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