Database Administrator

• Open to Infrastructure Engineers with database operations/maintenance experience.
• Work on large-scale production database environments.
• Hands‑on opportunity to scale modern technologies in a large, production‑grade environment

About The Role

We are looking for a Database Operations Engineer to support the reliability, performance, and continuous improvement of large-scale payment and transaction systems. This position sits between infrastructure and application teams, helping drive database optimization, operational excellence, and capacity planning initiatives.

The ideal candidate has hands-on experience managing MySQL or MariaDB environments from an infrastructure and operations perspective, rather than an application development background.

Responsibilities

• Perform database health checks and identify operational risks or improvement opportunities
• Analyze and resolve performance issues, including slow queries and resource bottlenecks
• Conduct database memory tuning and performance optimization
• Support capacity planning and database maintenance initiatives
• Investigate the impact of database upgrades and infrastructure changes
• Compare and resolve differences across database environments
• Review SQL performance and provide tuning recommendations
• Lead and coordinate database-related operational projects
• Improve database efficiency through activities such as user account cleanup, index optimization, and operational process improvements
• Collaborate closely with infrastructure, development, and platform teams to ensure stable database operations

Required Qualifications

• Hands-on experience operating and maintaining MySQL and/or MariaDB
• Experience managing databases from an infrastructure, platform, or system administration perspective
• Strong understanding of database operations, troubleshooting, and performance optimization
• Experience supporting production environments

Language Requirements

• Japanese: Business level or above (required)
• English: Conversational level or above (reading/writing and basic communication is sufficient)