Senior Database Engineer / PostgreSQL

People More works on projects for a large client base in Poland and abroad, building solutions from scratch including UX, UI, frontend, backend, and mobile. They collaborate directly with clients as well as support partners in their own solutions, offering a wide range of projects and the opportunity to change. The company operates internationally and has an office in Kraków, with openness to fully remote work.

• Strong hands-on knowledge of PostgreSQL.
• Experience designing and scaling databases in real production systems.
• Very good knowledge of SQL, query plans, indexes, transactions, and locking mechanisms.
• Ability to independently diagnose and resolve database performance issues.
• Experience with replication, partitioning, backups, and high availability.
• Knowledge of multitenancy, data isolation, and row-level security.
• Ability to work effectively with developers, DevOps engineers, and architects.
• Very good English and Polish language skills.

Nice to have:

• Experience with high-traffic or transaction-heavy systems.
• Knowledge of cloud environments, preferably GCP.
• Experience with database monitoring and observability.
• Knowledge of distributed systems and event-driven architecture.
• Familiarity with AI or agentic coding tools (advantageous but not required).

• Designing PostgreSQL database architecture for large-scale systems.
• Scaling databases to handle growing users, queries, and data volumes.
• Diagnosing and resolving database performance and stability issues.
• Optimizing SQL queries, indexes, data schemas, and PostgreSQL configuration.
• Analyzing query plans, transactions, locks, and concurrency issues.
• Designing replication, partitioning, and high-availability solutions.
• Supporting the team in data modeling and secure data isolation.
• Defining database monitoring, alerting, and capacity planning.