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<div align="center">
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<img src="assets/readme/hero.svg" width="100%" alt="Evandro Fonseca Junior, backend engineer: APIs and integrations for IoT devices, web and mobile apps, in TypeScript, Python, NestJS and PostgreSQL. Code self-hosted at git.evandro.dev.br.">
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<p>
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<a href="https://evandro.dev.br/?utm_source=profile-readme">Portfolio</a> ·
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<a href="https://git.evandro.dev.br/evandro">Gitea</a> ·
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<a href="mailto:evandrofonsecajunior@gmail.com">Email</a>
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</p>
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</div>
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# Evandro Fonseca Junior
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Software engineer at Apolo Energia since 2022: APIs, IoT integrations and web and mobile apps, in TypeScript and Python.
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**Software engineer building custom systems, apps and integrations.** Backend-focused with Node.js, NestJS, TypeScript, Python and PostgreSQL, and hands-on work with AI agents and MCP tooling.
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Garuva, Santa Catarina, Brazil (UTC-3), working remotely. Open to backend roles and technical collaborations as of October 2026.
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[Portfolio](https://evandro.dev.br) · [LinkedIn](https://www.linkedin.com/in/evandrodevbr/) · [Email](mailto:evandro[email protected]) · [WhatsApp](https://wa.me/5547992742365)
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> [!NOTE]
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> My GitHub account, [edevbr](https://github.com/edevbr), is only an entry point: it is where people can find me and how I contribute to projects I believe in. My own work runs locally and on my self-hosted Gitea at [git.evandro.dev.br](https://git.evandro.dev.br/evandro), since GitHub suspended my previous account. [What happened](#what-happened-to-my-previous-account).
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## Work you can check
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## What I do
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Live client projects, each with a public case study on my portfolio.
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I build software end to end: understanding the problem, choosing the trade-offs, modeling the data, writing the APIs and the interfaces, testing, deploying and following it in production.
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- **[SEV Moda Íntima](https://evandro.dev.br/cases/sev-modaintima)**: catalog, online store and an operations panel for products, orders and stock by size. Live at [sevmodaintima.com.br](https://sevmodaintima.com.br).
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- **[Lavação 047](https://evandro.dev.br/cases/lavacao-047)**: site and admin panel for a car wash. Customers pick a service and the order arrives on WhatsApp; the owner edits prices, text and photos without asking anyone.
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- **[Julia Beauty](https://evandro.dev.br/cases/julia-beauty)**: static site for a lash studio in Camboriú, with an eye-effect simulator, local SEO with JSON-LD and WhatsApp booking. Live at [juliabeauty.com.br](https://juliabeauty.com.br).
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- **[AS Serviços](https://evandro.dev.br/cases/as-servicos)**: institutional site for an engineering company, with a procedural Three.js scene that follows the page scroll (Next.js 16, React 19).
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- **[SC Plus Aquicultura](https://evandro.dev.br/cases/sc-plus)**: institutional site with service areas, projects and contact for an aquaculture company.
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- **Custom systems and apps**: web applications, mobile apps and internal tools, from discovery to production.
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- **Integrations**: REST APIs, third-party services and IoT devices talking to the rest of the stack.
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- **Backend engineering**: API design, data modeling, authentication and authorization, automated tests, CI/CD.
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- **AI and agents**: MCP servers and agent tooling, mostly local-first and self-hosted.
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- **Diagnostics**: performance, security and maintainability reviews of existing systems.
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## At Apolo Energia and before
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Five years of software work, with a longer background in hardware and infrastructure, which helps when a problem leaves the application layer. Based in Garuva, Santa Catarina, Brazil (UTC-3), working remotely. Open to backend engineering roles and to technical collaborations.
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This work lives in private repositories, so here is the scope without the code.
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## Selected projects
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- Web and mobile apps, APIs and IoT device integrations for Apolo Energia's internal routines and renewable energy operations, including operations dashboards.
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- A NestJS platform (TypeScript, PostgreSQL, Drizzle ORM) split into isolated domains, with OpenAPI docs, S3-compatible storage, health checks and test coverage thresholds of 80% of lines and 70% of branches.
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- An offline-first TypeScript SDK with auth, sync and media modules, retry with backoff, dead-letter handling and SHA-256 deduplication.
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- At Innovo, from December 2024 to February 2025: Angular components and Node.js back-end logic over PostgreSQL and MySQL, plus maintenance of legacy systems.
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### AI and agent tooling
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## Tools I build for myself
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- **[PiAgentUI](https://github.com/evandrodevbr/PiAgentUI)**: desktop and web workspace for AI coding agents, with streaming sessions, MCP and skills panels, terminal and file explorer (React 19, TypeScript, Vite, Tauri 2, GPL-3.0).
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- **[GeminiNexus](https://github.com/evandrodevbr/GeminiNexus)**: multi-account gateway for Gemini and Claude that exposes OpenAI- and Anthropic-compatible endpoints, with SSE streaming, usage analytics and credentials kept in the OS keychain (Electron, React 19).
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- **[orelhIA](https://github.com/evandrodevbr/orelhIA)**: local PT-BR audio transcription MCP server on Parakeet TDT, with LRU cache, VAD, metrics, SSRF protection and automated tests (Python, Docker, MIT).
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- **[latebra](https://github.com/evandrodevbr/latebra)**: self-hosted MCP server for private web access, search and extraction, with a three-layer anti-bot evasion pipeline, TLS impersonation, proxy rotation and a pytest suite covering the pipeline, proxy manager and stealth layers (Python, MIT).
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- **[dev-workflows](https://github.com/evandrodevbr/dev-workflows)**: code review workflows shipped as agent skills, covering frontend, backend, architecture and security with explicit verification steps (MIT).
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- **[oh-my-pi-telegram](https://github.com/evandrodevbr/oh-my-pi-telegram)**: Telegram adapter for the Oh My Pi coding agent, so a live terminal session can be driven from a private chat (TypeScript, Node 22).
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- **[LocalMind](https://github.com/evandrodevbr/LocalMind)**: mobile chat client for models served by LM Studio on the local network, with no cloud and no API key (React Native, Expo).
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These are private and not published as open-source packages. I can walk you through any of them on a call.
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### Web apps and developer tools
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- **orelhIA**: MCP server for local PT-BR audio transcription on Parakeet TDT, with an LRU cache, voice activity detection and SSRF protection.
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- **latebra**: self-hosted MCP server for private web search and extraction, with TLS impersonation and proxy rotation.
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- **PiAgentUI**: desktop and web workspace for AI coding agents, built with Tauri 2 and React 19.
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- **gemini-nexus**: multi-account gateway that exposes OpenAI- and Anthropic-compatible endpoints for Gemini and Claude.
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- **bthaven**: native Windows 11 Bluetooth device and audio hub in C#.
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- **[nutriscan](https://github.com/evandrodevbr/nutriscan)**: nutrition platform over Open Food Facts (2M+ products), with barcode search, Nutri-Score and NOVA filters, multi-layer cache and offline support (Next.js, TypeScript, Prisma). [Live demo](https://nutriscan.evandro.dev.br)
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- **[as-servicos](https://github.com/evandrodevbr/as-servicos)**: institutional site for an engineering company, with a procedural Three.js scene that follows the page scroll (Next.js 16, React 19, TypeScript).
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- **[Downloader](https://github.com/evandrodevbr/Downloader)**: ephemeral download proxy that fetches files on a VPS into short-lived sessions and serves them to the browser, with SSRF protection (Fastify, React).
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- **[cursorAI_install.sh](https://github.com/evandrodevbr/cursorAI_install.sh)**: Bash script that installs, repairs and removes the Cursor IDE on Linux, choosing AppImage, DEB or RPM from the detected distribution and architecture (MIT).
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- **[bthaven](https://github.com/evandrodevbr/bthaven)**: native Windows 11 Bluetooth device and audio hub in C#, developed probe-first, so features land only after the underlying Windows behavior is demonstrated with code (MIT).
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## Professional work
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Part of my work lives in private repositories. The scope, without the code:
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- Backend and integrations for the web and mobile applications that support Apolo Energia's internal routines, including IoT device integration and operations dashboards for renewable energy processes.
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- A modular NestJS platform (TypeScript, PostgreSQL, Drizzle ORM) split into 8+ isolated domains, with OpenAPI documentation, S3-compatible storage, health checks and automated tests with coverage thresholds of 80% of lines and 70% of branches.
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- An offline-first TypeScript SDK with auth, sync, media and transaction modules, including retry with backoff, dead-letter handling and SHA-256 deduplication.
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- E-commerce systems with ACID inventory transactions, separate customer and admin authentication and relevance-ranked product search.
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- At Innovo (December 2024 to February 2025): Angular front-end components and Node.js back-end logic over PostgreSQL and MySQL, internal libraries and maintenance of legacy systems.
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## Stack
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| Area | Technologies |
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| --- | --- |
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| Languages | TypeScript, JavaScript, Python, SQL, Bash, C# |
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| Backend | Node.js, NestJS, Fastify, Express, PHP, Laravel, REST, OpenAPI |
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| Backend | Node.js, NestJS, Fastify, Express, REST APIs, OpenAPI, PHP, Laravel |
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| Frontend and mobile | React, Next.js, Astro, React Native, Expo, Tailwind CSS |
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| Data | PostgreSQL, MySQL, SQLite, MongoDB, Prisma, Drizzle ORM |
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| Infrastructure | Docker, Linux, S3-compatible storage, CI/CD, Firebase, self-hosted Gitea |
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| Infrastructure | Docker, Linux, S3-compatible storage, CI/CD, Firebase |
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| Quality and security | Jest, Vitest, pytest, Playwright, OAuth2, JWT, RBAC, Zod |
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## What happened to my previous account
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My previous GitHub account, evandrodevbr, was suspended after one of my repositories was flagged. That repository was my mistake, made without bad intent, and I offered to delete it right away so it could not affect anyone.
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The offer changed nothing. There was no way to remove that one repository and keep the account, and the suspension made no distinction between it and years of unrelated work. I lost my personal repositories and the ones I maintained for companies I worked for, along with their issues, reviews and history.
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I had backups, so the code survived. Since then my development setup runs on my own machines and my own server, where a decision I have no say in cannot take years of work offline.
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## Contact
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**Best way to reach me: [[email protected]](mailto:[email protected]).** I answer in Portuguese or English.
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Elsewhere: [WhatsApp](https://wa.me/5547992742365) · [portfolio](https://evandro.dev.br/?utm_source=profile-readme) · [LinkedIn](https://www.linkedin.com/in/evandrodevbr/) · [Gitea](https://git.evandro.dev.br/evandro)
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If you maintain a project you think I should contribute to, send me the link.
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Open to backend engineering roles, technical collaborations and conversations about architecture, APIs and reliable systems. The fastest way to reach me is [email](mailto:[email protected]) or [LinkedIn](https://www.linkedin.com/in/evandrodevbr/).
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<div align="center">
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<sub>Made by <a href="https://evandro.dev.br">Evandro Fonseca Junior</a> · <a href="https://git.evandro.dev.br/evandro">git.evandro.dev.br</a></sub>
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<img src="https://github-profile-summary-cards.vercel.app/api/cards/profile-details?username=evandrodevbr&theme=transparent" alt="Evandro's GitHub activity overview" />
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</div>
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<!-- Owner: Evandro. Review this page when the role changes, a project goes public, a job search starts or the portfolio changes. Last reviewed: 2026-10-24. -->
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@@ -1,52 +0,0 @@
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<title id="title">Evandro Fonseca Junior</title>
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<desc id="desc">Backend engineer who builds APIs and the integrations that connect IoT devices, web apps and mobile apps to a PostgreSQL database. His code is hosted on his own Gitea server at git.evandro.dev.br.</desc>
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Before Width: | Height: | Size: 2.9 KiB |
Reference in new issue
Block a user