docs: rewrite profile README with verified projects, stack and links
- 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)
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# Evandro Fonseca Junior
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**Backend Software Engineer | Node.js · NestJS · TypeScript · Python · PostgreSQL**
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I build reliable backend systems, APIs and integrations, with hands-on experience taking products from technical discovery and architecture through implementation, testing, deployment and production support.
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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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## About me
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I'm a backend developer with 5+ years of software experience and a long-standing background in hardware and infrastructure. That combination helps me investigate problems beyond application code and design for reliability from the start.
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## What I do
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In the projects under my technical responsibility, I have made architecture and implementation decisions end to end: understanding business goals, choosing trade-offs, modeling data, building APIs, automating tests and delivery, and following the system in production. I value simple solutions, clear communication and ownership without losing the humility to ask, validate and learn.
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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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I'm currently focused on **Backend Developer / Backend Software Engineer** opportunities where I can contribute with autonomy, responsibility and consistent delivery.
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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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## Production work
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Some recent professional systems are private, but their architecture and outcomes can be discussed publicly:
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- Owned the architecture and delivery of a web, mobile and IoT ecosystem using NestJS, Next.js, React Native/Expo, TypeScript, Python and PostgreSQL.
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- Designed a modular NestJS platform with **8+ isolated domains**, full OpenAPI documentation, S3-compatible storage, health checks and automated tests with reported coverage above **80% of lines and 70% of branches**.
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- Built a reusable offline-first TypeScript SDK with auth, sync, media and transaction modules, including **46+ integration tests**, retry/backoff, dead-letter handling and SHA-256 deduplication.
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- Implemented an e-commerce search engine with scoring across **7 dimensions**, ACID inventory transactions, isolated customer/admin authentication and a layered shipping fallback strategy.
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- Collaborated on Angular and Node.js legacy modernization, internal libraries and business-rule implementation at Innovo.
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## Core stack
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| Area | Technologies |
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| --- | --- |
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| Backend | Node.js, NestJS, TypeScript, Python, REST APIs, OpenAPI |
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| Data | PostgreSQL, SQL, Drizzle ORM, Prisma ORM, SQLite |
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| Cloud & infrastructure | Docker, AWS S3, Linux, Cloudflare, CI/CD |
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| Quality & security | Jest, Vitest, Playwright, OAuth2, RBAC, JWT, Zod |
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| Additional experience | Offline-first systems, IoT/Edge, observability, computer vision, React Native |
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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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### [PiAgentUI](https://github.com/evandrodevbr/PiAgentUI)
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### AI and agent tooling
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Desktop and web workspace for AI coding agents, with streaming sessions, MCP and skills panels, terminal, file explorer and a Tauri desktop application. Built with React 19, TypeScript, Vite and Tauri 2.
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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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### [Gemini Nexus](https://github.com/evandrodevbr/GeminiNexus)
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### Web apps and developer tools
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Multi-account desktop gateway for Gemini and Claude. Provides OpenAI- and Anthropic-compatible APIs, SSE streaming, account switching, traffic observability and encrypted credential storage.
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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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### [orelhIA](https://github.com/evandrodevbr/orelhIA)
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## Professional work
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Local and privacy-oriented PT-BR audio transcription server for MCP agents. Built with Python, Docker and Parakeet TDT, with caching, metrics, SSRF protection and automated tests.
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Part of my work lives in private repositories. The scope, without the code:
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### [NutriScan](https://github.com/evandrodevbr/nutriscan)
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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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Nutrition information platform using Next.js, TypeScript and Prisma. Integrates a collaborative dataset covering 2M+ products and 100+ countries, with advanced filters, layered caching and offline support.
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## Stack
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### [latebra](https://github.com/evandrodevbr/latebra)
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Self-hosted Python MCP server for private and resilient web access, search and extraction, with layered fallbacks, proxy support, observability and an extensive automated test suite.
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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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I'm open to backend engineering roles, technical collaborations and conversations about architecture, APIs and reliable systems.
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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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