Open to opportunities

Michał Barczyk

@michabarczyk

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Cross-platform mobile developer specializing in React Native and Xamarin/.NET MAUI.

Poland

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What I'm looking for

I seek mobile engineering roles building cross-platform apps (React Native / Xamarin/.NET MAUI) with strong backend integration, real-time data, and collaborative agile teams.

I am a cross-platform mobile developer with experience building production-grade mobile applications for finance, courier, and warehouse domains. I design modern UIs and implement robust architectures that support real-time data and reliable device integrations.

At StoneX Financial I developed a React Native trading application, optimized real-time data streaming with RxJS and Lightstreamer, and implemented feature-driven plugin architecture while deploying to App Store and Google Play.

Previously I built courier and warehouse applications using Xamarin and MVVM, integrated with barcode scanners, and implemented backend services with Spring (Spring MVC / WebFlux), JPA, PostgreSQL, and Liquibase in microservice architectures.

I value pragmatic engineering, testable code, and agile collaboration — facilitating Scrum ceremonies, creating Jira tickets, and delivering end-to-end mobile solutions that combine UI, networking, and backend-for-frontend services.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

StoneX Financial LTD Sp. z o.o.

Aug 2023 - Present (2 years 6 months)

Developed a React Native trading application, optimized real-time data streaming using RxJS and Lightstreamer to ensure efficient UI rendering for time-sensitive data, and implemented BFF services exposing REST and gRPC APIs. Deployed mobile apps to App Store and Google Play and facilitated Scrum ceremonies to support agile delivery.

React Native RxJS Lightstreamer BFF gRPC Figma Agile Scrum

Software Developer

InPost Technology S.A.R.L. Sp. z o.o.

Jan 2022 - Jul 2023 (1 year 6 months)

Developed courier and warehouse mobile applications using Xamarin with MVVM and implemented backend services with Spring MVC, JPA and PostgreSQL. Built and maintained microservice-based applications following DDD and hexagonal architecture.

Xamarin MVVM Spring MVC JPA PostgreSQL Liquibase Microservices DDD

Xamarin Developer

Sii Sp. z o.o.

Dec 2019 - Dec 2021 (2 years)

Developed a courier mobile application using Xamarin and MVVM architecture and integrated the app with Datalogic and Zebra barcode scanners to support field operations.

Xamarin MVVM Realm Datalogic Zebra Mobile Integration