Phone: +55 17 99645 7741
Email: me@sebastiao.me
Location: São Paulo, SP, Brazil
Website: sebastiao.me
LinkedIn: sebasrib
GitHub: sebasrib

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

Software Engineer, AI/R Company - Vivo Telefónica – São Paulo, SP, Brazil

Mar 2024 – present

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

Software Engineer Intern, AI/R Company – São Paulo, SP, Brazil

Mar 2023 – Dec 2023

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

Census Data Analyst, Brazilian Institute of Geography and Statistics (IBGE) – Araraquara, SP, Brazil

June 2022 – Dec 2022

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

Centro Universitário Internacional, BS in Software Engineering – Araraquara, SP, BrazilApr 2022 – Apr 2026

Skills

Natural Languages: English (B2), Portuguese (native)

Programming Languages: Typescript, Java, Javascript, Python, a little bit of Haskell

Frameworks & Runtimes: Nest.js, React.js, Spring Boot, Express, Koa, Apollo, Node.js

Security & IAM: Keycloak, OAuth2, OpenID Connect (OIDC), Open Policy Agent (OPA)

Data & Storage: PostgreSQL, MongoDB, MySQL, AWS S3, Azure Blob Storage, Redis, Valkey

Architecture & Patterns: Microservices, DDD (Domain-Driven Design), Clean Architecture, RESTful APIs, Functional Programming

Certifications: AWS Certified Cloud Practitioner, OCI Certified Developer Professional, OCI Certified Data Science Professional, OCI Certified Generative AI Professional