Logo for XTB online trading

Database Engineer

XTB online trading

Role overview

Summary

This role is for a Database Administrator at XTB, responsible for managing and optimizing critical database infrastructures. You will work within a global financial company, ensuring data integrity and performance across PostgreSQL and MongoDB environments.

Qualifications

  • 4+ years of hands-on experience as a Database Administrator managing enterprise-scale production environments.
  • In-depth practical knowledge of PostgreSQL, including master-replica architectures and performance diagnostics.
  • Hands-on experience with MongoDB in distributed environments, including sharding architecture and aggregation pipeline tuning.
  • Strong Linux systems administration background, including performance troubleshooting and memory management.
  • Polish proficiency sufficient for fluent communication.

Responsibilities

  • Administer, configure, and maintain production PostgreSQL clusters.
  • Manage distributed MongoDB environments, including sharded clusters and replica sets.
  • Perform deep performance tuning and capacity planning for databases.
  • Design and automate end-to-end backup and recovery strategies.

Key facts

Hard skills

Other skills

  • Communication
  • Collaboration

About the company

XTB online trading logo

XTB online trading

  • Capital Markets & Investment Banking
  • 1,001–5,000
XTB is a global fintech company that provides individual investors with instant access to financial markets from around the world through an innovative online investing platform and the XTB mobile app. Founded in Poland in 2004, we currently support over 1 million customers globally in achieving their investment ambitions. At XTB, we are committed to the ongoing development of the online investing platform enabling our customers to trade 6,300+ instruments including stocks, ETFs, CFDs based on currency pairs, commodities, indices, stocks, ETFs, and cryptocurrencies. With the recent launch of Investment Plans, a long-term passive investing product, our clients can now unlock the growing potential of ETFs and diversify their portfolios effectively. In the key markets, we're offering interest rates on uninvested funds enabling investors to put their money to work and benefit even when they aren't actively investing. Our online platform is a top destination not only for investing but also market analysis and education. We offer an extensive library of educational materials, videos, webinars, and courses to help our customers become better investors irrespective of their trading experience. Our customer service team provides support in 18 languages and is available 24/5 via email, chat, or phone. In over two decades of activity in the financial markets, we have expanded our reach to having more than 1,000 employees. XTB is headquartered in Poland with offices in multiple countries across the globe, including the UK, Germany, Romania, Spain, Czech Republic, Slovakia, Portugal, France, Dubai and Chile. Since 2016, XTB shares have been listed on the Warsaw Stock Exchange. We are regulated by the world’s largest supervisory authorities: Financial Conduct Authority, Polish Financial Supervision Authority, Cyprus Securities & Exchange Commission, Dubai Financial Services Authority and Financial Services Commission. Investing is risky. Invest responsibly.
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Job description

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: 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).

    • Nice to have
  • 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).

    • What we offer
  • Real influence on the development of the company and the product.
  • Work in an experienced team that is happy to share its knowledge.
  • A clear vision of development thanks to regular feedback and clear career paths.
  • Regular team-building meetings.

    • 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.
    •

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