name: Sebastião Leonardo Ribeiro Junior
location: São Paulo, SP, Brazil
email: me@sebastiao.me
phone: +55-17-9-9645-7741
website: https://sebastiao.me
social_networks:
- network: LinkedIn
    username: sebastiaome
- network: GitHub
    username: sebastiaome
sections:
summary:
    - Software Engineer with a proven track record of delivering **high-availability solutions** for **100M+ users**. Expertise in **Node.js**, **Java**, and **Python**, with a specialized focus on **Microsservices**, **IAM (Keycloak, OAuth, OIDC)** and cloud architecture **(AWS and OCI Certified)**. Combines a strong **analytical foundation** - including data decision-making for **Brazil's National Census** - with a drive to bridge complex backend architecture and business growth.
experience:
    - company: AI/R Company - Vivo Telefónica
    position: Software Engineer
    date:
    start_date: 2024-03
    end_date:
    location: São Paulo, SP, Brazil
    summary:
    highlights:
        - Developed and maintained critical **Java** and **Node.js** microservices for **Vivo (Telefónica)**, one of Brazil's **largest** telecommunications companies with over **100M customers**
        - Architected scalable **RESTful APIs** with **automated tests** that supported increase in digital transaction volume without performance degradation
        - Integrated and extended secure authentication flows using **Keycloak (OAuth2 and OIDC)** to support a 100M+ user identity ecosystem. Developed custom access control that **blocked unauthorized access attempts**
        - Developed scalable data solutions using **MongoDB** and **Redis** to manage high-traffic data and persistent storage
        - Developed and integrated cloud and on-premise solutions, including **Git, Kafka, Grafana, OpenTelemetry, Kubernetes, and Azure Blob Storage**, to enhance system observability and delivery
    - company: AI/R Company
    position: Software Engineer Intern
    date:
    start_date: 2023-03
    end_date: 2023-12
    location: São Paulo, SP, Brazil
    summary:
    highlights:
        - Learned the **development lifecycle** of distributed services to develop backend features in **Node.js (Nest.js)**, ensuring they met production standards
        - Assisted the engineering team in improving data flow reliability by developing integration layers for **PostgreSQL** and **Redis**, learning to optimize query performance for production environments
        - Learned enterprise **software development patterns** by assisting senior engineers in the technical design discussions
    - company: Brazilian Institute of Geography and Statistics (IBGE)
    position: Census Data Analyst
    date:
    start_date: 2022-06
    end_date: 2022-12
    location: Araraquara, SP, Brazil
    summary:
    highlights:
        - Automated data validation processes for the **National Census** using analytical tools, ensuring 99%+ data integrity across demographic datasets
        - Interpreted complex datasets to **support national-level decision-making** and **public policy development** through precise statistical reporting
education:
    - institution: Centro Universitário Internacional
    area: Software Engineering
    degree: BS
    date:
    start_date: 2022-04
    end_date: 2026-04
    location: Araraquara, SP, Brazil
    summary:
    highlights:
skills:
    - label: Natural Languages
    details: English (B2), Portuguese (native)
    - label: Programming Languages
    details: Typescript, Java, Javascript, Python, a little bit of Haskell
    - label: Frameworks & Runtimes
    details: Nest.js, React.js, Spring Boot, Express, Koa, Apollo, Node.js
    - label: Security & IAM
    details: Keycloak, OAuth2, OpenID Connect (OIDC), Open Policy Agent (OPA)
    - label: Data & Storage
    details: PostgreSQL, MongoDB, MySQL, AWS S3, Azure Blob Storage, Redis, Valkey
    - label: Architecture & Patterns
    details: Microservices, DDD (Domain-Driven Design), Clean Architecture, RESTful APIs, Functional Programming
    - label: Certifications
    details: AWS Certified Cloud Practitioner, OCI Certified Developer Professional, OCI Certified Data Science Professional, OCI Certified Generative AI Professional