Junior Front-End Engineer (React Native Expo)
First seen by Alion on Oct 12, 2026.
We’re looking for a Junior Front-End Engineer (with React Native Expo experience) to join our team.
Work Location: Poland (Krakow), Slovakia (Kosice) or Czechia (Prague).
Hybrid: 2+ days per week in the office, the rest remote.
The Mission
We are building a complex, real-time ecosystem for micromobility and logistics systems sim—where split-second logistics meet seamless user experiences. We need a Junior Front-End to work on the development of our Customer Mobile Web App and our high-utility Internal Admin Panels.
You’ll be the bridge between the sleek, high-performance interface our users see and the robust, scalable Python services that power the logic.
Mobile-First Frontend: Architect and scale our React-based mobile web application, ensuring 60fps performance and offline-first capabilities.
Operational Control Centers: Build dense, data-heavy Admin Panels that allow our operations team to monitor real-time logistics, manage users, and handle complex dispatching.
Scalable Backend: Design and maintain performant APIs using Python (FastAPI/Django) to handle high-concurrency event streams.
End-to-End Ownership: From database schema design to CSS transitions, you’ll own the entire feature lifecycle.
Who You Are
The Architect: You don't just "write code"; you design systems. You understand how a change in a Python microservice ripples out to the React frontend.
UX Enthusiast: You understand that an Admin Panel requires different UX "muscle" (efficiency and density) than a mobile app (simplicity and speed).
Problem Solver: You’ve dealt with the "hard stuff"—real-time GPS tracking, race conditions in booking logic, or complex state management.
Pragmatist: You balance the need for clean, tested code with the reality of shipping features in a fast-paced environment.
Will be a plus Led transformation of standalone product into scalable SaaS platform.
Why Join Us?
Work on a product with immediate, real-world impact.
A "no-red-tape" environment where your architectural decisions stick.
Layer Technology
Frontend - React Native Expo, Styled Components, Mobx/Redux, WebSockets. Experience with Firebase, Expo SDK, Expo Modules.
Backend - Python (FastAPI / Django / Flask)
Database - PostgreSQL, Redis (for real-time caching)
Infrastructure - AWS/GCP, Docker, Kubernetes
Real-time - WebSockets / Socket.io (for "Uber-style" live tracking)
Requirements & Skills - Senior Front-End Engineer
What We’re Looking For:
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.
Strong UI implementation skills: different screen sizes, accessibility basics.
Hands-on experience with GPS / background location tracking
Expertise in navigation: React Navigation (deep linking, nested navigators, modal flows).
API integration: REST/GraphQL consumption, request caching, pagination, retries, error handling.
Handling auth flows (JWT/OAuth), token refresh, secure storage patterns (Keychain/Keystore concepts).
Core responsibilities:
Full end-to-end ownership of the mobile app (iOS & Android)
App maintenance, releases, production stability & incident handling
GPS / geolocation + live tracking
REST API + real-time event integration
Performance, reliability, and architecture improvements
Ability to understand business requirements and translate them into technical requirements.
Required Skills
React Native Expo, Styled Components, Mobx/Redux, WebSockets.
Experience with Firebase.
Expo SDK 52+, Expo Modules
Language Skills
English: Upper intermediate (B2)
We offer:
Challenging and rewarding tasks with autonomy in a distributed international team
Motivated colleagues who foster a collaborative environment
Competitive salary based on your experience and expertise
20 vacation days + state holidays + your birthday off (for full-time employees)
Sick leave coverage (5 days for full-time employees)
Opportunities for regular business trips abroad