Available for projects

Bartłomiej Zimny

Senior React & React Native Developer
Building high-quality mobile & web applications with 7+ years of experience in React ecosystem. Passionate about clean code, architecture patterns, and delivering production-ready solutions.

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7+
Years Experience
20+
Projects Delivered
5
Companies
const developer = {   name: "Bartłomiej Zimny",   role: "Senior React Native Dev",   location: "Poland, Rzeszów",   skills: ["React", "RN", "TS"],   passion: "Mobile Architecture",   hire() {     return "Let's build together!";   } };

Tech Stack

Technologies I work with daily to build production-ready applications.

React React Native TypeScript JavaScript Redux MobX Firebase CI/CD Node.js REST API GraphQL Git Docker AWS Vue.js WebSockets Payment Gateways Unit Testing Integration Testing App Store Publishing

Experience

Career path through companies that shaped my expertise.

2024 – Present

Senior React Native Developer

Apreel
  • Overseeing development and the software development process
  • Improving and customizing mobile application
  • Publishing the application on the Google Play / App Store
  • Creating project documentation
2023 – 2024

Senior React Native Developer

Odrabiamy.pl / Makalu Media
  • Creating and monitoring development paths
  • Helping the team to develop
  • Overseeing development and the software development process
  • Implementing payment gateways
  • Redesigning the application
  • Publishing on Google Play / App Store
2022 – 2023

Senior React Native Developer

Appwise Software House
  • Overseeing development process
  • Creating pages in Vue.js
  • WebSocket integrations with mobile app
  • Payment gateway integration
  • Creating project documentation
2021 – 2022

React Native Developer

Printbox
  • Improving and customising mobile applications
  • Implementing payment gateways
  • Implementing HMS (Huawei Mobile Services)
  • App redesign
  • Writing unit & integration tests
2020 – 2021

React Native Developer

Ideo Sp. z o.o.
  • React Native app for Android/iOS — work time tracking
  • Franchise management app with barcode scanning
  • Push notifications via Firebase Cloud Messaging
  • Task delegation & newsletter distribution

Projects

Selected projects I've worked on — from mobile apps to web platforms.

T TaskForge

TaskForge

Parametrized task bank and test generator for teachers — curriculum mapping, randomized variants, Word export. Ships as web, Tauri desktop...
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AV AI Voice

AI Voice

Hands-free chat client for Anthropic, OpenAI, OpenRouter, Gemini and GLM. Voice-first UI, on-device threads, nine languages, CarPlay support.
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Education & Certificates

Continuous learning is part of the journey.

2024

AI_devs 3 — Agents

Remote

Practical course in Generative AI tools — building autonomous and semi-autonomous systems with LLMs.

2017 – 2021

Computer Science (B.Eng.)

PWSZ Krosno

Thesis: "A mobile application in React Native with Firebase database" — real-time transit alert system.

2024

AI Devs 2

Remote

Connecting GPT-4 with application and automation logic.

Blog

Thoughts, tutorials, and insights from the world of mobile & web development.

Blog posts coming soon.

Get in Touch

Have a project in mind? Let's talk.

Location
Poland, Rzeszów