B2B campaigns.
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Targeted UI development and adjustments for new platform pages, covering both the web application and the hybrid mobile app.
Challenge: Keeping design fidelity and cross-platform visual consistency between the Web and Mobile versions.
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Continuous UI/UX and usability improvements on the platform's core text editor, plus a mid-size refactor of the styling and display system for in-app action notifications.
Challenge: Refactoring the notification styling system without introducing visual breaks or regressions in the editor writing experience.
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Implemented the portal's full rebranding process.
The delivery required building a reusable Vue component library from scratch, covering every visual variant, state, and behavior needed for the brand relaunch.
Challenge: Structuring a flexible Vue component architecture to support the full site rebrand while keeping consistency and code reuse.
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A platform for organizing collaborative notes on documents and websites with a team.
The work included migrating the web app from JavaScript to TypeScript and transitioning legacy Ruby microservices to Node.js, plus other general improvements across the platform.
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Started as an open-source contribution that, thanks to the quality and impact of the team's results, turned into a formal direct client contract.
The work covered visual refactors and general UI/UX improvements across the platform, plus e2e test coverage.
Challenge: Adapting and improving the UI in a large-scale, high-visibility open-source repository, while holding rigorous code standards and compatibility with the Next.js architecture.
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Started as an open-source contribution that evolved into direct client work.
The scope ranged from UI refactors and bug fixes to custom ESLint rules for team-wide code standards, plus critical features like complex composite inputs that required database migrations.
Challenge: Building complex, full-stack features — from database migrations to frontend state management with Recoil — in a modular open-source CRM platform.
← BackContinuous UI/UX polish directly on the application's interactive email editor, focused on usability, visual fluidity, and precision of the graphic elements.
Challenge: Raising the editor's visual refinement and usability while keeping precise, predictable rendering of the generated emails.
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Frontend development focused on implementing and updating the brand's official website interface, ensuring strict technical fidelity to the Figma prototypes and design system.
Challenge: Translating complex, responsive Figma prototypes into reusable, fluid, and performant components in the Vue ecosystem.
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My part of a broader website-modernization project for Hash.ai: building the dedicated technical documentation area, using MDX (MDXJS).
The implementation allowed interactive, styled React components to be embedded directly inside Markdown files, letting the content team write dynamic, visually rich documentation.
Challenge: Creating a styled component ecosystem fully integrated with the MDX parser, keeping Markdown's writing flexibility combined with React's interactive power.
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Open source contributions through GitStart, with targeted fixes to the Directus admin interface.
Small behavior and usability improvements to UI components.
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Continuous evolution and new features/integrations for the TrySavvy no-code platform, built for Growth and Engineering teams to create and test dynamic experiences (landing pages, quizzes, slide-style onboarding flows).
The app engine used an Express server reading JSON structures and dynamically serving HTML, with frontend interactivity orchestrated via Stimulus.js, and quality assured by a full Cypress e2e test suite.
Challenge: Expanding the existing ecosystem with new features and external integrations (Airtable) without compromising the stability of the Express/Stimulus.js Server-Driven UI architecture.
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Open source contributions through GitStart, fixing panels and dashboards and updating frontend tests.
The PRs covered charts, tables, tooltips, and notifications, plus fixes in Loki and Tempo.
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Open source contributions through GitStart to visualizations, filters, and query editor flows.
The PRs fixed bar charts, pivot tables, date filters, and focus after rerunning SQL queries.
← BackMy first project as a developer: freelance frontend work on Talentz, a technology job-listing platform by spycode-io, built with React, GraphQL, and Fastify.
Challenge: Breaking into the field with zero prior professional experience, learning on the job. It was a freelance project that never moved past this early stage — it never actually launched.
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