Bartłomiej Zimny

Experienced React developer who is passionate trully about mobile app development. In my career I would love to gain greater knowledge in software architecture of mobile apps.

Professional Skills

Senior Front-End & Mobile Developer with deep expertise in React and React Native. Fluent in JavaScript and TypeScript, using Redux and MobX for scalable state management. Experienced in CI/CD pipelines, Firebase integrations, and rigorous unit + integration testing. Adept at crafting clear project documentation to ensure maintainable, production-ready code.

React

JavaScript

Redux

CI/CD

unit, integration tests and testing views

React Native

Typescript

Mobx

Firebase

Project documentation

Experience

Senior React Native developer with 7 + years steering mobile projects from architecture to App Store launch. Expert in TypeScript, CI/CD, automated testing, Redux/MobX, and Firebase integrations; valued for mentorship, clear docs, and consistent product improvements.

Senior React Native Developer

apreel

Senior React Native Developer

Odrabiamy.pl/Makalu Media

– creating and monitoring development paths
– helping the team to develop
– helping to create the roadmap
– overseeing development and the software development process
– improving and customising mobile application
– implementing payment gateways
– redesigning of the application
– publishing the application on the Google Play / App Store
– creating project documentation

React Native Developer

Ideo Sp. z o.o.

I took part in following projects:
• A React Native application for Android and iOS that to record working time based on the history of telephone calls. The application allows to assign spent time to a specific case and a specific client. However, iOS does not provide call information for developers.

• A rewritten React Native application for Android that allows to manage franchisees servicing with following functions:
– scanning goods by barcode,
– displaying information about product prices,
– comparing similar product price available in other stores,
– distributing newsletters and information bulletins for franchisees,
– displaying data on the sale and purchase of goods,
– contacting with representatives,
– delegating tasks to employees,
– sending push notifications (Firebase Cloud Messaging).

Senior React Native Developer

Appwise Software House

– overseeing development and the software development process
– improving and customizing mobile application
– publishing the application on the Google Play / App Store
– creating pages in Vue.js technology
– integration of engines with a mobile application using websockets
– payment gateway Integration
– creating project documentation

React Native Developer

Printbox

– improving and customising mobile applications
– developing new applications based on a template
– implementing payment gateways
– implementing HMS (Huawei Mobile Services)
– redesigning of the application
– publishing the application on the Google Play / App Store
– creating project documentation
– writing unit, integration tests and testing views

Apprentice

Ideo Sp. z o.o.

Developing a React Native application for Microsoft Windows thanks to the react-native-windows library. The application wrapps a website (Webview) and allows to use this page just like an application, i.e links to external websites launched the browser.

Education

Software engineer (B.Eng.) with a strong mobile-cloud foundation—built a Firebase-powered React Native app for real-time transit alerts—and recent expertise embedding GPT-4 and other LLMs to create autonomous agents and automation workflows.

Ai_devs 3 Agents

Remote

AI_devs 3 is a 5-week practical course in the use of Generative AI tools (OpenAI, Anthropic, Groq, Ollama), in which we will fully use the greater capabilities of large language models and, combined with programming skills, build autonomous and semi-autonomous systems, referred to as „Agents”.

Computer Science, specialization in Internet technologies and database

PWSZ Krosno, Engineer

The topic of my engineering thesis was „A mobile application in the React Native technology with a database in a cloud.” I created an application that would notify the user about an oncoming bus, or other means of transport, based on the transport schedule provided by the user. The application was based on the Firebase platform, it allowed to save the data to the Cloud Firestore database, and log in using Authentication (email, Google and Facebook), also supported by Firebase. Notifications were handled natively