09/25/2026 updated
100 % available
Senior AI Mobile App Developer | React Native, Flutter/Firebase | Real-Time Apps
Warszawa, Poland
Only remote
Master of ScienceAbout me
Senior Mobile App Developer with 9+ years shipping production apps in React Native, Flutter, and Firebase - with a deep focus on real-time features that have to feel instant and stay stable at scale.
SupabaseFlutterC (Programming Language)Java (Programming Language)Android (Software)IOS ApplicationsApple IOSMobile Application DevelopmentPython (Programming Language)Rapid Application DevelopmentSwift (Programming Language)Google FirebaseKotlinStripeDart
React Native & Flutter Development
Over 9 years of experience shipping production mobile apps using React Native and Flutter, covering fintech, logistics, health, e-commerce, and on-demand services for both iOS and Android platforms.
Firebase & Real-Time Architecture
Deep expertise in Firebase Realtime Database, Firestore, WebSockets, and offline-first architecture, enabling real-time features such as live chat, tracking, dashboards, and notification streams at production scale.
Mobile App Architecture & Code Review
Strong background in architecture decisions, code review, and mentoring junior developers, including rebuilding sync layers and optimizing delivery-tracking apps to significantly reduce support tickets.
CI/CD & Automated Release Pipelines
Experience shipping on fixed two-week release trains with automated CI/CD pipelines, ensuring stable and predictable app delivery cycles.
App Store Deployment & Post-Launch Support
Hands-on experience with App Store and Google Play review cycles, post-launch crash triage, and ramping onto unfamiliar codebases quickly for app rescue scenarios.
Cloud & AWS
AWS Certified Developer with practical knowledge of cloud infrastructure relevant to mobile backend services and scalable application deployment.
Subscription Billing & Payments
Implementation of subscription billing and payment flows within mobile applications, including integration with e-commerce and fintech platforms.
IoT & Real-Time Tracking
Experience building real-time tracking and IoT-connected features within mobile applications, focusing on stability and instant data synchronization at scale.
Over 9 years of experience shipping production mobile apps using React Native and Flutter, covering fintech, logistics, health, e-commerce, and on-demand services for both iOS and Android platforms.
Firebase & Real-Time Architecture
Deep expertise in Firebase Realtime Database, Firestore, WebSockets, and offline-first architecture, enabling real-time features such as live chat, tracking, dashboards, and notification streams at production scale.
Mobile App Architecture & Code Review
Strong background in architecture decisions, code review, and mentoring junior developers, including rebuilding sync layers and optimizing delivery-tracking apps to significantly reduce support tickets.
CI/CD & Automated Release Pipelines
Experience shipping on fixed two-week release trains with automated CI/CD pipelines, ensuring stable and predictable app delivery cycles.
App Store Deployment & Post-Launch Support
Hands-on experience with App Store and Google Play review cycles, post-launch crash triage, and ramping onto unfamiliar codebases quickly for app rescue scenarios.
Cloud & AWS
AWS Certified Developer with practical knowledge of cloud infrastructure relevant to mobile backend services and scalable application deployment.
Subscription Billing & Payments
Implementation of subscription billing and payment flows within mobile applications, including integration with e-commerce and fintech platforms.
IoT & Real-Time Tracking
Experience building real-time tracking and IoT-connected features within mobile applications, focusing on stability and instant data synchronization at scale.
Experience
Professional experience5 - 10 years
Freelancer since2018
Languages
EnglishNative speakerPolishNative speaker
Project history
Owned mobile delivery for two US client squads inside this approximately 500-person Argentine software company. Led React Native and Flutter builds for fintech and logistics clients, including architecture decisions, code review, and mentoring two junior developers. Rebuilt a lagging delivery-tracking app sync layer using Firestore listeners and offline queue, cutting support tickets by roughly half. Ran sprint planning and demos directly with US stakeholders in English across a 1-hour timezone offset.
Contract-to-product agency work at a well-regarded Argentine mobile studio. Shipped four client apps to both stores covering health, e-commerce, and on-demand services, mostly React Native with Firebase backends. Worked embedded with designers and PMs from discovery through launch, including App Store review cycles and post-launch crash triage. Learned to ramp onto unfamiliar codebases fast, which is the foundation of app rescue work.
Joined the product team at this e-commerce analytics company. Built and maintained the seller-alerts mobile app used by Mercado Libre sellers across LATAM, featuring real-time notification streams, metrics dashboards, and subscription billing. First deep dive into Firebase at production scale with millions of alert events per month, plus shipping on a fixed two-week release train with automated CI/CD.
Certificates
Azure Developer Associate
Microsoft2025
IBM AI Engineering Professional Certificate
IBM2025
Firebase in a Weekend
Google2025
Flutter & Clean Architecture Mastery
Academind / Maximilian Schwarzmüller2024
Flutter & Dart – The Complete Guide
Udemy2023