Germany
* PostgreSQL specialist with 30+ years in databases and 12+ years focused on PostgreSQL, combining deep internals knowledge with hands-on reliability engineering and heterogeneous database migration. * Early adopter of LLMs upon their European release; extensive use of GitHub Copilot and Gemini AI for advanced tool development, data analysis, and technical writing. * Primary author and maintainer of credativ-pg-migrator, an open-source tool for migrating Oracle, IBM DB2 (LUW and z/OS), Informix, Sybase ASE, MS SQL Server, SQL Anywhere, MySQL and MariaDB to PostgreSQL, distributed via the official PostgreSQL apt repository and PyPI. * Active and well-known speaker on the European PostgreSQL conference circuit, blending source-code-level technical depth with clear, memorable storytelling. * Native Czech speaker, professional-level English, strong German, Polish, Russian understanding.
Professional Service Consultant / Database reliability engineer - PostgreSQL, DuckDB, MySQL, MS SQL, Sybase ASE, Informix NetApp decided at the end of 2024 to sell some parts, therefore I was moved in March 2025 into newly created credativ GmbH.
- 2026.06.25 - Swiss PG Day 2026 - keynote: The Next Generation Story of PostgreSQL: From Systems Mechanics to Experience Builders - 2026.06.17 - POSETTE 2026 - Linux and PostgreSQL in the Multiverse of Connections - 2026.05.23-24 - FedCon 2026 Bonn (sci-fi convention) - Beyond AI-Generated Rubbish - The Chosen One is Boring - 2026.05.05 - PG Conf Belgium - Migrating Legacy & Proprietary Databases to PostgreSQL - 2026.04.26-28 - HOW2026 Jinan China - 3-hours workshop: The Alchemy of Shared Buffers: Balancing Concurrency and Performance - talk: Linux and PostgreSQL in the Multiverse of Connections - 2026.04.21-22 - PostgreSQL Conference Germany - Beyond work_mem Myths: A Source‑Code‑Guided Tour Through PostgreSQL Memory Usage (v2) - Migrating Legacy & Proprietary Databases to PostgreSQL with credativ-pg-migrator - 2026.03.28 - Chemnitzer Linux Tage - workshop: Everything, Everywhere, All At Once About PgBouncer - talk: Migrating Legacy and Proprietary Databases to PostgreSQL - 2026.03.24 - NORDIC PGDay 2026 Helsinki - Beyond work_mem Myths: A Source‑Code‑Guided Tour Through PostgreSQL Memory Usage - 2026.02.06 - CERN PGDay 2026 - The Alchemy of Shared Buffers: Balancing Concurrency and Performance - 2026.01.27 - Prague PostgreSQL Developer Day - 3 hours workshop - Everything, Everywhere, All At Once About PgBouncer - 2026.01.26 Prague PostgreSQL MeetUp - Self-Driving PostgreSQL: Should we allow our database to auto-tune itself while we sleep?
- 2025.10.24 PG Conf EU 2025 - Database in Distress: Testing and Repairing Different Types of Database Corruption - 2025.10.15 Postgres Ibiza 2025 - Iceberg Ahead! PostgreSQL Sailing Confidently in Data Lakehouse Waters - 4 talks - credativ Tech talks: September - November (see in posts) - 2025.09.22 Prague PostgreSQL Meetup - PostgreSQL Connections Memory Usage on Linux: How Much, Why, and When? - 2025.09.12 PG Day Lowlands 2025 - Database in Distress: Testing and Repairing Different Types of Database Corruption - 2025.09.11 PostgreSQL Usergroup NL MeetUp Rotterdam - Lightning talk: Boldly Migrate to PostgreSQL with credativ-pg-migrator - 2025.07.02 Armenia PostgreSQL User Group Online MeetUp - PostgreSQL Connections Memory Usage: How Much, Why and When - 2025.06.27 Swiss PG Day 2025 - Building a Data Lakehouse with PostgreSQL: Dive into Formats, Tools, Techniques, and Strategies - Lightning talk: Boldly Migrate to PostgreSQL with credativ-pg-migrator - 2025.06.19 PostgreSQL Meetup Berlin - Database in Distress: Testing and Repairing Different Types of Database Corruption - Lightning talk: Boldly Migrate to PostgreSQL with credativ-pg-migrator - 2025.06.03 PostgreSQL User Group NRW MeetUp - Boldly Migrate to PostgreSQL with credativ-pg-migrator - 2025.05.08 PostgreSQL Conference Germany 2025 - Building a Data Lakehouse with PostgreSQL: Dive into Formats, Tools, Techniques, and Strategies - PostgreSQL Connections Memory Usage on Linux: How Much, Why, and When? - Your Data Deserves the Best: Migration to PostgreSQL - 2025.01.29 Prague PostgreSQL Developer Day 2025 - Building a Data Lakehouse with PostgreSQL: Dive into Formats, Tools, Techniques, and Strategies - 2025.01.27 NetApp tech talk - PostgreSQL Connections Memory Usage... - 2025.01.23 NetApp tech talk - Building a Data Lakehouse with PostgreSQL... - 2025.01.08 Postgres MeetUp for All - PostgreSQL and DuckDB: Supercharging ad-hoc Data Analysis and ETL
- 2024.11.26 - NetApp internal talk - "PostgreSQL and DuckDB: Supercharging ad-hoc Data Analysis and ETL" - 2024.11.15 - NetApp Tech Talk - "Many facets of AI hallucinations: factual errors, deep fakes, and creativity" - 2024.11.12 - Internal Workshop - 3 talks: - "PostgreSQL 17: New Features" - "PostgreSQL Architecture: How PostgreSQL functions under the Hood" - "PostgreSQL Partitioning: Overview of Solutions, Tips & Tricks, Performance" - 2024.10.29 - Prague PostgreSQL MeetUp - "PostgreSQL and DuckDB: Analytics Performance and Use Cases" - 2024.10.16 - NetApp internal workshop - "AI Workshop: Exploring Artificial Intelligence" - 3 talks: - "The AI Dilemmas: The Philosophical, Ethical, and Legal Implications of AI" - "Understanding the Magic of LLMs: A Deep Dive into the Internal Structure of LLMs" - "Many facets of AI hallucinations: factual errors, deep fakes, and creativity" - 2024.10.09 PostgreSQL MeetUp Berlin - "GIN, BTREE_GIN, GIST, BTREE_GIST, HASH and BTREE indexes on JSONB data" - 2024.09.27 NetApp internal talk - "Beyond the Buzzwords: A pragmatic explanation of LLM terminology" - 2024.10.13 NetApp internal talk - "The Art and Science of AI Prompt Engineering" - 2024.07.16 - PostgreSQL MeetUp Berlin July 2024 - Lightning talk: "Can PostgreSQL have a more prominent role in the AI boom?" - 2024.06.27 Swiss PG day - "GIN, BTREE_GIN, GIST, BTREE_GIST, HASH and BTREE indexes on JSONB data" - Lightning talk: "Can PostgreSQL have a more prominent role in the AI boom?" - 2024.06.05 Prague PostgreSQL Developer Day - "GIN, BTREE_GIN, GIST, BTREE_GIST, HASH and BTREE indexes on JSONB data"
Professional Service Consultant / Database reliability engineer - PostgreSQL, DuckDB, MySQL, MS SQL, Sybase ASE NetApp decided at the end of 2024 to sell some parts, therefore I was moved in March 2025 into newly created credativ GmbH.
* Database administrator - PostgreSQL, MySQL * Database developer -BigQuery, BigTable, PostgreSQL, MySQL * DevOps - Google cloud platform admin * Monitoring - Prometheus, Grafana * Business intelligence - dashboards, reports in Looker Data Studio, Grafana
I joined the company when it had only 25 members and over 7 years worked on different key projects: Data Warehousing & ETL processes: - Migrated data warehouse from PostgreSQL to BigQuery, improving data model & accelerating OLAP queries 30x - Optimized ETL tasks, reducing largest task runtime from 11hrs to 1hr Billing process automation: - Developed automated billing on PostgreSQL - Later migrated it to BigQuery, cutting runtime from 48+ hrs to <1 hr Data Ingestion Pipeline Enhancements: - Repeatedly enhanced PostgreSQL and MySQL throughput, improved high availability, implemented robust backup & restore processes BI Dashboard: - Used Elasticsearch to speed up dashboards 10x & provide better data segmentation - Reorganized PostgreSQL data model using multilevel partitioning, reducing response times from minutes to seconds GCP Administration: - Managed GCE databases, maintenance of Kubernetes clusters, permissions, BigQuery objects maintenance - in Terraform - Developed Ansible scripts for Linux admin - Implemented monitoring/alerting - analyzed GCP/BigQuery audit logs for costs and resource usage efficiency Data as Product - Data Quality & Data Governance: - Performed in-depth data analysis, identified improvement areas, created predictive analysis of possible KPIs improvements - Defined data governance strategy, data quality checks & processes, improving data accuracy & consistency - Implemented monitoring/alerting for data quality incidents Technologies: - Big Data: BigQuery, BigTable, Google Spanner, PostgreSQL, MySQL; Formats: Avro, Parquet, Protobuf, JSON - SQL: Expert level; Programming: Python, Go, Bash; ETL/ELT: Airflow, K8S CronJobs; Cloud: Terraform, Helm, Ansible - Data Streaming: Kafka; CI/CD: Git/GitHub, Google Cloud Builder, Docker, Kubernetes/Minikube - Visualization/Monitoring: Elasticsearch, Google Looker, Grafana, Prometheus, InfluxDB, Fluentd, Stackdriver - Linux: Debian/Ubuntu/CentOS - Agile PM: Scrum, Kanban, Jira/Trello, Miro boards