I’m looking for a remote mobile development role where I can build and improve real products, ship meaningful features and contribute to technical decisions. I’m especially interested in Flutter and cross-platform mobile projects, with a strong focus on code quality, performance and user experience.
Looking for a job
Sergio Velhinho
@sergiovelhinho
Mobile Developer specialized in Flutter, building production-ready iOS & Android apps.
FranceWhat I'm looking for
Mobile developer specialized in Flutter, with 6+ years of experience building, maintaining and improving production applications across iOS and Android.
I have worked on products in health, wellness, social networking and print-on-demand, covering the full mobile development lifecycle: architecture, feature development, REST API integration, state management, performance optimization, debugging, maintenance and App Store / Google Play releases.
Recent projects include Kojo, a health and nutrition app backed by AWS services; Eira, a wellness and productivity app built with Flutter and Riverpod; and Profiler, a social mobile app with swipe-based interactions, statistics and community features.
My main stack includes Flutter, Dart, iOS, Android, REST APIs, Firebase, AWS, Riverpod, Provider, GetX and Git.
I am looking for remote Mobile / Flutter opportunities where I can contribute to an existing product, ship new features and help improve architecture, performance and user experience.
Experience
Work history, roles, and key accomplishments
EP
Current
Mobile App Developer
EpicStarz
Jan 2026 - Present (7 months)
Built and evolved a wellness and productivity mobile app for iOS and Android using Flutter, Riverpod and Provider. Worked on onboarding, UI/UX, new features, bug fixing, maintenance and store releases.
Integration TestingDartDebuggingCursorUser Experience (UX)app storeUI DesignGitProduct DevelopmentFlutteriOSState ManagementProblem SolvingPrompt EngineeringUnit TestingClean ArchitecturePerformance OptimizationGenerative AIFastlaneSoftware DevelopmentSoftware TestingProviderAndroidSoftware Architecture
ID
Mobile App Developer
Ikigai Development
Jan 2025 - Dec 2025 (11 months)
Developed and maintained a production health and nutrition app for iOS and Android. Built meal tracking features, integrated AWS services and REST APIs, improved performance and contributed to the app architecture and user experience.
AWS LambdaIntegration TestingAuthenticationCloud StorageAmazon CognitoFirebaseDebuggingCursorUser Experience (UX)app storeGitProduct DevelopmentFlutteriOSState ManagementProblem SolvingPrompt EngineeringUnit TestingPerformance OptimizationAmazon API GatewayGenerative AIFastlaneSoftware DevelopmentSoftware TestingProviderAndroidREST APIsSoftware ArchitectureAWSGetXS3API Integration
PL
Mobile App Developer
Profiler LLC
Jan 2024 - Dec 2024 (11 months)
Developed a social mobile app with swipe-based interactions, profile management, statistics and community features. Worked on UI, animations, state management, backend integrations, maintenance and feature development.
AWS LambdaIntegration TestingAuthenticationCloud StorageAmazon CognitoDartFirebaseDebuggingUser Experience (UX)app storeGitProduct DevelopmentFlutteriOSState ManagementProblem SolvingUnit TestingPerformance OptimizationAmazon API GatewayFastlaneSoftware DevelopmentSoftware TestingProviderAndroidREST APIsSoftware ArchitectureAWSGetXS3API Integration
PR
Mobile Developer & Co-founder
Printisk
Jun 2020 - Dec 2023 (3 years 6 months)
Co-founded and developed a print-on-demand platform with Flutter across mobile and desktop. Built core product features, QR code workflows and cross-platform interfaces while contributing to technical and product decisions.
AWS LambdaIntegration TestingAuthenticationCloud StorageAmazon CognitoDartFirebaseDebuggingUser Experience (UX)app storeGitProduct DevelopmentFlutteriOSState ManagementProblem SolvingUnit TestingPerformance OptimizationAmazon API GatewaySoftware DevelopmentSoftware TestingProviderAndroidREST APIsSoftware ArchitectureAPI Integration
Flutter/Unity/Unreal Engine Developer
Art Graphique & Patrimoine
Aug 2020 - Jan 2022 (1 year 5 months)
Developed interactive applications and immersive experiences for museums and public institutions using Flutter, Unity and Unreal Engine. Worked on mobile, VR and custom interactive projects for different client environments.
2D & 3D Developer
FDJ Gaming Solutions France
Mar 2019 - Aug 2020 (1 year 5 months)
Developed online games and interactive applications for Française des Jeux and international lottery operators. Implemented features, interfaces and gameplay elements while contributing to production projects within a development team.
Unity / Unreal Engine Developer
Optimareality
Jan 2018 - Mar 2019 (1 year 2 months)
Worked on R&D projects for immersive and multiplayer VR experiences. Developed prototypes, gameplay systems and interactive features using Unity and Unreal Engine across 2D and 3D environments.
C++ Developer
Eversim
Aug 2016 - Mar 2017 (7 months)
Developed gameplay features for political simulation games in C++. Implemented and improved existing systems, fixed bugs and contributed to the evolution of simulation and gameplay mechanics.
Education
Degrees, certifications, and relevant coursework
42 Paris
Software Development,
2015 - 2019
Grade:
Activities and societies:
Project-based computer science training focused on autonomy, problem solving and peer-to-peer learning.
Intensive curriculum covering algorithms, systems programming, software architecture and collaborative development through real-world projects, without traditional lectures or instructors.
Tech stack
Software and tools used professionally
Availability
Looking for a job
Location
France
PortugalSalary expectations
55k-75k USD
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