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Freelance mobile developer

Mobile apps, from idea to App Store.

I'm Giorgio, a freelance React Native developer helping teams ship iOS and Android apps, and the web frontends around them.

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Giorgio Bertolotti, smiling, in a white shirt in front of a hedge
installs of MangaTime, the iOS and Android app I co-founded and build
80K+
shipping React Native apps in production
6+ years
writing software professionally, from embedded to web
Since 2017
for best implementation at the Download Innovation Hackathon
2 awards

Mobile first, with the web covered too.

Most of my work is cross-platform mobile. When your product also needs a dashboard or a back office, I build that too.

Mobile app development

Cross-platform iOS and Android apps with React Native and Expo. One codebase, a native feel, and builds ready for the stores.

  • React Native
  • Expo & EAS
  • TypeScript
  • Push notifications
  • Subscriptions
  • Store release
The MangaTime library screen on an iPhone

Frontend development

React and TypeScript frontends for SaaS back offices, dashboards and internal tools, built on a consistent design system.

MVPs for founders

From rough idea to first release. Having co-founded a product myself, I care about scope, timing and what to leave out.

Upgrades and refactors

Your app works but the codebase is slowing you down? I modernise React Native projects: dependency upgrades, cleaner architecture, shared components.

Selected work

Three MangaTime screens: the To Read list, the reading library with stats, and AI recommendations

Co-founder, mobile development

MangaTime

A manga tracker for iOS and Android with new-chapter alerts, reading stats and home screen widgets. I build and run the app end to end, from code to store releases.

80K+installs worldwide

  • React Native
  • Expo
  • EAS
  • RevenueCat
  • OneSignal
  • Sentry
Visit mangatime.net

Teams I've worked with

Startups, SaaS companies and software houses, as a freelancer, an employee and a co-founder.

  1. Customerly

    2024 - now

    Freelance frontend developer

    I develop the back office frontend that Customerly's customers use to run their customer service.

  2. Fatture in Cloud

    2020 - 2022

    Mobile developer

    Two years on the React Native app: new features, a move to function components, dependency upgrades and a design system shared with a second app.

  3. Boffi Informatica

    2023 - now

    Freelance software developer

    Development and maintenance of C# software for Boffi's clients.

  4. Aretés

    2017 - 2020

    Software developer

    Embedded systems for remote monitoring of fire and intrusion control panels.

  5. Mastranet AI

    2024 - 2025

    Freelance frontend developer

    Frontend for Mira, an AI assistant that helps production-line staff troubleshoot industrial machines.

  6. SuperUrbanity

    2023 - 2024

    Freelance frontend developer

    Built the MVP of ForImpact, a tool for municipalities and companies to track their sustainability actions.

  7. GreenMod

    2022

    Co-founder and CTO

    Co-founded an early-stage building automation startup and led its product development.

How a project runs

Clear steps, early builds on your phone, and no surprises on scope.

  1. Talk

    We start with a call about your product, your users and your deadline. You leave with a clear idea of what is realistic.

  2. Plan

    I turn it into a written plan with milestones and an estimate, so you know what you are paying for before any code is written.

  3. Build

    Work ships in small increments. You get installable test builds early, so feedback happens on a real phone, not in a document.

  4. Launch

    I take care of App Store and Google Play submission, then stay available for fixes, updates and the next version.

About me

I've been writing software since 2017 and building mobile apps since 2020. As co-founder of MangaTime, I've also been the one paying for the app, so I build with your budget and your users in mind.

I'm based near Bergamo, Italy, and work remotely. Away from the keyboard you'll find me on a padel court, or at a table tennis table, where I'm hard to beat.

Education

Recognition

  • Best implementation award

    Download Innovation Hackathon, 2021

  • Best implementation award

    Download Innovation Hackathon, 2020

Have an app in mind?

Send me a few lines about your project and timeline, and I'll get back to you with next steps.

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[email protected]