OPEN TO REMOTE OPPORTUNITIES

Engineering experience you can hire.

/ FLUTTER · DART · MOBILE ARCHITECTURE

AVAILABLE FOR CONVERSATIONS

SENIOR FLUTTER DEVELOPER / FLUTTER ENGINEER

Daves Balthazar.

Senior Flutter Developer & Flutter Engineer

I build production-grade Flutter applications with Dart, Clean Architecture, BLoC/Cubit and Riverpod — including digital banking, Pix, card features, native integrations, performance and reliable iOS/Android releases.

São Paulo, Brazil Remote · LATAM / International+55 (11) 99282-5958

LinkedIn Profile WhatsApp

Years building
with Flutter & Dart

20+

Years across
software engineering

52K+

YouTube community
subscribers

500+

Flutter & Dart
technical videos

01 / PROFILE

About me

I'm a hands-on Senior Flutter Engineer with experience delivering complex applications for international teams. My day-to-day spans Flutter/Dart implementation, Clean Architecture, BLoC/Cubit, Riverpod, native integrations and reliable releases on iOS and Android.

My projects also cover digital banking, Pix, card payment experiences, fintech and benefits products. I also bring two decades of broader software engineering experience. I enjoy turning product requirements into maintainable systems, improving performance and taking ownership from technical discovery to production delivery.

Hands-on Flutter engineeringMobile architectureBanking · Pix · CardsCode reviews & mentoringRemote collaboration

02 / EXPERIENCE

Flutter experience.

PROJECT HIGHLIGHTS · FLUTTER & FINTECH

Selected real-world work, grouped by engineering focus and product domain rather than employer or overlapping job dates. Client and employer names are intentionally omitted.

◈

ENTERPRISE PLATFORMS + AI

Senior Flutter Engineer · Enterprise Apps

Owned mobile architecture and delivery for complex international platforms, working hands-on with Flutter while coordinating technical decisions across distributed teams.

Flutter and Dart for production iOS and Android applications
BLoC/Cubit, reusable UI components, navigation and API integration
Authentication flows, automated tests and CI/CD release pipelines
Code reviews, technical documentation, mentoring and production troubleshooting

FlutterDartBLoC / CubitREST APIsCI/CD

▤

BANKING · PIX · CARD PAYMENTS

Senior Flutter Engineer · Digital Banking & Payments

Experience building financial-services mobile products, including digital banking experiences, Pix payment journeys and card-related features.

Pix and banking user journeys in mobile applications
Credit-card and payment-related product experiences
Integration with financial APIs, authentication and business rules
Attention to data validation, clear transaction feedback and maintainable Flutter code

BankingPixCardsPaymentsFinancial APIs

⌘

FLUTTER MODERNIZATION

Senior Flutter Engineer · App Refactoring

Refactored an established production application to improve architecture, separation of concerns and testability without losing delivery momentum.

Riverpod state management and feature-level architecture
Clean Architecture, SOLID, TDD and pragmatic code quality
Reusable components, dependency boundaries and maintainable modules

RiverpodRefactoringClean ArchitectureTDD

⌂

REAL ESTATE TECHNOLOGY

Senior Flutter Engineer · Mobile & Web

Developed Flutter mobile and web experiences for a real-estate technology platform serving a network of more than 600,000 agents.

BLoC, Clean Architecture and reusable feature modules
Unit and widget tests to support reliable feature delivery
Collaboration with product, design and backend teams

Flutter WebBLoCUnit TestingWidget Testing

◇

FLEET · VEHICLE CONNECTIVITY

Senior Flutter Engineer · Telematics & Fleet Apps

Built connected-vehicle experiences combining Flutter interfaces with device connectivity, location services and real-time monitoring.

BLE/Bluetooth device communication and native integrations
Geolocation, geofencing and vehicle monitoring workflows
GSM/satellite-related integrations and release coordination
Google Play and Apple App Store publishing workflows

BLEGeofencingNative IntegrationiOS / Android

↗

LOGISTICS · DELIVERY

Senior Flutter Developer · Location-Based Products

Delivered mobile logistics features for delivery-management workflows requiring accurate location awareness and reliable service integration.

Geolocation and geofencing in production mobile flows
Route calculation and map-based application features
Backend service integration and technical team coordination

MapsGeolocationRoutesREST APIs

✳

CREATOR TOOLS · AI FEATURES

Senior Flutter Developer · Creator Applications

Developed creator-oriented mobile and web applications with Flutter and Firebase, connecting polished UI to AI-assisted workflows.

Prompt and script generation features
Teleprompter and in-app video recording experiences
Flutter/Firebase integration for mobile and web use cases

FlutterFirebaseAI IntegrationMedia Features

▧

SALES PRODUCTIVITY · DATA

Senior Flutter Developer · Cross-Platform Tools

Helped establish mobile and web foundations for professional productivity tools with native-device integration and structured data workflows.

Native contact-list access and mobile permissions
Data organization, local caching and API-backed features
Agile collaboration across cross-functional delivery teams

Native APIsData CachingFlutter WebAgile

▥

FINANCIAL SERVICES · BENEFITS

Senior Flutter Engineer · Multi-Product Engineering

Led engineering work across finance, employee benefits, healthcare, cryptocurrency, credit-card and other digital-service applications.

Flutter technical standards and architecture across multiple products
Unit, widget and integration testing practices
Code review, mentoring and consistent delivery quality
Cross-functional coordination for products with different business rules

FintechBenefitsHealthcareTestingLeadership

◉

MOBILE PERFORMANCE · ENGINEERING LEADERSHIP

Senior Flutter Engineer · App Performance

Combined hands-on Flutter architecture with engineering leadership, maintainability improvements and close collaboration with UX/UI teams.

State management with BLoC, Provider, MobX and Riverpod
Application performance improvements, including a 60% loading-time reduction in a prior engagement
Developer mentoring, code quality and scalable mobile patterns

OptimizationMentoringApp ArchitectureFlutter

Earlier leadership experience

Senior engineering management, CTO responsibilities, mobile and full-stack delivery across digital products and cross-functional teams since 2001.

03 / EXPERTISE

Technical toolkit.

A broader view of the Flutter, fintech, mobile and leadership capabilities I bring to production teams.

Flutter & Dart

Flutter / DartBLoC / CubitRiverpodProvider · GetX · MobXGoRouterDio · RetrofitFreezed · code generationFirebaseFlutter Web / DesktopReusable UI components

Architecture & performance

Clean ArchitectureSOLID · Clean CodeMVVM / MVCTDDDependency injectionFeature modularizationDesign systemsOffline cachingPerformance profilingLegacy app refactoring

Banking & payments

Digital banking appsPix experiencesCard product featuresPayment integrationsFinancial-services APIsTransaction state & feedbackAuthentication & onboardingData validationBenefits / financial products

Mobile & native integrations

iOS / AndroidSwift · KotlinRESTful APIs · GraphQLBLE / BluetoothNFCGeolocation · geofencingMaps & routingDevice permissionsFirebase servicesWeb and desktop delivery

Testing & release quality

Unit testingWidget testingIntegration testingAutomated testing strategyGit · GitHubGitLab / BitbucketCI/CD pipelinesFirebase CrashlyticsProduction debuggingApp Store / Google Play

Production delivery & collaboration

Flutter engineering ownershipArchitecture decisionsCode reviewsMentoring developersAgile / ScrumCross-functional deliveryTechnical documentationAPI contractsInternational remote teamsProduct-to-production ownership

04 / HOW I WORK

Beyond the code.

Architect for change

Clear boundaries, reusable components and pragmatic patterns that help software evolve as products grow.

Ship with confidence

Automated tests, CI/CD, code reviews and careful release workflows across mobile platforms.

Lead by building

Mentoring, technical decisions and hands-on delivery alongside product, design and engineering teams.

YOUR NEXT FLUTTER ENGINEER

Let's build your next
great mobile product.

Looking for a Senior Flutter Developer or Flutter Engineer? I'd be glad to hear about your team and what you're building.