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GFT Technologies SE

FullStack Consultant (TypeScript, React, and Next.js)

GFT Technologies SE Krakow, Lesser Poland Voivodeship, Poland · PLN 187K–PLN 260K/yr

IT Services and IT Consulting · 10,001+ employees

21 h ago
typescript Mid (2-5 yrs) Contractor Poland
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About the role

You will design, build, and maintain responsive user interfaces using TypeScript and Next.js while integrating them with Java and Spring Boot backend services. The role involves collaborating with cross-functional teams to deliver secure, accessible, and high-quality full-stack features.

What they look for

TypeScript React Next.js Java Spring Boot REST APIs Frontend Architecture State Management Unit Testing Integration Testing SQL Observability Secure Development API Integration Responsive Design

Requirements

Candidates must have strong experience with TypeScript, React, and Next.js, along with a solid understanding of modern frontend architecture and API integration. Proficiency in Java and Spring Boot, as well as experience with secure development practices and testing frameworks, is required.

Full description

Type of contract: B2B contract

Salary range: 90 - 125 PLN/H

What will you do?

You will build and improve user-facing experiences and product APIs that support modern data services. The role combines strong frontend development with practical full-stack delivery, translating product needs into accessible, reliable, and secure solutions across browser and service layers.

Your tasks

  • Design, build, and maintain TypeScript and Next.js user interfaces that are responsive, accessible, and aligned with business needs
  • Deliver end-to-end product features across frontend and backend integration layers
  • Collaborate with product, UX, backend, and data teams to refine user journeys, data contracts, and acceptance criteria
  • Build secure and maintainable frontend solutions using reusable components and well-structured state management
  • Integrate frontend applications with Java 21 and Spring Boot services
  • Diagnose and resolve UI defects, API integration issues, performance bottlenecks, and production issues
  • Develop and maintain unit, integration, and regression tests
  • Support application quality through observability, logging, performance tuning, and production follow-up
  • Maintain high engineering standards for code quality, code reviews, secure development, and deployment readiness

Requirements

  • Strong experience with TypeScript, React, and Next.js
  • Good understanding of modern frontend architecture, component design, state management, routing, API integration, and accessible UI patterns
  • Experience delivering full-stack features across browser and service layers
  • Working knowledge of Java and modern Spring Boot application patterns
  • Experience with REST APIs, DTOs, authentication flows, and integration contracts
  • Ability to write clean and maintainable code and participate in technical design and code reviews
  • Understanding of secure frontend and backend practices, including token handling, role-based access, and safe data handling
  • Strong problem-solving skills and experience investigating production issues across UI and API layers
  • Good communication and collaboration skills
  • Openness to work hybrid from our client's office (Kraków) 6 days a month

Nice to have

  • React Query, Redux Toolkit, TanStack Query, or similar state management and data-fetching solutions
  • Axios, forms, validation, and component libraries
  • Spring Web, Spring Security, or Spring Data JPA
  • PostgreSQL, database design, or database migration patterns
  • OpenTelemetry, Micrometer, structured logging, or production monitoring tools
  • Cloud-native or containerised delivery environments
  • JUnit 5, Vitest, Playwright, or equivalent testing frameworks

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