Database Engineer

XTB is a global company from the financial industry, focusing on online trading of financial instruments. We are the largest FinTech in Poland and a leader in Central and Eastern Europe, and the range of our operations covers several countries, including Asia and South America. At XTB , we focus on the development of our employees, giving them opportunities to gain knowledge and skills in various fields, as well as offering a number of training and development programs. If you are looking for challenges and want to gain valuable experience in an international business environment, XTB is the right place for you. We are a certified Great Place to Work company. We are looking for an experienced Database Administrator (DBA) to take ownership of our mission-critical database infrastructure. In this role, you will manage, scale, and optimize high-availability PostgreSQL clusters and distributed MongoDB sharded environments, ensuring data integrity, peak performance, and enterprise-grade resilience. Responsibilities Administering, configuring, and maintaining production PostgreSQL clusters, including streaming replication, connection pooling, and high-availability setups. Managing distributed MongoDB environments: designing and optimizing sharded clusters, replica sets, and query routing (mongos). Deep performance tuning and capacity planning: identifying bottlenecks, optimizing slow queries, indexing strategies, engine configuration, and OS-level storage I/O parameters. Designing, maintaining, and automating end-to-end backup and recovery strategies (including Point-in-Time Recovery - PITR) for both relational and document stores. Planning and executing regular Business Continuity Planning (BCP) and Disaster Recovery (DR) drills, failover testing, and data restoration drills. Administering databases at the Linux level (Debian/Ubuntu): kernel tuning, memory allocation, storage diagnostics, and system hardening. Automating database maintenance, monitoring, deployments, and routine DBA tasks using Ansible, Python, and Bash. Performing occasional on-site visits to data centers in Poland and across Europe for infrastructure rollouts, recovery tests, or deep diagnostic operations. Collaborating with development, platform, and security teams on data modeling, schema changes, and compliance. Requirements 4+ years of hands-on experience as a Database Administrator managing enterprise-scale production environments. In-depth practical knowledge of PostgreSQL:...

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