Cristian Oliveira
Senior Software Engineer at Wire
Berlin, Germany
Summary
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Rockstar🎓
Top SchoolCristian Oliveira is a Senior Software Engineer based in Berlin with over a decade of hands-on experience building full-stack payment and e-commerce systems. He led the design and implementation of SumUp’s online payments ecosystem—APIs, hosted checkout, widgets and plugins—using Typescript, React, Node.js and Go while driving observability and SLI/SLO practices to scale global traffic. Earlier roles spanned frontend performance and conversion optimization, realtime systems for major media portals, and Android/Java work, giving him a rare blend of product-focused frontend expertise and backend reliability. An active open-source contributor, he has implemented UI components for SumUp’s Circuit design system and fixed bugs in the widely used Facebook Android SDK, demonstrating attention to developer experience and code quality. Colleagues describe him as pragmatic and data-driven, able to translate experiments and telemetry into measurable revenue and stability improvements.
12 years of coding experience
6 years of employment as a software developer
Johns Hopkins UniversityTechnical, Computer Technology/Computer Systems Technology, Technical, Computer Technology/Computer Systems Technology at Flexxo - Centro de Formação em TIBachelor's degree, Information Systems Administration, Bachelor, Bachelor's degree, Information Systems Administration, Bachelor at Faculdade da Serra Gaúcha
Portuguese, English, German
Stackoverflow
760reputation
60kreached
13answers
2questions
Github Skills (29)
circuit10
javascript10
react-components10
android-sdk10
java10
react-component10
javas10
component-library10
error-handling10
react10
storybook9
css9
jtest9
junit9
props8
Programming languages (18)
Github contributions (5)
facebook/facebook-android-sdk
Oct 2014 - Nov 2015
Used to integrate Android apps with Facebook Platform.
Role in this project:
Mobile Developer (Android)
Mobile Developer (Android)Contributions:12 commits, 3 PRs, 7 comments in 1 year
Contributions summary:Cristian primarily focused on bug fixes and improvements within the Android SDK. They addressed a NullPointerException related to image downloading timeouts, correcting error handling in the ImageDownloader class. Furthermore, the user made additions to the LoginButton class by adding missing imports and enhanced test coverage by adding tests for ShareContentValidation, suggesting active contributions toward improving the library's functionality and reliability. They also made minor code refactoring and cleaning improvements, indicating a dedication to code quality.
android-appssdkandroidfacebookintegrate
sumup-oss/circuit-ui
Jan 2018 - Feb 2018
SumUp's design system for the web
Role in this project:Front-end Developer
Front-end DeveloperContributions:8 commits, 8 PRs, 25 pushes in 28 days
Contributions summary:Cristian primarily contributed to the development of UI components within the `circuit-ui` design system. They added new components like Tooltip and Tag, implementing their functionality and styling. The commits demonstrate proficiency in React and related technologies. They also wrote tests for the created components and integrated them with Storybook.
reactsumupcircuit-uidesign-systemreact-components
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