Senior Backend Developer (Java)Warsaw-based opportunity with a hybrid work model (2-3 days/week in the office).As a Senior Backend Developer (Java) you will be working for our client, a global leader providing cutting-edge infrastructure for financial markets, supporting securities trading, post-trade services, and financial data operations worldwide. You will be part of the Stock Exchange Engineering team, driving the development of mission-critical back-end systems that ensure market oversight and integrity. The project focuses on building high-performance, resilient platforms for trading and market data, enabling real-time insights and reliable financial operations that form the backbone of international market infrastructure.Your main responsibilities: Design, develop, and optimize high-performance Java-based internal interfaces for trading and market data ingestion Build and maintain system integration scripts ensuring interoperability across multiple platforms and services Manage and enhance CI/CD pipelines to automate builds, testing, and deployments Expand automated testing frameworks to include unit, integration, and regression coverage Develop and improve Ansible roles to standardize deployments across environments Collaborate within an agile DevOps culture, contributing to continuous improvement and shared ownership Support performance tuning and troubleshooting of distributed systems Participate in architectural discussions and technical design reviews Ensure code quality and adherence to best practices in security and compliance Work closely with cross-functional teams to deliver robust, scalable software solutions You're ideal for this role if you have: 5+ years of professional experience in Java development (Java 17+, Maven, JUnit5) Proven expertise in Python and Ansible for automation and infrastructure-as-code practices Strong DevOps mindset with experience managing GitLab CI/CD pipelines Proficiency in Linux command-line environments and system troubleshooting Familiarity with Docker, OpenShift, and PostgreSQL in enterprise environments Experience designing and maintaining automated testing frameworks Understanding of financial systems or real-time data processing environments Exposure to the FIX protocol and Kafka or similar messaging technologies Excellent analytical and problem-solving skills with attention to detail Strong collaboration skills and experience working in agile teams (SCRUM, SAFe) Exposure to C++ considered a plus We offer you:ITDS Business Consultants is involved in many various, innovative and professional IT projects for international companies in the financial industry in Europe. We offer an environment for professional, ambitious, and driven people. The offer includes: Stable and long-term cooperation with very good conditions. Enhance your skills and develop your expertise in various industries. Work on the most strategic projects available in the market. Define your career roadmap and develop yourself in the best and fastest possible way by delivering strategic projects for different clients of ITDS over several years. Participate in Social Events, training, and work in an international environment. Access to attractive Medical Package. Access to Multisport Program. Access to Pluralsight. Flexible hours & remote work. You can report violations in accordance with ITDS’s Whistleblower Procedure available here.Ref. number 7935