MOBILE APPLICATION ENGINEERING — IOS / ANDROID
{ iOS + Android }
DESIGN → CODE → RELEASE
AVAILABLE FOR CONVERSATIONS
SENIOR MOBILE SOFTWARE ENGINEER / IOS & ANDROID
Daves Balthazar.
Senior Mobile Software Engineer · iOS & Android
I engineer production-ready mobile applications across iOS and Android, combining Flutter/Dart with native Swift/Kotlin integrations, mobile architecture, testing and reliable delivery. My projects span banking, Pix, cards, BLE, location services and consumer apps.
8+Years delivering
Flutter mobile apps
2Major mobile
app platforms
500+Flutter & Dart
technical videos
01 / PROFILE
About me
I'm a Senior Mobile Software Engineer experienced in cross-platform and native-integrated application delivery for iOS and Android. I work with Flutter/Dart, Swift and Kotlin alongside modern architecture, state management, automated testing and app-store release workflows.
My mobile projects include digital banking, Pix, cards, identity verification, Bluetooth-connected vehicles, geofencing, logistics, media tools and API-integrated applications. I enjoy hands-on engineering, performance tuning and building features that behave reliably on real devices.
iOS & AndroidFlutter · Swift · KotlinBLE & native SDKsBanking · Pix · CardsRelease engineering
02 / EXPERIENCE
Mobile software projects.
IOS · ANDROID · FLUTTER · NATIVESelected real-world work, grouped by engineering focus and product domain rather than employer or overlapping job dates. Client and employer names are intentionally omitted.
◈
IOS · ANDROID · CROSS-PLATFORM
Senior Mobile Software Engineer · Production Apps
Hands-on development of consumer and enterprise mobile software, connecting product requirements to reliable Android and iOS experiences.
- Flutter/Dart implementation, reusable components and app navigation
- Native platform awareness using Swift, Kotlin and device integrations
- API-backed features, authentication and troubleshooting across releases
iOSAndroidFlutterDartSwift / Kotlin
▣
BANKING · PIX · CARD PRODUCTS
Mobile Banking & Payment Experiences
Mobile engineering for financial products including banking, Pix, QR code and card-related flows.
- Pix and automatic/recurring Pix experiences
- Card modules, transactions and payment-related user journeys
- Financial API integration, authentication and verification SDKs
Digital bankingPixCardsQR CodeFintech
◇
CONNECTED DEVICES · BLUETOOTH
BLE & Device-Connected Mobile Applications
Mobile features for connected vehicles, using device communication and location-aware interfaces.
- BLE/Bluetooth communication and native-device integration
- Real-time vehicle monitoring and telematics-related workflows
- Mobile features linked to GSM/satellite-associated systems
BLE / BluetoothMobile sensorsDevice APIsVehicle data
⌖
MAPS · GEOLOCATION · DELIVERY
Location-Based Mobile Engineering
Developed logistics and fleet-oriented mobile experiences driven by maps, routes and geographic context.
- Geolocation, geofencing and permission flows
- Map-based interfaces and route calculation
- Integration with remote services for delivery and fleet operations
GeolocationGeofencingMapsRoutingPermissions
▥
ARCHITECTURE · MODERNIZATION
Mobile Architecture & App Refactoring
Helped establish maintainable mobile foundations and modernize production applications.
- Clean Architecture, BLoC/Cubit, Riverpod and reusable UI patterns
- App refactoring, modularization and dependency separation
- Unit, widget and integration tests to protect release quality
Clean ArchitectureBLoC / CubitRiverpodTDD
▧
IDENTITY · NATIVE MOBILE SDK
Authentication, Identity & Device APIs
Implemented mobile onboarding and device-level capabilities that require careful integration with platform SDKs.
- Integration and replacement of facial recognition / identity verification SDKs
- Native contact-list access and permissions
- Authentication, secure local storage and API-backed user flows
Identity verificationNative SDKsMobile permissionsAuthentication
✳
CREATOR PRODUCTS · MEDIA
Consumer Mobile Apps & Media Features
Built mobile creator features and consumer-facing app workflows combining cross-platform UI and platform services.
- Teleprompter and video-recording app features
- AI-assisted script-generation screens and Firebase-backed flows
- User-friendly interfaces and coordination with UX/UI specialists
Media appsFlutterFirebaseVideo features
↗
RELEASES · CI/CD · APP STORES
Mobile Testing & Release Delivery
Worked across development, quality and distribution for app products deployed on iOS and Android.
- App Store and Google Play publishing and maintenance workflows
- CI/CD, code review and release troubleshooting
- Improved mobile loading performance by 60% in a prior engagement
Google PlayApp StoreCI/CDPerformance
⌘
MOBILE & WEB PRODUCT ECOSYSTEMS
Connected Cross-Platform Product Delivery
Supported applications spanning phone, web and desktop while coordinating data models and service integration.
- Flutter mobile / web interfaces and shared components
- REST, GraphQL and Firebase-backed integrations
- Local caching, design systems and cross-team technical delivery
Flutter WebREST / GraphQLCachingDesign systems
03 / EXPERTISE
Technical toolkit.
iOS, Android and cross-platform engineering skills, from architecture and native device integration to mobile QA and production releases.
01
Mobile platforms & languages
iOS / AndroidFlutter / DartSwiftKotlinReact Native experienceMobile SDK integrationFlutter WebFlutter DesktopCross-platform UIResponsive mobile design
02
State management & architecture
BLoC / CubitRiverpodProviderGetX · MobXClean ArchitectureMVVM / MVCSOLIDDependency injectionReusable componentsLegacy modernization
03
Native integrations
BLE / BluetoothNFCGeolocationGeofencingMaps & routingIdentity-verification SDKsNative contactsDevice permissionsNotificationsLocal secure storage
04
Banking & payments
Digital bankingPixAutomatic PixQR-code paymentsCards & paymentsFinancial APIsUser onboardingTransaction experiencesAuthenticationData validation
05
Mobile quality & delivery
Unit testingWidget testingIntegration testingTDDGitCI/CDCrashlyticsPerformance profilingGoogle Play releasesApp Store releases
06
Cloud, APIs & teamwork
Firebase / FirestoreREST / GraphQLDio · RetrofitFreezedCachingSQL / NoSQLThird-party APIsRemote distributed teamsCode reviewsTechnical documentation
04 / HOW I WORK
Beyond the code.
01Design for real devices
Account for platform behavior, device permissions, connectivity and performance as part of the product.
02Ship stable releases
Test on mobile, integrate backend services and manage reproducible publishing workflows.
03Bridge mobile and backend
Combine user-facing apps with APIs, security-sensitive flows and device capabilities.
Let's ship great iOS & Android apps.
Hiring a Senior Mobile Software Engineer for iOS, Android, Flutter or mobile architecture? Let’s talk about your team and product.