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

Type of contract: Employment contract

Salary range: 10900 - 17500 PLN gross

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

Your skills

• 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

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

We offer

• Hybrid work in our client's office (Kraków) 6 days a month

• Working in a highly experienced and dedicated team

• Benefit package tailored to your needs (medical, sport, lunch subsidy, life insurance, etc.)

• Online training and certifications

• Access to e-learning platform

• Social events