Junior React Native Expo Engineer — Real-Time Mobile Apps

DOU Polska; Kraków; Hybrid; PLN 65,000 - 100,000; Full time

Benefits offered by this job

Hybrid work model

Office in Kraków

Job summary

DOU Polska is looking for a Junior Frontend Engineer focused on React Native Expo to join our team in a hybrid setup. You will work on a Real-time micromobility and logistics ecosystem, bridging mobile frontends with Python services powering the logic.

You’ll contribute to mobile-first frontend architecture, admin panels, and scalable backend interfaces, with 60fps performance goals and offline-ready capabilities. English communication required in a fast-paced environment.

Qualifications

• Commercial experience with React Native (Expo).
• Advanced proficiency in React Native Expo.
• Expert-level TypeScript experience with advanced types and strict configurations.
• Deep knowledge of React 18+ fundamentals: hooks, context, memoization, rendering performance.
• Strong knowledge of state management tools (Redux, MobX, Zustand, etc.).
• Experience building map-based UI: react-native-maps / MapView, markers, polylines/routes, camera control, clustering.

Responsibilities

• Architect and scale our React-based mobile web application with a mobile-first approach.
• Build dense, data-heavy Admin Panels for real-time logistics monitoring and dispatching.
• Design and maintain performant APIs using Python (FastAPI/Django) to handle high concurrency.
• Own feature lifecycles from database schema to CSS transitions.

Skills

React Native Expo

TypeScript

React Navigation

Maps / react-native-m maps

Redux / MobX

WebSockets

Firebase

API integration (REST/GraphQL)

GPS / live tracking

Tools

Expo SDK 52+

react-native-maps

Firebase

Job description

DOU Polska is looking for a Junior Frontend Engineer focused on React Native Expo to join our team in a hybrid setup. You will work on a Real-time micromobility and logistics ecosystem, bridging mobile frontends with Python services powering the logic.

You’ll contribute to mobile-first frontend architecture, admin panels, and scalable backend interfaces, with 60fps performance goals and offline-ready capabilities. English communication required in a fast-paced environment.