Freelancer profile translated to English.

Description

Senior software engineer with 8+ years of experience and 6+ years developing Flutter in production for iOS and Android. Main focus: Flutter app development and migrations, scalable mobile architecture, and AI-first development with Claude Code and Cursor daily.

Results: last hybrid migration → Flutter as a senior IC delivered a measured ~60% performance improvement. Apps published on the App Store and Google Play at consumer scale, with experience in fintech products for millions of users (UnDosTres in Mexico: payments, wallet, recharges).

Main Stack:

- Mobile: Flutter, Dart, BLoC/Riverpod/Provider, Clean Architecture, BLE, push notifications (FCM/APNs), deep links, Firebase (Auth, Crashlytics, Messaging, Remote Config, Analytics).

- Backend: Node.js/TypeScript (NestJS, Express) and Python (Django, FastAPI). PostgreSQL.

- Cloud & DevOps: AWS, GCP, Docker, CI/CD with GitHub Actions, GitLab, Codemagic, Fastlane.

- Native (migrations and platform channels): Swift and Kotlin.

- AI: LLM integration, RAG and agentic workflows in product. Claude Code and Cursor daily in development.

Sectors with production products: fintech/payments (UnDosTres), telco/e-SIM (AsiaFlare), IoT/sustainability (Imagined Earth).

Services:

- End-to-end Flutter development, from architecture to release.

- Native/hybrid -> Flutter migrations with a focus on performance.

- Mobile architecture audits, senior code review, and team mentoring.

- Technical consulting in Flutter + Node/Python + AI tooling stacks.

Logistics:

- 100% remote from Madrid. Digital nomad visa: I invoice B2B via freelancer to entities outside Spain (EU, UK, USA, LATAM).

- Spanish and English fluency. Occasional travel OK.

- Reference rate: 300-350 EUR/day, adjustable by scope.

If you have a Flutter project, a pending migration, or a product where mobile is strategic, let's talk. We'll start with a short call to understand the context.

Languages

Spanish
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Madrid (up to 50km)

Ruvik Group
Senior Flutter Developer
SOCIAL NETWORKS
July 2024 - Today (1 year and 11 months)
Madrid, Spain
Launched 2 end-to-end Flutter apps on iOS, Android, and web, with real-time data streams, live updates, push notifications, analytics, and custom animations. Increased user retention by 25% by integrating UI/UX features and A/B testing with Firebase and RevenueCat, and improved app response speed by 30% through performance profiling, frame rendering optimization, memory management, state management optimization, and image compression.

Built and maintained a mobile design system and a reusable component library, collaborating closely with the design team to ensure cross-platform consistency. Implemented platform channels to connect Flutter with native iOS and Android code. Designed the Supabase backend architecture with Row Level Security, Edge Functions, and database modeling.

Accelerated feature delivery with AI-assisted development (Claude Code, Cursor), improving code quality and review cycles. Established a comprehensive testing strategy: unit, widget, integration, and A/B tests.
Flutter Typescript Supabase Firebase Dart
UnDosTres
Senior Flutter Developer
TECH
July 2023 - June 2024 (11 months)
Madrid, Spain
Led the migration of the hybrid app to Flutter, achieving a 60% performance improvement through profiling, frame rendering optimization, and memory management. Reduced customer support requests by 65% by prioritizing and resolving critical bugs.

Delivered features for a high-traffic payment app covering cinema tickets, bus bookings, and mobile recharges, using BLoC (flutter_bloc) for state management. Implemented platform channels to connect Flutter with native iOS and Android code.
Flutter Dart Firebase iOS Android
NuvoEnergy
Senior Software Engineer
ENERGY AND UTILITIES
June 2023 - August 2023 (2 months)
Madrid, Spain
Led the performance and backend architecture rework for an energy data platform. Delivered a 10x measured improvement in PostgreSQL query performance through indexing strategy, execution plan optimization, and schema refactoring on AWS RDS. Automated end-to-end data processing pipelines with triggers, stored functions, and cron jobs in PostgreSQL, eliminating recurring manual operational work.

Migrated the API layer to a clean MVC architecture on Node.js with Express and Apollo Server (GraphQL), improving stability, testability, and team delivery speed. The new GraphQL contract decoupled frontend consumers from PostgreSQL schema changes, reducing coordination friction between releases.
Node.js PostgreSQL AWS Express GraphQL