Java Fullstack Developer

Place of work: Poland, Mazovian Voivodeship, Greater Poland Voivodeship Form of employment: B2B with ITFS Category: IT Position: Java Fullstack Developer Location: hybrid, once a week from the client's office in Warsaw or Poznań Start date: June 1, 2026 Form of cooperation: B2B with ITFS, long‐term cooperation Rate: PLN 120-140 net + VAT/h Working hours: standard (8:00 AM - 4:00 PM) Client: banking industry Recruitment process: phone call with ITFS (approx. 20 min.) → technical interview with the Client's Tech Leader → decision making Scope of responsibilities Design and development of web applications in Java (backend) and React using the frontend framework. Creating and integrating APIs (REST), maintaining databases, and ensuring application performance and security. Collaborating with the team (testers, DevOps, UX) on system implementation, testing, and maintenance. Sought-after competences Frontend knowledge: React Experience in building web applications with conversational elements (chat): response streaming, conversation history, user feedback, presentation of sources/justifications Backend experience: Java – design and development of API services Basic knowledge of working with BigQuery/SQL Ability to design ergonomic UI for data: tables, charts, drilldown, export results Teamwork experience: Git, code review, quality standards, documentation, testing (unit/integration/e2e) Experience in a production environment: CI/CD, monitoring/logging, incident response Willingness to collaborate with AI Engineers and data teams (API contracts, data formats, validations, cost constraints) Preferred Knowledge of semantic/metrics layer solutions - semantic layer, caching, pre‐aggregations, metrics governance Knowledge of "conversational analytics" tools / product patterns for "chat with data": citations, "show SQL", explore vs. answer modes, trust scoring Knowledge of UI and data‐viz libraries Knowledge of GCP: Cloud Run, Pub/Sub Basics of containerization and implementation: Docker/Kubernetes Experience in a regulated environment (banking): audit, compliance, data classification, security processes We offer Transparent terms of cooperation Opportunity to work on a development project Optional benefits (co‐financing for Enel‐med and Multisport healthcare packages, and a basic accounting package – free for up to three invoices per month) #J-18808-Ljbffr