# Sergio Tomas

> Principal Software Engineer and Solutions Architect. React, Next.js, Node.js, Java, cloud and AI Engineering. Based in São Paulo, Brazil, with 14+ years in software. Bilingual site (English / Brazilian Portuguese).

Principal Software Engineer and architect, the technical reference for architecture and system design at companies like C&A and Claro — defining standards, designing highly available systems and driving products end to end.

Contact: jobs.sergiotomas@gmail.com · https://www.linkedin.com/in/sergiottomas

## Full content

- [Full profile and every technology page, in English](https://sergiotomas.dev/llms-full.txt)
- [Perfil completo e todas as páginas de tecnologia, em português](https://sergiotomas.dev/llms-full.pt.txt)

## Profile

- [Portfolio (English)](https://sergiotomas.dev/en/): experience, stack, skills, certifications and contact
- [Portfólio (Português)](https://sergiotomas.dev/pt/): experiência, stack, habilidades, certificações e contato
- [CV (PDF, English)](https://sergiotomas.dev/cv/Sergio_Tomas_CV_en.pdf)
- [CV (PDF, Português)](https://sergiotomas.dev/cv/Sergio_Tomas_CV_pt-BR.pdf)

## Languages

- [JavaScript](https://sergiotomas.dev/en/stack/javascript/): The language I have written every single year since 2012.
- [Java](https://sergiotomas.dev/en/stack/java/): Strongly typed back-ends built to last.
- [PHP](https://sergiotomas.dev/en/stack/php/): Pragmatic server-side scripting for the web.
- [Go](https://sergiotomas.dev/en/stack/go/): Simple, fast and built for concurrency.
- [HTML5](https://sergiotomas.dev/en/stack/html5/): Semantic, accessible and SEO-friendly markup.
- [CSS3](https://sergiotomas.dev/en/stack/css3/): Layouts that adapt to every screen.
- [.NET](https://sergiotomas.dev/en/stack/dotnet/): Microsoft's platform for enterprise applications.
- [GraphQL](https://sergiotomas.dev/en/stack/graphql/): Ask for exactly the data you need.

## Tools & platforms

- [React](https://sergiotomas.dev/en/stack/react/): Component-driven interfaces at scale.
- [Redux](https://sergiotomas.dev/en/stack/redux/): Predictable state for complex applications.
- [Redux-Saga](https://sergiotomas.dev/en/stack/reduxsaga/): Side effects, orchestrated.
- [Next.js](https://sergiotomas.dev/en/stack/nextjs/): React with rendering strategies built in.
- [Vue.js](https://sergiotomas.dev/en/stack/vuejs/): Progressive, approachable and productive.
- [Angular](https://sergiotomas.dev/en/stack/angular/): A complete framework for large applications.
- [Node.js](https://sergiotomas.dev/en/stack/nodejs/): JavaScript on the server, at scale.
- [Express](https://sergiotomas.dev/en/stack/express/): Minimal and flexible HTTP for Node.js.
- [NestJS](https://sergiotomas.dev/en/stack/nestjs/): Structured, scalable Node.js back-ends.
- [Spring](https://sergiotomas.dev/en/stack/spring/): The enterprise standard for Java services.
- [VTEX IO](https://sergiotomas.dev/en/stack/vtex/): Composable commerce on a serverless platform.
- [MySQL](https://sergiotomas.dev/en/stack/mysql/): The open-source relational workhorse.
- [SQL Server](https://sergiotomas.dev/en/stack/sqlserver/): Microsoft's enterprise relational database.
- [Oracle](https://sergiotomas.dev/en/stack/oracle/): Mission-critical relational data.
- [MongoDB](https://sergiotomas.dev/en/stack/mongodb/): Flexible documents for evolving domains.
- [Firestore](https://sergiotomas.dev/en/stack/firebase/): Real-time data, serverless by default.
- [DynamoDB](https://sergiotomas.dev/en/stack/dynamodb/): Single-digit millisecond scale on AWS.
- [AWS](https://sergiotomas.dev/en/stack/aws/): Scalable infrastructure, designed deliberately.
- [Azure](https://sergiotomas.dev/en/stack/azure/): DevOps and cloud on Microsoft's platform.
- [Google Cloud](https://sergiotomas.dev/en/stack/gcp/): Data, containers and serverless on Google's cloud.
- [Jenkins](https://sergiotomas.dev/en/stack/jenkins/): Automating the path to production.
- [Jest](https://sergiotomas.dev/en/stack/jest/): Confidence through automated tests.
- [Claude Code](https://sergiotomas.dev/en/stack/claude/): AI Engineering with engineering discipline.
- [WordPress](https://sergiotomas.dev/en/stack/wordpress/): Content-driven sites, delivered fast.
- [Bootstrap](https://sergiotomas.dev/en/stack/bootstrap/): Responsive UI building blocks.
- [jQuery](https://sergiotomas.dev/en/stack/jquery/): Where interactive web development began for many of us.
- [Cordova](https://sergiotomas.dev/en/stack/cordova/): Web technologies, packaged as mobile apps.
- [Photoshop](https://sergiotomas.dev/en/stack/photoshop/): Where my career started: pixels.
- [Illustrator](https://sergiotomas.dev/en/stack/illustrator/): Vector graphics with precision.

## Optional

- [JavaScript (PT)](https://sergiotomas.dev/pt/stack/javascript/): A linguagem que escrevo todos os anos desde 2012.
- [Java (PT)](https://sergiotomas.dev/pt/stack/java/): Back-ends fortemente tipados, feitos para durar.
- [PHP (PT)](https://sergiotomas.dev/pt/stack/php/): Scripting server-side pragmático para a web.
- [Go (PT)](https://sergiotomas.dev/pt/stack/go/): Simples, rápida e feita para concorrência.
- [HTML5 (PT)](https://sergiotomas.dev/pt/stack/html5/): Markup semântico, acessível e amigável para SEO.
- [CSS3 (PT)](https://sergiotomas.dev/pt/stack/css3/): Layouts que se adaptam a qualquer tela.
- [.NET (PT)](https://sergiotomas.dev/pt/stack/dotnet/): A plataforma da Microsoft para aplicações corporativas.
- [GraphQL (PT)](https://sergiotomas.dev/pt/stack/graphql/): Peça exatamente os dados de que precisa.
- [React (PT)](https://sergiotomas.dev/pt/stack/react/): Interfaces orientadas a componentes, em escala.
- [Redux (PT)](https://sergiotomas.dev/pt/stack/redux/): Estado previsível para aplicações complexas.
- [Redux-Saga (PT)](https://sergiotomas.dev/pt/stack/reduxsaga/): Efeitos colaterais, orquestrados.
- [Next.js (PT)](https://sergiotomas.dev/pt/stack/nextjs/): React com estratégias de renderização embutidas.
- [Vue.js (PT)](https://sergiotomas.dev/pt/stack/vuejs/): Progressivo, acessível e produtivo.
- [Angular (PT)](https://sergiotomas.dev/pt/stack/angular/): Um framework completo para grandes aplicações.
- [Node.js (PT)](https://sergiotomas.dev/pt/stack/nodejs/): JavaScript no servidor, em escala.
- [Express (PT)](https://sergiotomas.dev/pt/stack/express/): HTTP mínimo e flexível para Node.js.
- [NestJS (PT)](https://sergiotomas.dev/pt/stack/nestjs/): Back-ends Node.js estruturados e escaláveis.
- [Spring (PT)](https://sergiotomas.dev/pt/stack/spring/): O padrão corporativo para serviços Java.
- [VTEX IO (PT)](https://sergiotomas.dev/pt/stack/vtex/): Commerce componível em uma plataforma serverless.
- [MySQL (PT)](https://sergiotomas.dev/pt/stack/mysql/): O banco relacional open source de confiança.
- [SQL Server (PT)](https://sergiotomas.dev/pt/stack/sqlserver/): O banco relacional corporativo da Microsoft.
- [Oracle (PT)](https://sergiotomas.dev/pt/stack/oracle/): Dados relacionais de missão crítica.
- [MongoDB (PT)](https://sergiotomas.dev/pt/stack/mongodb/): Documentos flexíveis para domínios em evolução.
- [Firestore (PT)](https://sergiotomas.dev/pt/stack/firebase/): Dados em tempo real, serverless por padrão.
- [DynamoDB (PT)](https://sergiotomas.dev/pt/stack/dynamodb/): Escala de milissegundos na AWS.
- [AWS (PT)](https://sergiotomas.dev/pt/stack/aws/): Infraestrutura escalável, desenhada com intenção.
- [Azure (PT)](https://sergiotomas.dev/pt/stack/azure/): DevOps e nuvem na plataforma da Microsoft.
- [Google Cloud (PT)](https://sergiotomas.dev/pt/stack/gcp/): Dados, containers e serverless na nuvem do Google.
- [Jenkins (PT)](https://sergiotomas.dev/pt/stack/jenkins/): Automatizando o caminho até produção.
- [Jest (PT)](https://sergiotomas.dev/pt/stack/jest/): Confiança por meio de testes automatizados.
- [Claude Code (PT)](https://sergiotomas.dev/pt/stack/claude/): AI Engineering com disciplina de engenharia.
- [WordPress (PT)](https://sergiotomas.dev/pt/stack/wordpress/): Sites orientados a conteúdo, entregues rápido.
- [Bootstrap (PT)](https://sergiotomas.dev/pt/stack/bootstrap/): Blocos de construção para UI responsiva.
- [jQuery (PT)](https://sergiotomas.dev/pt/stack/jquery/): Onde o desenvolvimento web interativo começou para muitos de nós.
- [Cordova (PT)](https://sergiotomas.dev/pt/stack/cordova/): Tecnologias web empacotadas como apps mobile.
- [Photoshop (PT)](https://sergiotomas.dev/pt/stack/photoshop/): Onde minha carreira começou: pixels.
- [Illustrator (PT)](https://sergiotomas.dev/pt/stack/illustrator/): Gráficos vetoriais com precisão.