Full stack developer · Mobile · Florianópolis, Brazil

Diego Horvatti

I build apps and products end to end: from the React Native and Expo app for iOS and Android to the API, database, tests and store releases.

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Photo of Diego Horvatti
  • +years of professional experience
  • %test coverage, up from 8%
  • −%build and startup time
  • k+users on the app I modernized

About me

I'm a mobile-focused full stack developer with more than 5 years building and modernizing apps, SaaS platforms and data-driven products. I work end to end: from the React Native and Expo app for iOS and Android to API architecture, data modeling, integrations, automated tests, CI/CD and store releases.

I've worked with offline-first apps, data sync, push notifications, deep links and native modules in Kotlin and Swift. I've modernized the app of an omnichannel contact center platform, the app of a field operations SaaS with more than 10,000 users and a sales tracking product that was later acquired.

Projects

ScaleAi

Free workout, diet, water and progress app, published on the App Store and Google Play and used by more than 200 people. Real Brazilian food and everything works offline.

  • Expo
  • React Native
  • Bun
  • oRPC
  • Drizzle
  • PostgreSQL
Visit Private code

Super Novel

Read or listen to light novels and web novels in Portuguese, for free, with a different voice for each character. New chapters every day.

  • Next.js
  • oRPC
  • Drizzle
  • PostgreSQL
  • Web Speech API
Visit Code

Champ

Cattle breeding management: herd, fixed-time insemination, births and semen and medicine stock. The field app works even without signal.

  • Expo
  • React
  • Material UI
  • Bun
  • oRPC
  • PostgreSQL
Visit Private code

Essentia Saúde

Patient app on top of the public FHIR R4 API: filtered search, infinite scroll, clustered map, favorites, offline cache, e2e tests and OTA updates.

  • Expo Router
  • React Native
  • oRPC
  • TanStack Query
  • Maestro
Private code
R

Rigatti

Multi-tenant mini SaaS: companies register products and an AI agent answers customers by querying the real catalog through tool calling, always isolated per company.

  • oRPC
  • Node
  • Express
  • MongoDB
  • Next.js
  • Material UI
Code

Experience

  1. Apr 2026 – presentSão José, SC

    Full Stack Developer (Mobile)

    Novo Horizonte Promotora & Agência Credisa
    • I lead the build of a product ecosystem for banking operations, with a React Native and Expo app and independent Bun, strict TypeScript services in a modular monorepo.
    • Contract-first APIs with oRPC and Zod, typed end to end across backend, shared contracts and the app; screens with biometric authentication, CRM, remarketing and financial integrations.
    • Shared mobile Design System, CI/CD with EAS Build and Docker Swarm, internal builds per pull request, AI agents and automations with WhatsApp, Slack, Meta Ads and n8n.
  2. Jan 2026 – Mar 2026Florianópolis, SC

    Mid-level Mobile Developer

    VTurb
    • Evolved the video player on mobile, the platform's core product, with high traffic on iOS, Android and in-app WebViews.
    • Reusable modules integrated with native playback layers (ExoPlayer and AVPlayer), with HLS/DASH streaming.
    • Optimized TTFF, play rate and buffering on mobile devices, with unit, integration and E2E tests on devices and emulators.
  3. Dec 2024 – Dec 2025Florianópolis, SC

    Mid-level Software Developer (Mobile)

    Dígitro Tecnologia
    • Modernized the NeoInteract app, an omnichannel contact center platform with voice, chat, social media and real-time supervision, restructuring the core with React Native, TypeScript and a mobile Design System.
    • Build pipeline with Hermes and Metro cache (about 90% less build and startup time), Bun for tests (60% faster) and coverage from 8% to 93.5%.
    • Rebuilt the app's largest form, with hundreds of fields, and standardized REST, WebSockets and WebRTC; a release once maintained by five developers is now evolved by two.
  4. Mar 2023 – Dec 2024Videira, SC

    Mid-level Mobile Developer

    Multifoco
    • Modernized the app of a work order and field operations SaaS used by more than 10,000 users, with a new React Native, Expo and TypeScript architecture shipped to the App Store and Google Play.
    • Reusable components, hooks and forms (about 70% less time on some features) and a visual overhaul with an estimated 80% usability improvement.
    • Offline-first modules with sync, camera, GPS, digital signature, QR Code, push notifications, RBAC, multi-company and five languages.
  5. Jan 2022 – Mar 2023São Paulo, SP

    Mid-level Full Stack Developer (Mobile)

    Xflow Media
    • On SiriusTrack from day one, a UTM tracking and sales attribution SaaS later acquired by Greenn Company: React Native app and Node.js and Express APIs.
    • GraphQL integrations with Meta and webhooks from 7 sales platforms; adopting ClickHouse removed about 90% of the PostgreSQL load.
    • Charts, advanced filters and AI features that cut data cross-referencing effort by about 60%.

Education

  • Specialization in Data Science and Artificial Intelligence
    Lisbon Data Science Academy
    Dec 2025 – Jan 2027 · in progress
  • B.Sc. in Computer Science
    Instituto Federal Catarinense (IFC)
    Mar 2022 – Nov 2027 · in progress

Certifications

  • 24th Brazilian Olympiad in Informatics, Senior Programming Level
    OBI, 2022
  • Meta Front-End Developer
    Meta, 2026
  • Azure & DevOps Fundamentals
    Microsoft Learn, 2026
  • Cyber Threat Intelligence Fundamentals
    Tempest Security Intelligence, 2026

Other activities

  • The Developer's Conference (TDC)
    Production Organizer: logistics, coordination and attendee experience
    2023 – present
  • Olimpíada Brasileira de Informática (OBI)
    Academic Support Monitor: helping students with logic and programming
    2022 – 2024

Languages

  • Portuguese: native
  • English: intermediate, technical reading and professional communication

Stack

  • Languages
    • TypeScript
    • JavaScript
    • Python
    • SQL
    • Kotlin
    • Swift
  • Mobile
    • React Native
    • Expo
    • EAS Build/Update
    • React Navigation
    • Reanimated
    • Hermes
    • Native modules
    • Push (FCM/APNs)
    • Deep links
    • Offline-first
    • MMKV
    • App Store/Google Play
  • Web frontend
    • React
    • Next.js
    • Vite
    • Material UI
    • Redux Toolkit
    • React Hook Form
    • Web Components
    • Lit
  • Backend & APIs
    • Node.js
    • Bun
    • Express
    • oRPC
    • tRPC
    • GraphQL
    • Zod
    • WebSockets
    • JWT
    • RBAC
  • Data
    • PostgreSQL
    • MongoDB
    • Redis
    • ClickHouse
    • SQLite
    • Drizzle ORM
  • Testing & DevOps
    • Vitest
    • Jest
    • Testing Library
    • Detox
    • Maestro
    • Fastlane
    • Docker
    • Docker Swarm
    • GitLab CI/CD
    • Vercel
  • Architecture
    • SOLID
    • Clean Architecture
    • Design System
    • Monorepo
    • Modular monolith
    • Event-driven
    • Multi-tenant
  • AI & automation
    • AI agents
    • Local LLMs
    • n8n
    • WhatsApp
    • Slack