I'm Marcus Vinícius de Vasconcelos Filho, a full-stack software engineer with 10 years of experience in the JavaScript, TypeScript and Java ecosystems. I've worked for companies in Brazil, the USA, Portugal and Australia, and I'm currently building my own products with AI agents.
An iOS app for studying for the ENEM (Brazil's national university entrance exam) by listening. It turns ENEM questions into a narrated, swipeable audio feed, so students can study hands-free with the screen locked.
Solo developer, 2026. I designed and built the whole product myself: the hybrid mobile app, a custom native audio plugin in Swift, the marketing website and the email infrastructure.
A webapp that's a free tool for recording and downloading X Twitter Spaces. It uses the OpenAI Whisper and Qwen3.8 27B models for voice-to-text, summarization and metadata creation for the Rexpaces channel on YouTube.
Every video on the channel was generated by the tools I built.
A short-form video editor webapp (shorts, reels) for content creators who want an app that's fast, easy and flexible to use. No installation required.
I compiled all the dozens of UFO release PDFs declassified by the US government and extracted organized information using OCR techniques with Python. The site is a hobby; the goal is to present the information in an organized way for ufology researchers. I used AI prompting to summarize the documents and extract keywords.
I hold a degree in Systems Analysis and Development (ADS) from IFPB, and I recently passed a public examination at IFPB for a teaching position in Basic, Technical and Technological Education (EBTT). I didn't land one of the 8 openings, but I'm on the reserve list (18th place), and I'll possibly be called up in 2028 or later. To brag a little: I came in first on the objective exam! What sank me was the lack of academic career credentials — hence the 18th spot.
Until then, I want to make the most of my time in the market, especially building solutions with AI models, and with the development technologies and infrastructure I already have plenty of experience in: Node.js, Docker, Python, Angular, React, Cloudflare, AWS, MongoDB, PostgreSQL, etc, etc.
(Just to be clear, I'm open to new technologies — I'm an advanced Claude Code user and I pick up quickly any technology I don't know or haven't worked with yet.)
My GitHub accounts, with more technical projects: