Senior Database Administrator (DevOps expertise)

About Webellian

Webellian is a well-established Digital Transformation and IT consulting company committed to creating a positive impact for our clients. We strive to make a meaningful difference in diverse sectors such as insurance, banking, healthcare, retail, and manufacturing. Our passion for cutting-edge and disruptive technologies, as well as our shared values and strong principles, are what motivate us. We are a community of engineers and senior advisors who work with our clients across industries, playing a deep and meaningful role in accelerating and realizing their vision and strategy.

About the position

As a Senior Database Administrator (DBA) with DevOps expertise within Advanced Analytics Team, you will be the primary owner of database health, reliability, and the full lifecycle of database artifacts across production AI systems. This is not a traditional DBA role - you will bring a strong DevOps mindset to database operations, treating schema migrations, stored procedures, configuration, and database infrastructure as versioned, tested, and continuously delivered artifacts.

Key responsibilities

• Own the database artifact lifecycle: version-control all database objects (schemas, migrations, stored procedures, functions, views, roles) and manage their delivery through CI/CD pipelines using tools such as Flyway, Liquibase, or sqitch.
• Data Engineering experience with Databricks, including designing, developing, and maintaining scalable ETL/ELT pipelines, working with PySpark, Delta Lake, and optimizing data processing workflows to ensure performance, reliability, and data quality.
• Build and operate database CI/CD pipelines in collaboration with DevOps: automated migration testing, schema validation, rollback strategies, and environment promotion (dev to staging to production).
• Monitor and optimise database performance: query analysis with EXPLAIN/EXPLAIN ANALYZE, index tuning, vacuum and autovacuum configuration, connection pool management (PgBouncer), and long-running query governance.
• Own backup, recovery, and disaster recovery procedures: point-in-time recovery (PITR), WAL archiving, replication configuration (streaming and logical), and regular recovery testing.
• Manage database security and access control: RBAC, row-level security (RLS), audit logging, secrets rotation via Azure Key Vault, and compliance with data protection policies.
• Operate and manage PostgreSQL on Azure: Azure Database for PostgreSQL Flexible Server configuration, high availability setup, read replicas, scaling operations, and cost governance.
• Define and enforce database change management standards: peer review of migration scripts, naming conventions, anti-pattern detection, and pre-production validation gates.
• Support Data Engineers and Backend Engineers with database design guidance, query optimisation advice, and hands-on troubleshooting of data access bottlenecks.
• Manage database observability: dashboards and alerting for query performance, replication lag, connection saturation, bloat, and storage growth using Azure Monitor, pg_stat_* views, and Grafana.
• Champion Claude Code as a daily tool for writing and reviewing migration scripts, generating documentation, automating database maintenance tasks, and accelerating troubleshooting.

Required Experience & Skills

• 6+ years of professional DBA experience with PostgreSQL as the primary platform, including deep operational knowledge in production environments.
• Strong database DevOps mindset: experience managing database artifacts as code, with version control, automated testing, and pipeline-driven delivery.
• Hands-on experience with schema migration tooling: Flyway, Liquibase, sqitch, or equivalent - including branching strategies, baseline management, and rollback patterns.
• Expert-level PostgreSQL internals: MVCC, WAL, autovacuum, locking behaviour, query planner, index types (B-tree, GIN, GiST, BRIN), and connection management.
• Experience with PostgreSQL high availability and replication: streaming replication, Patroni or equivalent HA tooling, logical replication, and failover procedures.
• Production experience with Azure Database for PostgreSQL: Flexible Server, HA configuration, PITR, read replicas, and Azure Monitor integration.
• Proficiency in scripting for database automation: Python or Bash for maintenance scripts, migration utilities, audit tooling, and CI/CD integration.
• Experience with CI/CD pipelines in the context of database delivery: integrating migration tooling into GitHub Actions or equivalent, with environment promotion and rollback gates.
• Strong understanding of database security: RBAC, RLS, secrets management (Azure Key Vault), encryption at rest and in transit, and audit trail requirements.
• Knowledge of dbt (data build tool) and experience with data transformation workflows would be a plus.
• Hands-on proficiency with Claude Code: using it daily for migration script authoring, query review, documentation generation, and operational automation.
• Strong communication skills: able to translate database constraints and risks clearly to Backend Engineers, Data Engineers, and product stakeholders.

What we offer

• Contract under Polish law: B2B or Umowa o Pracę
• Benefits such as private medical care, group insurance, Multisport card
• English classes available
• Hybrid work (at least 1 day/week on-site) in Warsaw (Mokotów)
• Opportunity to work with excellent professionals
• High standards of work and focus on the quality of code
• New technologies in use
• Continuously learning and growth
• International team
• Pinball, PlayStation & much more (on-site)

Join a growing team of dedicated professionals! We love to pass on the knowledge to grow excellence, speak our minds without playing politics, and just enjoy hanging around together. If you share our passions - we want to meet you! So go ahead and apply