Senior Front-End Engineer | Join Bluefield Technologies

Bluefield; Kraków; Hybrid; PLN 180,000 - 240,000; Full time

Benefits offered by this job

20 vacation days + state holidays + birthday off

Sick leave coverage

Opportunities for regular business trips abroad

Early access to extra holidays after 5

Job summary

An innovative tech company in Kraków is seeking a Senior Front-End Engineer to lead the development of a mobile web application and admin panels. This role combines architectural design with hands-on coding in a collaborative environment. You will work with technologies like React Native and Python, and be responsible for both frontend and backend integrations, ensuring high performance and an excellent user experience. The position offers a hybrid work model and competitive benefits.

Qualifications

• Experience integrating Google Maps API or similar mapping services.
• React Native Expo production experience shipping consumer mobile apps.
• Deep knowledge of React fundamentals: hooks, context, memoization.
• Deep knowledge of React fundamentals: hooks, context, memoization, rendering performance.
• Experience building map-based UI: react-native-maps, markers, polylines, camera control.
• Implement real-time UX patterns: live location tracking, periodic updates, state synchronization.
• Expertise in navigation: React Navigation, deep linking, nested navigators, modal flows.
• State management at scale (Redux Toolkit, Zustand, Recoil, etc.) with predictable data flow.
• API integration: REST/GraphQL, caching, pagination, retries, error handling.
• Handling auth flows (JWT/OAuth), token refresh, secure storage patterns.
• Strong UI implementation: responsive layouts, accessibility basics.
• Cloud-native development principles.
• Docker for development.
• Kubernetes lifecycle and Helm.
• Familiar with ArgoCD, Grafana, GitHub.
• Nice to have Helmfile familiarity.

Responsibilities

• Architect and scale our React-based mobile web application.
• Build data-heavy Admin Panels for monitoring logistics.
• Design and maintain performant APIs using Python.
• Own feature lifecycle from database schema to CSS transitions.

Skills

Strong JavaScript/TypeScript

React Native Expo

Experience building map-based UI

State management at scale

API integration

JavaScript/TypeScript

React fundamentals

State management at scale

Education

University education (Bachelor's degree)

University education (Master's degree)

Master’s degree

Tools

PostgreSQL

WebSockets

Docker

Kubernetes

Kubernetes

Helm charts

ArgoCD

Grafana

Github

Map libraries (react-native-maps)

Job description

We’re looking for a Senior Front-End 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 sim—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.

Key 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.

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.

Interested? Let’s talk! Join Bluefield Technologies and be part of something new.

Layer Technology

Frontend - React Native Expo, Styled Components, Mobx/Redux, WebSockets. Experience with Firebase, Expo SDK, Expo Modules.

Database - PostgreSQL, Redis (for real-time caching)

Real-time- WebSockets / Socket.io (for "Uber-style" live tracking)

Requirements

Education

• Follow-up/Higher Professional Education
• University education (Bachelor’s degree)
• University education (Master’s degree)

Requirements & Skills

• Experience integrating Google Maps API or similar mapping services.
• React Native Expo production experience shipping consumer mobile apps.
• Strong JavaScript/TypeScript (prefer TypeScript) with clean, maintainable component architecture.
• Deep knowledge of React fundamentals: hooks, context, memoization, rendering performance.
• Experience building map-based UI: react-native-maps / MapView, markers, polylines/routes, camera control.
• Implement real-time UX patterns: live location tracking, periodic updates, state synchronization.
• Expertise in navigation: React Navigation (deep linking, nested navigators, modal flows).
• State management at scale (Redux Toolkit, Zustand, Recoil, or equivalent) + predictable data flow.
• API integration: REST/GraphQL consumption, request caching, pagination, retries, error handling.
• Handling auth flows (JWT/OAuth), token refresh, secure storage patterns (Keychain/Keystore concepts).
• Strong UI implementation skills: responsive layouts, different screen sizes, accessibility basics.
• 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.

Required Skills

• React Native Expo, Styled Components, Mobx/Redux, WebSockets.
• Experience with Firebase.
• Expo SDK, Expo Modules

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, don’t hesitate to send us your CV.

Senior Full Stack Engineer | Join Bluefield Technologies Full-time