Gabriel Fontán Rodiño

Experience

1. 2023 – Present3 yrs 10 mos

   Android Developer (Kotlin / Jetpack Compose)

   Open Source

   Android application development in the open source ecosystem, accumulating millions of downloads. Experience in modern architecture, integration of complex libraries and maintenance of projects with real users.

   • Android app development with Kotlin, Jetpack Compose and following Material 3 guidelines
   • Applications with millions of downloads and thousands of active users
   • Experience integrating complex libraries (yt-dlp, ML Kit, TagLib)
   • Refactoring, optimization and maintenance of open source projects

   • Docucraft

     2025 – Present

     Development of document scanning application based on Google ML Kit. Implementation of image processing to improve quality, automatic correction and removal of imperfections.

   • Metadator

     2024 – Present

     App for editing music tags, artwork and lyrics, rewritten from scratch and in production on Google Play. 25-module architecture, metadata search on MusicBrainz and Deezer, synced lyrics from LRCLIB, batch editing and lossless saving with undo.

   • WeMotion

     2026 – Present

     Development of real-time motion emulation system that converts smartphones into Wiimote-type controllers. Implementation of IMU sensor data processing and low-latency UDP communication to ensure precision and immediate response.

   • AI Translator

     2026

     Hybrid AI translation app built for an upcoming GDG Ourense workshop. It uses Gemini Nano on-device when available and falls back to the Gemini API in the cloud. Includes on-screen visual effects built with shaders.

   • Rush

     2026

     Performance work on a synced-lyrics app using Jetpack Compose best practices. Roughly 50% less lag and fewer unnecessary recompositions on the main screen.

   • EdgeFlow

     2025 – Present

     Android application for content transfer from Sony cameras via Wi-Fi. Development of modern architecture and improved user experience compared to legacy solutions.

   • Seal

     2023 – 2025

     Contribution to application with +9M downloads. Modularization of dependency for Python module execution (yt-dlp), optimizing app size and architecture.

   • Spowlo

     2023 – 2025

     Own application with +500k downloads. Integration and adaptation of libraries through forks to support new functionalities.

   • SongSync

     2023 – 2025

     Complete refactoring and maintenance. Implementation of lyrics embedding in audio files using TagLib.

   • Jetispot

     2023

     Maintenance and improvement of music clients. Bug fixes, code modernization and adaptation to new technologies like Jetpack Media 3.

   Show 7 more
2. 2020 – 20221 yr 8 mos

   Windows Applications Developer (C# / WinUI)

   Open Source

   Contributions to open source projects focused on Windows applications, including streaming tools and modern desktop clients.

   • Windows application development using C# and WinUI
   • Experience in open source projects with real users
   • Performance improvement, maintainability and internationalization

   • Overlay for OBS (Open Broadcaster Software) for the video game 'Valorant'

     2020 – 2021

     Development of OBS overlay that displays the user's competitive rank. Implementation of internationalization system and code refactoring to improve maintainability.

   • FluentHub - GitHub Client for Windows

     2022

     Development of application based on WinUI following Windows modern design system. Contributions in interface, architecture and general code improvements.

Featured projects

• 

  DocucraftActive

  • GitHub
  • Google Play

  github.com/BobbyESP/Docucraft

  Privacy-first document scanner with on-device processing and high-quality OCR. Simple and modern interface based on Material You.

  Google ML Kit · Material You Design · No ads

  

• E

  EdgeFlow

  • GitHub

  github.com/BobbyESP/EdgeFlow

  Modern implementation of Sony Imaging Edge protocol through reverse engineering for high-speed transfer.

  Analysis of proprietary network protocols · Bypass of official software limitations · Developed in Kotlin

• W

  WeMotionActive

  • GitHub

  github.com/BobbyESP/WeMotion

  Transform smartphones into functional Wiimotes through real-time motion emulation.

  Android IMU sensors · Low-latency UDP networking · Real-time systems

• L

  Liri

  A desk clock that shows the synced lyrics of whatever you are listening to, with C++ firmware for an ESP32-S3 with an AMOLED screen and a Kotlin Multiplatform bridge. On hold: the plan is to turn it into a highly customizable handheld music player.

  ESP32-S3 and AMOLED in C++ · Kotlin Multiplatform · Custom WebSocket protocol

• 

  MetadatorActive

  • GitHub
  • Google Play

  github.com/BobbyESP/Metadator

  Music tag, artwork and lyrics editor, rewritten from scratch and in production on Google Play. It only writes what you change, and every save can be undone.

  Rewritten with 25 modules · MusicBrainz, Deezer and LRCLIB · Material 3 Expressive

  

• T

  TM1638

  • GitHub

  github.com/BobbyESP/TM1638

  Complete C library for controlling TM1638 chip-based display and keyboard modules via STM32 microcontrollers.

  Developed in C · Use of STM32 HAL Drivers · Control of 7-segment displays, LEDs and buttons

• 

  SongSyncActive

  • GitHub

  github.com/Lambada10/SongSync

  Android application for downloading and synchronizing song lyrics (LRC) for local music libraries.

  +1200 stars on GitHub · Developed with Jetpack Compose · Community management (+40 contributors)

Skills

• Android & KotlinSpecialty

  My specialty. Modern native apps with Compose and Material 3 Expressive, from the UI to widgets, media playback and background work.

  • Kotlin
  • Jetpack Compose
  • Material 3 Expressive
  • Coroutines & Flow
  • Navigation 3
  • Room
  • DataStore
  • WorkManager
  • Glance
  • Media3
  • Kotlin Multiplatform

  Used in Docucraft, Metadator, WeMotion, SongSync

• Architecture & qualitySpecialty

  Multi-module projects with api/implementation layers (25 modules in Metadator), dependency injection, performance profiles and tests.

  • Multi-module architecture
  • Clean Architecture
  • Koin
  • Hilt
  • Gradle convention plugins
  • Baseline Profiles
  • Compose Stability
  • JUnit
  • MockK
  • Turbine
  • LeakCanary

  Used in Metadator, Docucraft, WeMotion

• Networking & protocolsSolid

  HTTP clients, WebSockets and low-latency binary protocols, some of them rebuilt through reverse engineering.

  • Ktor
  • OkHttp
  • WebSockets
  • UDP (DSU protocol)
  • kotlinx.serialization
  • Reverse engineering

  Used in WeMotion, EdgeFlow, Liri

• MediaSolid

  Playback, reading the device's media library and editing audio tags, artwork and lyrics.

  • Media3 / ExoPlayer
  • MediaStore
  • TagLib
  • FFmpeg
  • yt-dlp

  Used in Metadator, SongSync, Seal, Spowlo

• AI & Machine LearningSolid

  Models that run on the phone itself with the cloud as a fallback, plus offline scanning and OCR.

  • ML Kit (scanner & OCR)
  • Gemini Nano
  • Firebase AI
  • Genkit

  Used in Docucraft, AI Translator

• Backend & webSolid

  TypeScript APIs with validation and OpenAPI docs, and static sites like this portfolio.

  • TypeScript
  • Node.js
  • Express
  • Bun
  • Zod
  • OpenAPI
  • Astro
  • React

  Used in This portfolio, Personal APIs

• Shipping & DevOpsSolid

  Continuous integration, automated releases and Google Play publishing with crash reporting.

  • GitHub Actions
  • Fastlane
  • Google Play
  • Firebase Crashlytics
  • Gradle
  • Docker

  Used in Docucraft, Metadator

• Hardware & embeddedGrowing

  C/C++ firmware for microcontrollers and Python tooling for everyday tasks.

  • C
  • C++
  • STM32 HAL
  • ESP32
  • PlatformIO
  • Arduino
  • Python

  Used in TM1638, Liri

Android & Kotlin

Kotlin · Jetpack Compose · Material 3 Expressive · Coroutines & Flow · Navigation 3 · Room · DataStore · WorkManager · Glance · Media3 · Kotlin Multiplatform

Architecture & quality

Multi-module architecture · Clean Architecture · Koin · Hilt · Gradle convention plugins · Baseline Profiles · Compose Stability · JUnit · MockK · Turbine · LeakCanary

Networking & protocols

Ktor · OkHttp · WebSockets · UDP (DSU protocol) · kotlinx.serialization · Reverse engineering

Media

Media3 / ExoPlayer · MediaStore · TagLib · FFmpeg · yt-dlp

AI & Machine Learning

ML Kit (scanner & OCR) · Gemini Nano · Firebase AI · Genkit

Backend & web

TypeScript · Node.js · Express · Bun · Zod · OpenAPI · Astro · React

Shipping & DevOps

GitHub Actions · Fastlane · Google Play · Firebase Crashlytics · Gradle · Docker

Hardware & embedded

C · C++ · STM32 HAL · ESP32 · PlatformIO · Arduino · Python

Education

• 2024 – Present

  Bachelor's Degree in Computer Science Engineering

  Universidade de Vigo (Escola Superior de Enxeñaría Informática) · Average grade: 7.9

• 2022 – 2024

  Technological Sciences High School

  IES de Vilalonga · Average grade: 7.17

• 2018 – 2022

  Compulsory Secondary Education

  IES de Meaño

Certificates

• May 2024

  English | Preliminary English Test

  Cambridge English · Score: 161/170 (B2 Level)

Volunteering

• 2025 – Present

  Organizer

  GDG Ourense

  I participate in the organization and logistical support of technological and dissemination events organized by the GDG Ourense community. My tasks include coordinating activities, promoting events, placing informational posters and supporting the organizing team during the events.