Senior Database Administrator (PostgreSQL and MySQL Focus)

Commit; Warszawa; On-site; PLN 180,000 - 260,000; Full time

Job summary

Commit is seeking a Senior Database Administrator to design, deploy, and optimize highly available PostgreSQL and MySQL systems in production. You will work hands-on across on-prem and cloud deployments, ensuring reliability, performance, and security.

You will collaborate with DevOps and data teams, lead migrations to cloud services, implement monitoring and DR strategies, and drive automation using Bash, Python, and Ansible. Strong SQL and indexing know-how are essential.

Qualifications

• 3+ years of hands-on experience with PostgreSQL in production environments.
• 3+ years of experience with MySQL in production environments.
• Experience with at least one public cloud platform (AWS, GCP, or Azure), including managed database services.

Responsibilities

• Design, configure, and maintain PostgreSQL and MySQL databases in production environments.
• Ensure high availability, disaster recovery, and performance optimization of database systems.
• Perform database migrations (on-premises to cloud and cross-cloud environments).
• Troubleshoot and resolve database issues across development, testing, and production environments.
• Implement database monitoring, backup strategies, and security best practices.
• Collaborate with development, DevOps, and data teams on schema design, query tuning, and ETL pipelines.
• Participate in capacity planning, cost optimization, and automation initiatives.
• Document database systems, configurations, procedures, and runbooks.

Skills

PostgreSQL

MySQL

SQL

Cloud platforms (AWS / GCP / Azure)

Scripting (Bash / Python / Ansible)

Migration experience

Tools

Bash

Python

Ansible

Job description

We are seeking a Senior Database Administrator with strong expertise in PostgreSQL and MySQL to join our team. The ideal candidate is a hands-on professional capable of designing, deploying, maintaining, and optimizing highly available and scalable database systems. Experience with additional database technologies such as SQL Server and MongoDB is a strong advantage.

This role also involves working with cloud-native database services across providers such as AWS, Google Cloud, or Azure. Candidates with database migration experience will be given preference.

Key Responsibilities

• Design, configure, and maintain PostgreSQL and MySQL databases in production environments
• Ensure high availability, disaster recovery, and performance optimization of database systems
• Perform database migrations (on-premises to cloud and cross-cloud environments)
• Troubleshoot and resolve database issues across development, testing, and production environments
• Implement database monitoring, backup strategies, and security best practices
• Collaborate with development, DevOps, and data teams on schema design, query tuning, and ETL pipelines
• Participate in capacity planning, cost optimization, and automation initiatives
• Document database systems, configurations, procedures, and runbooks

Requirements

Required Qualifications

• 3+ years of hands-on experience with PostgreSQL in production environments
• 3+ years of experience with MySQL
• Experience with at least one public cloud platform (AWS, GCP, or Azure), including managed database services (e.g., RDS, Cloud SQL)
• Strong SQL skills with a solid understanding of indexing, query optimization, and partitioning
• Proven knowledge of backup & recovery strategies, replication, and high-availability configurations
• Proficiency in scripting and automation (e.g., Bash, Python, Ansible)
• Experience supporting database migration projects (e.g., PostgreSQL to cloud, MongoDB to Atlas, SQL Server upgrades)

Advantageous Qualifications

• Familiarity with MongoDB, SQL Server, Neo4j, or other NoSQL databases
• Experience with ETL tools, BigQuery, or data warehousing concepts
• Relevant certifications (PostgreSQL, MySQL, AWS, GCP, or Azure)
• Exposure to DevOps practices and infrastructure-as-code tools