Marina Rosa
AI engineer in Rio de Janeiro, working where AI meets security.
About
I am Marina, from Rio de Janeiro, and I build with AI in cybersecurity. The work is a lot like learning an instrument: you play the wrong notes on purpose until the machine shows you how it is wired inside.
I have 13 years of professional experience in software, the last 4 of them full time as an AI Engineer across several startups. I started in small worlds: RPG Maker maps, Ruby scripts, Linux on a stubborn laptop, game servers I kept running for friends. That grew into production work, including cryptocurrency wallets, payment infrastructure, reliability, APIs, interfaces, and teaching, much of it shipped in the open.
In 2022 I fell for early image models the way people fall for polaroids: fast, a little strange, hard to put down. With a generative AI startup I even wore two model made images as tattoos, a small public proof that machine output and a human body can meet with intention.
Since 2023 I have worked hands on with LLMs and agentic engineering: retrieval pipelines, small agents, and the gateways and guardrails that keep their answers honest, especially where security is involved.
Contributions
Open source projects I have shipped merged pull requests to. Each project links to the full list of my diffs there.
AI
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gsh (generative shell)
An AI powered terminal. I added the entrap mode and execute support, integrated the GPT token encoder, and enforced a rolling token limit on the transcript so sessions stay within budget.
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Weaviate Verba
Weaviate's open source retrieval augmented generation app. I fixed the release workflow to resolve the branch name dynamically instead of assuming a fixed default.
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Devon
An open source AI software engineer. I added multi model configuration and Groq support for Llama 3 70B.
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mailogy
A natural language tool for your inbox. I added local models through Ollama and OpenAI compatible endpoints, LiteLLM support with cost logging, and a config file.
Blockchain
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PayButton
Open source cryptocurrency payment infrastructure. I did the bulk of the backend: the addresses, transactions, and balance APIs, the Prisma database layer and migrations, SuperTokens authentication, and most of the CI, from lint and test workflows to container image builds. Also early frontend structure and components.
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Bitcoin.com (mint)
The Bitcoin.com token minting wallet. I built the dividends page, the Satoshi Dice feature, multi address token burns, the faucet and token icon flow, and shipped a long run of send, transfer, and onboarding UX fixes through several production releases.
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CashScript
A high level smart contract language. I added browser support to the toolchain so contracts can be compiled and run client side.
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eCash (XEC) / Bitcoin ABC
Wallet and node work on the eCash codebase, contributed through the project's Phabricator review system rather than GitHub.
Side projects
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ressoar
A private practice room for your speaking voice, like a mirror that listens back and helps you train a voice that feels more like yours.
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command-and-combobulate
A quiet map room for steering several AI agents at once. Think the overview map from a strategy game, but for real agents: see who is busy, nudge a task, and combobulate scattered work into something you can follow.