Full Stack Engineer (Java + React)
Summary
Builds and maintains full-stack applications using Java (11+) and React, modernizing legacy systems (e.g., IBM WebSphere) into scalable microservices while improving efficiency via automation and STP.
LocationKraków, Poland, Poland# Full Stack Engineer (Java + React) at N Consulting LtdLocationKraków, Poland, PolandSalary£300 - £350 /dayJob TypeContractDate PostedMarch 19th, 2026Apply NowJob Opportunity: Full Stack Engineer (Java + React) Location: Kraków, Poland (2 days office / 3 days remote) Experience: 5–10 years Assessment: Karat Assessment requiredRole Overview We are looking for a skilled Full Stack Engineer to design, build, and maintain modern applications and services. This role involves working across both backend and frontend technologies, contributing to system modernization, and improving efficiency through automation and microservices.Key Responsibilities Build and support backend and frontend applications using Java (11/17/21) and ReactJS Develop and maintain microservices and APIs Modernize legacy systems by migrating from mainframe and IBM WebSphere to scalable microservices architectures Improve system efficiency by increasing Straight-Through-Processing (STP) Reduce testing costs through automation frameworks Contribute to overall system design, scalability, and performance improvementsRequired Skills & Experience Strong experience with Java 11+ (Java 17+ preferred) Hands-on experience with Kubernetes Proficiency in Git Strong command of Unix/Linux systems and CLI Experience with databases and SQL (Oracle preferred) Solid understanding of RESTful APIs and microservices architectureNice to Have Experience with JavaScript and React Exposure to DevOps environments Knowledge of application monitoring tools Familiarity with Spring / Spring BootSelection Process Karat technical assessment is mandatory