ChamaFácil
Full-stack delivery dispatch platform with real-time driver tracking, push notifications and job queues — mobile app, web dashboard and a high-throughput backend.
FlutterReactNode.jsPostgreSQLRedisWebSocketFCM
A developer who ships
I'm a Senior Flutter & Fullstack Developer with 8+ years in software development, the last 4 specialized in production mobile apps for Android, iOS and Web. I focus on offline-first architecture, Clean Architecture / MVVM and clean, well-tested Dart codebases (TDD, golden tests, CI/CD on Azure DevOps).
Beyond Flutter, I build complete backends with Node.js, PostgreSQL and Firebase — REST APIs, real-time WebSocket systems and React dashboards. I integrate AI / LLM APIs into real products and collaborate with international teams (EN / PT / ES).
Where I've worked
ForLogic
Senior Flutter Engineer
Nov 2024 – present
Own the Flutter layer of MetroEx (industrial metrology / ISO 17025): offline-first sync, local calculation and an offline audit trail (→ Mixpanel) for field data integrity. Drove architecture refactors and QA semantics; ~30% more test coverage, 99%+ crash-free, Azure DevOps CI/CD.
FlutterOffline FirstClean ArchitectureAzure DevOps
Designed and shipped a multi-app delivery dispatch platform end-to-end: Flutter driver app (+ iOS PWA), React admin/store panels, Fastify API, live GPS via WebSocket, Mercado Pago settlements, plus an AI WhatsApp sales agent and self-service checkout. CI/CD on Cloudflare Workers.
FlutterNode.jsFirebaseAICloudflare
ATS Informática
Software Developer
2017 – 2024
Built Flutter interfaces serving 5,000+ users with focus on performance and UX. Managed state with MobX and modularized project architecture. Automated testing and CI/CD via Azure DevOps, reducing deploy time by ~50%. Delivered full-stack business software and ERP modules.
FlutterMobXFull StackREST APIsAzure DevOps
What I've been shipping
A living, filterable log of production work — ~weekly. Public products named; private clients and adult apps anonymized as technical craft.
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Selected work
Real, shipped products — from offline-first enterprise apps to full-stack platforms.
Welcoming
Mobile app published on the Play Store, built with Flutter for a smooth and responsive Android experience with clean state management and modern UI.
FlutterDartFirebase
PM-PE
Mobile app for the Polícia Militar de Pernambuco — field tools for officers with offline-first data capture, real-time sync and a clean Flutter interface built for high-reliability environments.
FlutterDartOffline-FirstGovernment
e-gage
Contributed to e-gage's Flutter mobile app — an all-in-one platform to engage, train and communicate with frontline employees, serving enterprise clients across Brazil.
FlutterDartEnterpriseB2B
Ficar Limpo
Consumer mobile app published on the Play Store, focused on a smooth, responsive Flutter UI and clean state management.
FlutterDartREST API
ReciboAI
AI-powered receipt & document generator with a freemium model — built end-to-end, from landing page to LLM integration and billing.
FlutterClaude APIAISaaS
Tech stack
⚔ Core
- Flutter
- Dart
- Mobile Architecture
- State Management
- MobX
- Provider
🛡 Architecture
- Offline-First
- Clean Architecture
- MVVM
- TDD
- Golden Tests
🔥 Backend & Cloud
- Node.js
- PostgreSQL
- PostGIS
- Firebase
- REST APIs
- WebSocket
- Redis
- CI/CD
🔐 Security
- Firestore Security Rules
- Rules hardening
- Wallet / admin lockdown
- Secrets & auth baselines
- Age verification gates
- Emulator rule suites
🗺 Geo & Edge
- Geolocation / geofencing
- PostGIS queries
- Drone telemetry
- On-device YOLO / NCNN
- Presence / heartbeat APIs
- Maps & Places
🌐 Web & Extras
- React
- TypeScript
- AI Integration
- LLM APIs
- Azure DevOps
- Git
- FCM
Phrases that drive me
"Make it work, make it right, make it fast."
— Kent Beck"Simplicity is the ultimate sophistication."
— Leonardo da Vinci"First, solve the problem. Then, write the code."
— John Johnson"What is truly worthy is worth the effort."
— Santa Teresa of Ávila
Common questions
Are you available for freelance or remote Flutter work?
I'm employed full-time and selective — not hunting. For the right scope, role or consulting engagement, just get in touch.
Are you a fullstack developer or only Flutter?
Both. Flutter is my specialty, but I build complete systems: Node.js backends, PostgreSQL databases, Redis queues, WebSocket real-time layers and React web dashboards. I deliver the full product, not just the app.
What platforms do you target?
iOS, Android and Flutter Web — all from a single codebase. I have apps published on the App Store and Play Store.
What is your tech stack?
Mobile: Flutter, Dart, MobX, TDD, Clean Architecture. Security: Firestore rules hardening, wallet/admin lockdown, age-verification gates. Geo: PostGIS, geofencing, drone telemetry, on-device YOLO/NCNN. Backend: Node.js, PostgreSQL, Firebase, Redis, WebSocket. Web: React, TypeScript. AI: Claude API. DevOps: Azure DevOps / Cloudflare CI/CD.
Do you do Firebase / information security work?
Yes. I have shipped production Firestore security-rule hardennings: fixed a root catch-all that OR'd with every rule and voided locks, locked wallets/admins/audit from clients, accountStatus anti-abuse whitelists, closed notification rules, and third-party age-verification gates — with emulator regression suites. Living log: #shipped → filter Security.
Do you work with geolocation and drone field systems?
Yes. Recent work includes PostGIS-backed geo feeds, multi-region geofenced dispatch, drone controller screen-mirror with on-device YOLO/NCNN detection, GPS/heading/gimbal telemetry fusion for geo-target estimates, and a Workers presence API for field units. See #shipped → filter Geo.
How can I contact you?
Email: [email protected] · LinkedIn: linkedin.com/in/diego-emanuel/ · WhatsApp — I usually reply within a day.
What timezone are you in? Can you work with US/EU teams?
I'm based in Brazil (UTC-3). That gives 4–6 hours of overlap with US Eastern time and a full afternoon overlap with Central European time. I work async-first and communicate in English, Portuguese and Spanish.
Ways we can work
Employed full-time and running Falcão Digital — I don't take everything that shows up. When the fit is real, these shapes work: a remote role, a defined freelance scope, or short consulting. Flutter/Dart on mobile, plus the backend and web around it. Brazil (UTC-3), English with US and EU teams.
Full-time remote
Join a team as a senior Flutter or fullstack engineer on US or EU hours. Async-first, English-speaking, 4–6h overlap with US Eastern and a full afternoon with CET.
FlutterDartNode.jsReact
Defined freelance work
End-to-end Flutter delivery — architecture, build, App Store and Play Store — or a clear slice inside an existing codebase.
MVPApp StorePlay StoreOffline-First
Consulting & code review
Short engagements for teams already on Flutter: offline-first, Clean Architecture / MVVM, test coverage and CI/CD.
ArchitectureTDDCI/CDCode Review
Get in touch →
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Get in touch
Saw something that resonates? Send a message — no pitch deck required. I usually reply within a day.
📍 Brazil (UTC-3) · 4–6h overlap with US Eastern · Full afternoon with CET · Async-ready, English OK.
Selective · get in touch