Production mobile apps
Experience contributing to live apps on Google Play and the App Store, from feature work to release validation.
Flutter / Mobile Developer · Barcelona · Hybrid / Remote
Hi, I'm Mercedes.
I help product teams ship reliable mobile apps.
Flutter / Mobile Developer for product teams. I build maintainable mobile applications with clean architecture, REST API integration, QA validation, and release ownership across production delivery workflows.
FlutterDartKotlinSwiftFirebaseREST APIsCI/CDQA
What I do
What I bring as a mobile developer
Practical engineering that turns into shipped, maintainable mobile products.
Clean architecture
Layered codebases, repository pattern and dependency injection across Flutter, Kotlin and Swift projects.
Release & CI/CD workflows
Comfortable with Jenkins pipelines, GitLab release tags and GitHub Actions to ship safely and repeatably.
QA & product validation
Strong debugging mindset, attention to edge cases and collaboration with QA and product to ensure quality.
About
Software engineer,
mobile by craft.
Mercedes F. Gonzalez Cejas
Barcelona, Spain
Software Engineer specialized in mobile development, with experience maintaining and delivering production mobile applications used by real users.
I work mainly with Flutter, Android / Kotlin and iOS / Swift, and I care deeply about clean architecture, maintainability, API integration, debugging and product quality.
DevDigi is my personal developer brand, where I showcase my mobile work, projects and technical growth — not an agency, just my craft as a mobile engineer.
FlutterKotlinSwiftClean ArchitectureREST APIsCI/CD
Experience
Experience building real mobile apps
Worldline Global Services
Native Apps Developer
- Contributed to production mobile applications across Flutter, Android and iOS.
- Worked on La Mercè, a public Flutter app released to production for a major Barcelona cultural event.
- Implemented the air quality feature for Barcelona a la Butxaca, a live public app.
- Supported Jenkins-based CI/CD workflows, GitLab release tags, Google Play and App Store release validation.
- Supported manual QA for Nescafé Dolce Gusto, using Jira, structured test plans and test cases to validate reconnection and brew flows with NEO1 and NEO2 machines.
- Participated in QA validation, debugging, Jira-based workflows and Agile/Scrum delivery cycles.
- Flutter
- Dart
- Android
- Kotlin
- iOS
- Swift
- Jenkins
- GitLab
- Jira
- Google Play
- App Store
- QA
- Test Plans
Worldline Global Services
Native Apps Developer Intern
- Completed mobile technical training across Android, iOS, Flutter, testing, and validation workflows.
- Built an Android practice app for income, spending, and savings with Kotlin, Jetpack Compose, Koin, and encrypted local preferences.
- Created UIKit and SwiftUI character browser apps to compare native iOS patterns with the Jikan API.
- Built a Flutter bridge app to connect mobile concepts across platforms.
- Practiced testing, validation, incident resolution, and Jira-based tracking in delivery workflows.
- Android
- Kotlin
- Jetpack Compose
- EncryptedSharedPreferences
- Koin
- iOS
- UIKit
- SwiftUI
- Flutter
- Dart
- Testing
- Validation
- Jira
Avanade
Front-End Developer Intern
- Built and customized internal solutions using PowerApps and tools from the Microsoft ecosystem.
- Collaborated with cross-functional teams to deliver front-end features for business workflows.
- PowerApps
- Microsoft 365
- Power Platform
Featured project
Inkscroller
Full-stack manga reader app · in development
Inkscroller
In-development full-stack manga reader composed of a Flutter frontend and a FastAPI backend for catalogue discovery, reader flows, and authenticated preferences.
- Flutter
- Dart
- FastAPI
- Python
- PostgreSQL
- Firebase Auth
- Railway
- Riverpod
- Jikan API
- MangaDex
Projects
Selected work
A mix of full-stack mobile, native Android and iOS, and web — each one focused on craft.
Learning projects
Worldline internship learning projects across native iOS and Android development.
AppSwiftUI
Worldline internship learning path: SwiftUI, API mapping, navigation, and reactive state.
- Swift
- SwiftUI
- URLSession
- Jikan API
- ObservableObject
Demonstrates: Native iOS fundamentals with SwiftUI, list-to-detail navigation, API mapping, and state handling.
AppUIKit
Worldline internship learning path: UIKit, networking, custom cells, and list-to-detail navigation.
- Swift
- UIKit
- URLSession
- Jikan API
Demonstrates: Native iOS fundamentals with UIKit, MVC-style structure, networking, and asynchronous image handling.
AppAndroid
Worldline internship learning path: Kotlin, Jetpack Compose, dependency injection, and local persistence.
- Kotlin
- Jetpack Compose
- Material 3
- Navigation Compose
- Koin
- EncryptedSharedPreferences
Demonstrates: Modern Android fundamentals, Compose navigation, ViewModels, dependency injection, and layered UI/domain/data structure.
Case studies
Selected case studies
Professional work shown with public app references only. No confidential implementation details are included.
La Mercè production release
- Context
- Public Flutter app released to production for a major Barcelona cultural event.
- My role
- Mobile developer contributing within delivery workflows and release validation support.
- Stack
- Flutter
- Jenkins
- GitLab
- Jira
- Google Play
- Demonstrates
- Production delivery discipline, release validation, and collaboration on a public app with real users.
Barcelona a la Butxaca air quality
- Context
- Air quality feature work inside a live public app for Barcelona citizens.
- My role
- Mobile developer working on the air quality feature through API integration and product delivery practices.
- Stack
- Flutter
- REST APIs
- Jira
- Google Play
- Demonstrates
- API integration, feature delivery, and maintenance work on a real citizen-facing production app.
Nescafé Dolce Gusto QA validation
- Context
- Structured QA support for a production mobile app connected to coffee machine flows.
- My role
- Manual QA support using Jira, structured test plans, test cases, functional validation, and issue follow-up.
- Stack
- Jira
- Test plans
- Test cases
- Functional validation
- Mobile QA
- Demonstrates
- Product quality mindset, structured manual testing, and reconnection and brew flow validation on a public production app.
Skills
Technical toolbox
Mobile
- Flutter
- Dart
- Android
- Kotlin
- Jetpack Compose
- iOS
- Swift
- SwiftUI
- UIKit
Architecture
- Clean Architecture
- Layered Architecture
- Repository Pattern
- Dependency Injection
- Screaming Architecture
Backend & APIs
- REST APIs
- FastAPI
- Python
- PostgreSQL
- Firebase Auth
- Railway
Delivery & Quality
- GitHub Actions
- Jenkins
- GitLab
- CI/CD
- Google Play
- App Store
- Jira
- QA validation
- Manual QA
- Test plans
- Test cases
- Debugging
- Release validation
Ways of working
- Agile/Scrum
- Code review
- Team coordination
- Cross-functional collaboration
Education
Education and languages
Education
Telecommunications Engineering
Universitat Pompeu Fabra
Master's in AI Development
BIG School · In progress
Languages
- Spanish
- Native
- Catalan
- Native
- English
- B2
Contact
Let’s build great
Available for Flutter / Mobile Developer roles in product teams, especially where production delivery, QA/release validation, and Barcelona hybrid or remote collaboration matter.