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Julián Melero HidalgoJM

Julián Melero Hidalgo

Software Engineer (NestJS/Flutter)

€220/day
Valencia, ES
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Julián

I help you launch and maintain products in production (app + backend) with a focus on stability, development speed, and maintainability. I'm a Fullstack (NestJS/Flutter) with +15 years of experience, and I can join a team and contribute from day 1.

What I can do for you
• Flutter: feature development, refactors, performance, and architecture (Clean Architecture, Riverpod, etc.)
• Backend NestJS: REST APIs, auth, integrations, business logic, tests, and migrations.
• PostgreSQL: modeling, queries, optimization, and maintenance.
• Integrations: Firebase (Auth/FCM/Analytics/Crashlytics), subscriptions (RevenueCat), analytics, etc.

My way of working
• Clear deliverables, direct communication, and consistent code.
• I focus on stabilizing (fewer bugs/crashes) and leaving the project easy to evolve.

Stack
Flutter · Dart · TypeScript · NestJS · PostgreSQL · Firebase · Docker · CI/CD
  • Spanish

    Native or bilingual

  • English

    Conversational

  • Catalan

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Softtek
    Flutter Developer
    January 2025 - Today (1 year and 5 months)
    Valencia, Spain
    Flutter Developer — enterprise project (VIP App) for Real Madrid C.F.
    • Development of features and screens in Flutter (iOS/Android).
    • Clean architecture (domain / data / application / presentation).
    • State management and injection with Riverpod (annotated providers) and models with Freezed.
    • Network layer with Dio + Retrofit.
    • Integrations: Firebase (Analytics/Crashlytics/FCM), Adobe AEP, OneTrust, and indigitall.
    • Working with a shared corporate core and reusable components.
    • I focus on stabilizing and maintaining consistent code to make development more agile.

    Stack: Flutter · Dart · Riverpod · Freezed · Dio · Retrofit · Firebase · Adobe AEP · OneTrust · indigitall
    Flutter Clean Architecture Firebase Dart
  • Cuestívate
    Founder, CEO, and Lead Developer
    November 2024 - Today (1 year and 7 months)
    Valencia, Spain
    Founder and Developer — Cuestívate (app for EIR preparation).
    Available on the App Store and Google Play.

    My own project where I manage the product end-to-end: idea, design, development, deployment, and support.
    • Development of the app (Flutter) focusing on UX, performance, and daily habit building (Cuestívate Essential).
    • Backend in NestJS: APIs, auth, data model, migrations, and usage/limit control.
    • PostgreSQL and architecture designed for scaling without escalating costs.
    • AI applied to explanations and mnemonic rules (with limits and metrics for cost control).
    • Infrastructure and deployment + daily monitoring and maintenance.
    • I also handle marketing, support, and bug fixing when needed.

    Stack: Flutter · Dart · TypeScript · NestJS · PostgreSQL · Firebase · RevenueCat · Docker · CI/CD
    Improve. Learn. Succeed.
    Founder and Developer — Cuestívate (app for EIR preparation). Available on the App Store and Google Play. My own project where I manage the product end-to-end: idea, design, development, deployment, and support. • Development of the app (Flutter) focusing on UX, performance, and daily habit building (Cuestívate Essential). • Backend in NestJS: APIs, auth, data model, migrations, and usage/limit control. • PostgreSQL and architecture designed for scaling without escalating costs. • AI applied to explanations and mnemonic rules (with limits and metrics for cost control). • Infrastructure and deployment + daily monitoring and maintenance. • I also handle marketing, support, and bug fixing when needed. Stack: Flutter · Dart · TypeScript · NestJS · PostgreSQL · Firebase · RevenueCat · Docker · CI/CD Improve. Learn. Succeed.
  • Voltereta
    Senior Backend Developer
    September 2022 - October 2024 (2 years and 1 month)
    Valencia, Spain
    As the lead of the backend development team in a growing startup, I played a crucial role in the success of the mobile application. Using cutting-edge technologies and agile methodologies, I achieved significant advancements in the platform's development and performance.

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Education

  • Advanced Vocational Training in Artificial Intelligence and Big Data
    CIPFP MISLATA
    2022
    Máster FP en Inteligencia Artificial y Big Data
  • Higher Technician in Web Application Development, Web computer programming
    UOC X - Xtended Studies
    2019
    Técnico Superior en Desarrollo Aplicaciones Web, Programación informática web

Skill set

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