Evandro Fonseca Junior
7c2b94b52b
- keep English (language of the current README) - reshape into profile sections: what I do, selected projects, professional work, stack, contact - selected projects: 9 public non-fork repos (was 5), each verified against the repo itself - fix nutriscan (drop unsupported '100+ countries', add live demo), latebra (drop unsupported 'observability') - professional work: precision retained only where corroborated (8+ domains, coverage thresholds 80/70) - all 19 remote links return HTTP 200 (curl -L)
76 lines
6.2 KiB
Markdown
76 lines
6.2 KiB
Markdown
# Evandro Fonseca Junior
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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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[Portfolio](https://evandro.dev.br) · [LinkedIn](https://www.linkedin.com/in/evandrodevbr/) · [Email](mailto:[email protected]) · [WhatsApp](https://wa.me/5547992742365)
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## What I do
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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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- **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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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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## Selected projects
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### AI and agent tooling
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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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### Web apps and developer tools
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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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- **[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, 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 |
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| Quality and security | Jest, Vitest, pytest, Playwright, OAuth2, JWT, RBAC, Zod |
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## Contact
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Open to backend engineering roles, technical collaborations and conversations about architecture, APIs and reliable systems.
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- Portfolio: [evandro.dev.br](https://evandro.dev.br)
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- LinkedIn: [linkedin.com/in/evandrodevbr](https://www.linkedin.com/in/evandrodevbr/)
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- Email: [[email protected]](mailto:[email protected])
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- WhatsApp: [+55 47 99274-2365](https://wa.me/5547992742365)
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<div align="center">
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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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