Senior Full-Stack Engineer (86/987)

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

Benefits offered by this job

Relocation package

Medical care for you and family

Multisport card

Life insurance

Job summary

Infolet in Kraków is seeking a Senior Full-Stack Developer to build end-to-end web applications and backend services. You will work across frontend React/TypeScript and Java/Spring Boot backends to deliver dashboards, admin consoles and workflow-oriented interfaces.

You will collaborate across UX, integration, and implementation, focusing on maintainable, performant, and reusable solutions for platform users and internal teams. Strong English and fluent Polish are required.

Qualifications

• Strong experience building modern web apps with React and TypeScript.
• Backend development with Java and Spring Boot.
• Experience designing and consuming REST APIs.
• Understanding frontend state management and component architecture.
• Experience with test automation across frontend and/or backend.
• Ability to work across frontend, backend, UX and integration topics.
• Strong problem-solving and independent work in full-stack environments.
• Good English and fluent Polish.

Responsibilities

• Develop responsive web applications using React and TypeScript.
• Build backend services with Java and Spring Boot.
• Create dashboards, admin consoles and workflow-oriented interfaces.
• Design reusable UI components and interaction patterns.
• Integrate frontend with REST APIs and authentication flows.
• Contribute to automated testing across frontend and backend.
• Collaborate across UX, integration and implementation aspects.
• Build maintainable and performant solutions for platform users and admins.

Skills

React

TypeScript

Java

Spring Boot

REST APIs

State management

Test automation

Full-stack

English

Polish

Tools

MUI

WebSockets

SSE

Job description

Project

We are looking for a Senior Full-Stack Developer to build end-to-end web applications and supporting backend services.

You will work across both frontend and backend layers, developing user-facing applications, internal portals, administrative consoles and backend-for-frontend services. The role combines modern React/TypeScript development with Java and Spring Boot backend engineering.

You will collaborate across UX, integration and implementation, with a focus on building maintainable, performant and reusable solutions.

You will

• Develop responsive web applications using React and TypeScript
• Build backend services and Backend-for-Frontend (BFF) APIs using Java and Spring Boot
• Create dashboards, admin consoles and workflow-oriented interfaces
• Design reusable UI components and consistent interaction patterns
• Integrate frontend applications with REST APIs, authentication flows and operational data sources
• Contribute to automated testing across frontend and backend layers
• Work across UX, integration and implementation aspects of the applications
• Build maintainable and performant solutions for platform users, administrators and internal teams

Must have

• Strong experience building modern web applications with React and TypeScript
• Good backend development experience with Java and Spring Boot
• Experience designing and consuming REST APIs
• Good understanding of frontend state management and component architecture
• Experience with test automation across frontend and/or backend
• Ability to work across frontend, backend, UX and integration topics
• Strong problem-solving skills and ability to work independently in a full-stack environment
• Good English and fluent Polish

Nice to have

• Experience building internal portals, operational dashboards or developer-facing tools
• Familiarity with design systems and accessibility
• Experience with data visualization libraries
• Exposure to WebSockets or Server-Sent Events (SSE)
• Experience with Material UI (MUI)

Our offer

• Relocation package (4500 PLN total value), paid in three installments (1500 PLN per month) in case your permanent presence in the office is mandatory, and you need to relocate from another city
• Benefits: Extended medical care (over 2000 medical facilities in Poland, 80 in Kraków) for you and your family; Multisport Benefit card; life insurance