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Guilherme D'Alessandro

PROFILE

Guilherme D'alessandro

Contributed to multiple open source repositories, focusing on authentication, localization, and mobile development. In better-auth/better-auth, enhanced passkey authentication by enriching API responses with user context and aligning them with OpenAPI schemas, using TypeScript and backend testing to improve client integration and security. Addressed type safety in authentication flows by correcting session type imports, reducing runtime errors. In mrousavy/expo and expo/expo, improved accessibility and localization reliability, fixed calendar recurrence serialization for iOS, and increased Android printing traceability by dynamically deriving job names from file URIs. Work spanned Java, Swift, and TypeScript, emphasizing maintainability, inclusivity, and robust cross-platform user experiences.

Overall Statistics

Feature vs Bugs

33%Features

Repository Contributions

6Total
Bugs
4
Commits
6
Features
2
Lines of code
138
Activity Months4

Work History

April 2026

1 Commits • 1 Features

Apr 1, 2026

April 2026 monthly summary for better-auth/better-auth: Delivered Passkey Authentication Response Enrichment by adding user information to the authentication response and aligning it with the OpenAPI schema to improve client-side handling. Fixed a bug where passkey authentication wasn’t returning the user, ensuring end-to-end login flows provide correct user context. The change enhances client integration, reduces friction in authentication flows, and improves security visibility through consistent user data in API responses. Key contributor activity included a focused patch and review of the fix (commit ec20325173b28729809b13151980d11b1b13514c; "fix(passkey): verify passkey authentication isnt returning the user (#5209)") with co-authorship by Gustavo Valverde.

October 2025

1 Commits

Oct 1, 2025

October 2025 monthly summary focusing on stabilizing passkey authentication through improved type safety and targeted bug fixes. Delivered a critical correction to the Passkey authentication path by fixing the incorrect Session type import, enhancing type checking and reducing risk of runtime errors. This work strengthens authentication reliability and developer confidence in the passkey client, while maintaining code quality and contributing to long-term maintainability.

August 2025

1 Commits

Aug 1, 2025

August 2025 monthly summary focused on Android printing reliability and observability in expo/expo. Implemented dynamic derivation of the print job name from the URI file name to improve clarity and traceability of print jobs, reducing misnaming-related troubleshooting and enabling better analytics.

April 2025

3 Commits • 1 Features

Apr 1, 2025

April 2025 monthly summary for mrousavy/expo: Focused on accessibility, localization reliability, and calendar correctness. Key outputs include documentation accessibility improvement, timezone-change reactivity for localization hooks, and proper day-of-week serialization for iOS calendar recurrence, reinforcing inclusivity and scheduling accuracy across locales and devices.

Activity

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Quality Metrics

Correctness100.0%
Maintainability96.6%
Architecture96.6%
Performance96.6%
AI Usage23.4%

Skills & Technologies

Programming Languages

JavaKotlinMarkdownSwiftTypeScript

Technical Skills

API developmentAccessibilityAndroid DevelopmentAuthenticationBug FixingCalendar APIDocumentationExpo ModulesFrontend DevelopmentLocalizationMobile DevelopmentTypeScriptbackend developmentiOS Developmenttesting

Repositories Contributed To

3 repos

Overview of all repositories you've contributed to across your timeline

mrousavy/expo

Apr 2025 Apr 2025
1 Month active

Languages Used

MarkdownSwift

Technical Skills

AccessibilityBug FixingCalendar APIDocumentationExpo ModulesLocalization

better-auth/better-auth

Oct 2025 Apr 2026
2 Months active

Languages Used

TypeScript

Technical Skills

AuthenticationFrontend DevelopmentTypeScriptAPI developmentbackend developmenttesting

expo/expo

Aug 2025 Aug 2025
1 Month active

Languages Used

JavaKotlinMarkdown

Technical Skills

Android DevelopmentBug FixingMobile Development