Fernando Sanz - Android Developer at Mutua Madrileña

Fernando Sanz

Android Developer at Mutua Madrileña

Valladolid, Castile and León, Spain

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Summary

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Rockstar

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Top School

Fernando Sanz is an Android developer with seven years of hands-on experience building robust mobile apps using Kotlin and Java, currently working in Valladolid for Mutua Madrileña and ElParking. He has contributed to notable open-source projects like the ownCloud Android app and its library, improving ExoPlayer-based video playback, camera uploads, and migrating critical components from Java to Kotlin. Comfortable with modern Android stack (Jetpack, ROOM, Flow, Compose), DI, MVVM and Clean Architecture, he also brings CI/CD, unit and interface testing to delivery pipelines. His background spans sectors from parking and insurance to blockchain integrations and BLE/Firebase solutions, showing versatility across consumer and enterprise use cases. Not obvious at first glance: he has practical experience converting legacy Java codebases to Kotlin while preserving server API integrations and complex database migrations. He combines disciplined agile practices with an open-source mindset, making him effective both in product teams and community-driven projects.

7 years of coding experience

5 years of employment as a software developer

Engineering Degree System Computer Science, Engineering Degree System Computer Science at Universidad de Valladolid

Computer Programming/Programmer General Multiplatform application development, Computer Programming/Programmer General Multiplatform application development at Gregorio Fernández (study centre)

Spanish, English

Github Skills (17)

kotlin10

json-parser10

json10

jsonp10

parsing10

android10

moshi10

exoplayer10

owncloud10

api-design9

java9

javas9

database-migration8

uid8

front-end-development8

Programming languages (1)

Kotlin

Github contributions (5)

owncloud/android

Jul 2021 - May 2022

:phone: The ownCloud Android App

Role in this project:

Mobile Developer (Android)

Contributions:1 release, 196 reviews, 518 commits in 9 months

Contributions summary:Fernando primarily contributed to the ownCloud Android app by modifying various Kotlin and Java files. Their contributions included fixing bugs related to the video player using ExoPlayer and improving its functionality. They also worked on camera uploads, adding features to upload pictures and videos based on charging and Wi-Fi conditions. Furthermore, the user made changes to database migrations and UI components.

phoneowncloudandroidandroid-appkotlin

owncloud/android-library

Aug 2021 - May 2022

:phone: The ownCloud Android Library

Role in this project:

Mobile Developer (Android)

Contributions:9 reviews, 15 commits, 5 PRs in 8 months

Contributions summary:Fernando primarily focused on refactoring and modifying the Android-specific library, `owncloud/android-library`. Their work involved migrating code from Java to Kotlin, specifically related to retrieving and parsing share information. They also addressed bugs in the share creation process. The user demonstrated a strong understanding of the library's internal structure, including how it interacts with the ownCloud server API.

phoneowncloudandroid-libraryandroidkotlin

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