About the Position

Senior Full-Stack Engineer | Join Bluefield Technologies

Kosice, Poland (Krakow), Czechia (Prague)

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About the Role

We’re looking for a Senior Full-Stack Engineer 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-where split-second logistics meet seamless user experiences. We need a Full Stack powerhouse to lead 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.

Responsibilities

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.

Requirements

Education: Follow-up/Higher Professional Education
Experience: 4+ years of commercial experience with React Native (Expo)
Skills:
- 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).
- Proven experience in Python and backend development using FastAPI / Django / Flask.
- Understand principles of cloud native development.
- Usage of docker for development environment.
- Familiar with Kubernetes (application lifecycle and environment).
- Familiar with Helm charts (their maintenance and usage).
- Familiar with ArgoCD, Grafana, Github.
- Nice to have - familiarity with helmfile.

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

Frontend: React Native Expo, Styled Components, Mobx/Redux, WebSockets. Experience with Firebase, Expo SDK 52+, 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).

Language Skills

English: Upper intermediate (B2).

Why Join Us?

Work on a product with immediate, real-world impact.
A "no-red-tape" environment where your architectural decisions stick.
Interested? Let’s talk! Join Bluefield Technologies and be part of something new.

Employee Perks & Benefits

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.
The longer you are with us, the more interesting benefits you will have! (additional holidays and after 5 years you will receive an extra one month paid holidays!)

Information about the Selection Process

In case you think this is the right job for you, and fulfill the criteria mentioned in this job ad, do not hesitate to send us your CV.

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