{"id":2112729,"url":"https://alion.io/job/link-group-fullstack-developer-50-java-50-react","title":"Fullstack Developer (50% Java + 50% React)","company":{"id":3913591,"name":"Link Group","domain":"linkgroup.pl","url":"https://alion.io/company/link-group-2","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Backend","role_family":"Backend","seniority":null,"employment_type":"contractor","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Warsaw, Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":140,"max":150,"currency":"PLN","period":"hour","gross":null,"usd_annual":76000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"JavaScript","optional":false},{"name":"React.js","optional":false},{"name":"Rest API","optional":false},{"name":"Spring Boot","optional":false},{"name":"TypeScript","optional":false},{"name":"Apache Kafka","optional":true},{"name":"AWS","optional":true},{"name":"Azure","optional":true},{"name":"CI/CD","optional":true},{"name":"Docker","optional":true},{"name":"GCP","optional":true},{"name":"Java","optional":true},{"name":"Kubernetes","optional":true}],"status":"live","first_seen_at":"2026-09-18T09:18:33Z","employer_posted_date":null,"last_verified_at":"2026-09-18T09:18:33Z","board_verified":false,"closed_at":null,"days_open":31,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":31},"description":"Fullstack Developer (Java 50 / React 50) IT - Software development Full time Hybrid About the Role\nWe are seeking an experienced Fullstack Developer to join a core engineering initiative for a leading global wealthtech and fund distribution platform. In this role, you will balance backend and frontend development (approx. 50/50 split) using Java and React to build and scale complex applications supporting global investment fund and asset management processes.\n\nKey Responsibilities\nDevelop robust backend microservices and application components using Java and Spring / Spring Boot.\nBuild modular, responsive frontend user interfaces using React and JavaScript / TypeScript.\nDesign, build, and integrate high-performance REST APIs.\nCollaborate with international engineering teams on business and technical requirement analysis.\nMaintain, refactor, and enhance existing applications within a complex, service-oriented architecture.\nTroubleshoot, debug, and resolve technical issues across full-stack environments.\nWorking Model & Logistics\nEmployment Type: B2B Contract\nLocation: Warsaw, Poland (Hybrid model: 2 days per week in-office)\nWymagania\nCandidate Profile\nLevel of Experience: Mid-Senior level with a proven track record as 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