Freelancer profile translated to English.
Back to original languageAbout Fer
I transform complex requirements into fluid, maintainable, and market-ready mobile applications.
I'm Fernando, a Senior Mobile Developer specializing in Flutter & Dart based in Barcelona. With over 6 years of application development experience, I combine the robustness of software engineering with a holistic product vision acquired as a startup co-founder.
My approach is not just about writing code, but about being your technological partner. I specialize in defining architecture from scratch for new projects and modernizing applications that need to scale.
WHAT CAN I DO FOR YOU?
End-to-End Development (MVP to Production): I create complete ecosystems. I recently developed a comprehensive solution for Levitation Training that includes a Mobile App (iOS/Android), a Web Admin Panel, and a Serverless Backend.
App Rescue and Modernization: If your code is hard to maintain, I can refactor it. At Fynkus, I migrated a legacy codebase to Clean Architecture, implemented Riverpod, and integrated AI (ChatGPT) for real-time translation.
Enterprise Applications: Experience working with high quality standards for major clients like Decathlon Spain, developing critical internal tools integrated with Firebase.
TECHNOLOGY STACK
Core: Flutter, Dart (iOS, Android, Web).
Architecture: Clean Architecture, SOLID, MVVM.
State Management: BLoC/Cubit, Riverpod, Provider.
Backend & Cloud: Firebase (Firestore, Auth, Cloud Functions), REST APIs.
Integrations: Stripe, Google Pay, Apple Pay, Google Maps, OpenAI API, Bluetooth.
LANGUAGES & METHODOLOGY
I work agile (Jira, Trello) and communicate fluently in Spanish, English, and French, facilitating collaboration with international teams.
English
Fluent
Spanish
Native or bilingual
French
Conversational
Catalan
Basic
Can work on-site
Barcelona (up to 50km), Valencia (up to 100km), Madrid (up to 100km), Palma (up to 100km)
Experience
- Levitation TrainingFull Stack ProgrammerNovember 2024 - January 2026 (1 year and 2 months)Barcelona, SpainSports Climbing Training EcosystemEnd-to-End development of a platform for athlete management and tracking.Mobile App (iOS/Android): Client for trainees developed in Flutter.Admin Web Panel: Standalone dashboard in Flutter Web for coach management.State Management: Implementation of BLoC / Cubit for predictable and decoupled state management from the UI.Architecture: Clean Architecture structured by layers (Data, Domain, Presentation) and organized by Features.Backend & Infra: Stack on Firebase (Firestore, Auth), serverless logic with Cloud Functions, and Push Notifications.Code Quality: Application of SOLID and Clean Code principles to ensure maintainability.Stack: Flutter, Dart, BLoC/Cubit, Firebase, Cloud Functions, NoSQL.
- FYNKUSApplication DeveloperREAL ESTATEMay 2023 - April 2025 (1 year and 11 months)Barcelona, SpainProperty ManagementI led the integral refactor and evolution of the mobile application for managing building communities, modernizing both the technical stack and user experience.Architecture & Refactor: Migration of a legacy codebase to a robust Clean Architecture organized by layers (Data, Domain, Presentation) and structured by Features.State Management: Implementation of Riverpod for reactive, testable, and efficient state management.AI Integration: Integration of ChatGPT API (OpenAI) to implement an intelligent real-time translation system with support for 11 languages.UI/UX Modernization: Complete implementation of a new user interface, prioritizing usability and performance on iOS and Android devices.API Integration: Consumption and optimization of services via REST API, ensuring fluid communication with the company's backend.Best Practices: Strict application of Clean Code and SOLID principles to guarantee product scalability.Stack: Flutter, Dart, Riverpod, REST API, OpenAI API (GPT), Clean Architecture.
- Dana Positive Maternal Health CMSFlutter DeveloperHEALTH AND WELLNESSNovember 2022 - February 2023 (3 months)Barcelona, SpainDevelopment of a CMS in Flutter, communicating with REST APIs, JWT token for authentication. Audio and image upload, and HTML editor.Bloc + Cubit for state management.Hexagonal Clean Architecture.
Reviews
Á
Álvaro
Levitation training
Reviewed on 3/21/2024
I have been working with Fer for almost 6 months on mobile app development. Both communication and involvement have been excellent, and we have achieved the results we expected. 100% recommended!
Amador
Decathlon Spain
Reviewed on 10/11/2023
We are working with Fer again after the good experience we had a few months ago. Again, Fer helped us immensely to get our project done as soon as possible, proactively, with solutions, and always with a smile. Thank you, Fer, we will see each other again, I'm sure.
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Education
- Flutter: Complete Guide to Development for iOS and Android Your ProgressUdemyEl curso se enfoca en el desarrollo de aplicaciones móviles nativas usando una sola base de código con el SDK de Google Flutter: 1- State Management / 2- Tokens / 3- Widgets comunes y no tan comunes / 4- Dart / 5- Firebase REST API y REST Auth / 6- Cámara / 7- Galería de imágenes / 8- Carga de archivos a la mediante servicios REST / 9- Modelos / 10- Providers / 11- Patrón Bloc / 12- Streams / 13- Notificaciones Push / 14- Futures / 15- Despliegues en la AppStore / 16- Despliegues en la PlayStore / 17- Generación de APKs de 64 bits / 18- Diseños de aplicaciones móviles / 19- Lectura de archivos JSON / 20- CRUD hacia servicios REST / 21- SQLite – CRUD / 22- PageViews / 23- InfiniteScrolls / 24- Pull to refresh / 25- Uso de mapas / 26- Preferencias de usuario / 27- Storage nativo / 28- Instalaciones de paquetes / 29- Formularios
- Build Native Mobile Apps with FlutterUdacity.com2019The Flutter Framework Understand the fundamentals of the Flutter framework, incorporate widgets and state in your app, and use Flutter's tools to enhance your development process. Building Interactive Apps Customize your app with Material Design, themes, assets, and more. Make your app interactive, and retrieve local and real-time data from the web.
Certifications
- Flutter Front-end DeveloperUdemy2019