Sibelius Seraphini
Co-Founder at OpenPix
São Paulo, São Paulo, Brazil
Summary
🤩
Rockstar🎓
Top SchoolSibelius Seraphini is a seasoned full-stack engineer and startup founder with 12 years of experience building product-led companies and instant payments solutions from São Paulo. As Co-Founder of Woovi and CTO roles at OpenPix, Feedback House and Entria, he blends hands-on engineering with leadership in payments, React/React Native ecosystems, GraphQL/Relay, and backend systems. He is an active open-source contributor with notable fixes and enhancements to high-profile projects like Relay, react-native-camera and Flow/TypeScript type definitions, reflecting deep expertise across frontend, mobile and database layers. His background includes Android database engineering, TypeScript/Flow typing improvements, and building camera integrations for React Native, showing practical cross-platform problem solving. Sibelius documents his technical thinking publicly via an extensive zettelkasten, signaling a disciplined, research-driven approach to product and engineering decisions.
12 years of coding experience
6 years of employment as a software developer
Exchange Student Computer Science, Exchange Student Computer Science at University at AlbanyBachelor's degree Computer Science, Bachelor's degree Computer Science at University of São PauloTechinal System Programming and Development, Techinal System Programming and Development at Federal Institute of São Paulo, São Paulo, Brazil
English, Portuguese, French
Stackoverflow
5,453reputation
555kreached
34answers
42questions
Github Skills (61)
libstdc10
libc10
typesc10
javascript10
draft-js-plugins10
lib10
flow-control10
react-native10
libudev10
build-definition10
sqlite10
testing10
flow-typed10
libdispatch10
typescript10
Programming languages (25)
Github contributions (5)
react-native-camera/react-native-camera
Dec 2017 - Oct 2020
A Camera component for React Native. Also supports barcode scanning!
Role in this project:
Mobile Developer (Android)
Mobile Developer (Android)Contributions:1 release, 2 reviews, 159 commits in 2 years 10 months
Contributions summary:Sibelius's contributions primarily focused on implementing and integrating a camera component within a React Native application. They added camera implementation for Android, mirroring the structure of an existing expo camera module. The code changes included setting up the necessary Android-specific components, and modifications to existing files, reflecting the creation of a functional camera interface within the React Native environment. This integration work is centered around providing camera functionalities within a React Native application specifically for the Android platform.
reactrncamerareact-nativecameracamera-component
facebook/relay
Dec 2015 - Oct 2019
Relay is a JavaScript framework for building data-driven React applications.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:26 reviews, 6 commits, 8 PRs in 3 years 10 months
Contributions summary:Sibelius contributed to the Relay framework by addressing several issues related to the codebase. Their work included fixing a non-standard arrow function call syntax, adding tests to mock null values, and resolving issues with default values in the mock payload generator. They also updated metadata handling to accommodate both commonjs and es modules, and enabled TSX on relay resolvers. The contributions span across various aspects of the framework including testing, mocking, and code generation.
data-drivenreactrelayreact-applicationsjavascript-framework
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