Santz
PTEN

VINICIUS DOS SANTOS ROSA · FULL-STACK DEVELOPER

Complex ideas, software that works.

I build web and mobile products, integrations and automations. I like understanding the problem firsthand, writing code the team can maintain and staying involved through delivery.

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Portrait of Vinicius dos Santos Rosa
Carambeí, Brazil · open to remote work

01 / EXPERIENCE

Real products, end-to-end work.

Mood Solutions · Full-stack developer and QA

Aug 2024 — present

On AI Hub, I have worked across interfaces, services, integrations and quality assurance for generative AI features. Some work is confidential; these are public examples of my contributions:

  • Consolidated omnichannel inbox navigation and worked on MCP configuration interfaces.
  • Improved automation workflows, including staged follow-ups and fixes to Discord actions.
  • Fixed WhatsApp messaging and history synchronization flows, with tests for failures and reconnections.
AI Hub

02 / SELECTED PROJECTS

Built, published and evolving.

01Generative AI · team project

AI Hub

A Mood Solutions platform where I worked as a full-stack developer and QA. I contributed to the omnichannel inbox, automations, integrations and MCP configuration experience.

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02SaaS · web + mobile

Kairo

Management software for appointment-based businesses, covering scheduling, customers and metrics. Built with Next.js, React Native and PostgreSQL/Supabase. Live product, with no active users yet.

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03SaaS · point of sale

CartCloud

Multi-company sales software with real-time inventory. Next.js and TypeScript interface, with business logic in Node.js and PostgreSQL. Live product, with no active users yet.

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04Independent development

Santz

I build websites and tailored software for businesses, from initial scope through deployment. I work directly with clients to set content, priorities and deliverables.

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Earlier work

I built a sales system for Lari Rosa Moda Modesta, used in the store's daily operations since 2023, and websites for local clients.

03 / SKILLS

What I build — and how I work.

Web and mobile products

I build interfaces with React, Next.js and React Native, plus Node.js services, REST APIs, authentication and integrations.

Data and quality

I work with PostgreSQL, Supabase and NoSQL. I review flows, test failure cases and follow changes through deployment.

Agents and applied AI

I build workflows with tools, MCP, automation and retrieval-augmented generation (RAG). I know how to integrate models through OpenRouter and apply harness engineering principles: context, permissions, observability and evaluation.

SDD and AI-assisted development

I use spec-driven development (SDD) to define scope, acceptance criteria and verifiable tasks before implementation. Codex and Claude Code speed up the work; I check assumptions against the code and test the result against the specification.

B.S. in Software Engineering at Unicesumar, expected in 2027. Intermediate English. Currently studying Java and C#.