[Hiring] Senior Database Engineer @XTB

Role Description

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.

• 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.

Qualifications

• 4+ years of hands-on experience as a Database Administrator managing enterprise-scale production environments.
• In-depth practical knowledge of PostgreSQL: master-replica architectures, failover mechanisms (e.g., Patroni), logical/physical replication, and deep performance diagnostics (EXPLAIN plans, pg_stat_statements).
• Hands-on experience with MongoDB in distributed environments: sharding architecture, shard balancing, replica set election mechanics, aggregation pipeline tuning, and wiredTiger engine optimizations.
• Proven expertise in enterprise backup & recovery architectures.
• Strong Linux systems administration background (performance troubleshooting, storage/IOPS analysis, memory management, networking).
• Experience with modern database observability platforms (e.g., Prometheus, Grafana, Zabbix).
• Practical experience with DR and BCP frameworks, including automated failovers and real-world recovery exercises.
• Solid scripting and automation skills: Bash, Python, Ansible, and Git.
• Willingness to participate in paid on-call rotations and occasional travel to data centers.
• Polish proficiency sufficient for fluent communication.
• Technical English proficiency enabling fluent cross-team communication (min. B2 level).

Requirements

• Previous MS SQL and MySQL experience.
• Familiarity with Kubernetes database operators.
• Experience with Terraform or Infrastructure-as-Code workflows for DB provisioning.
• Knowledge of database security, compliance, and auditing standards (data encryption at rest/in transit, TLS, NIS2, GDPR).
• Relevant certifications (e.g., PostgreSQL Certified Professional, MongoDB Certified DBA).

Benefits

• A training budget for courses and conferences that interest you.
• An extra day off on your birthday.
• An extra day off for parents.
• Equipment tailored to your needs.
• Private medical care and group insurance.
• Access to an e-learning platform for learning English and a benefits platform.
• Access to a wellbeing platform.
• Remote work, from the office in Warsaw or from a coworking space in your city.
• 20,000 zł - 22,500 zł a month.