We are looking for a DBA – App Admin for one of our clients, a professional with a strong focus on infrastructure and security, capable of ensuring that our production environments operate stably, securely, and with high performance. If you master **Linux, hardening, MySQL, and SSH security**, this position is for you. **What will you do?** Apply hardening to Linux servers (security, access control, services, SSH). Administer and optimize MySQL at the engine level (configuration, logs, tuning). Manage secure access: SSH, keys, permissions, certificates. Perform backups, restorations, and integrity validation. Analyze MySQL, Tomcat, and operating system logs to prevent incidents. Administer QA / Production environments and support deployments. Document configurations and security best practices. **Mandatory Requirements** These points are essential to proceed: ✔ Experience administering Linux (CentOS / Red Hat / Ubuntu Server) ✔ Server hardening experience ✔ SSH configuration using public/private keys ✔ MySQL backup/restore experience ✔ Editing of my.cnf or other database engine configuration files ✔ Handling of MySQL/Tomcat/Linux logs ✔ Participation in production environments Note: If your experience is limited to SQL development or basic support, this role is not suitable. **Plus (not mandatory but valuable)** Tomcat knowledge Use of monitoring tools (Grafana, Zabbix, Prometheus, Nagios, etc.) Automation or scripting experience (Bash) **What do we offer?** Stable project with a leading digital security company High-performance culture focused on infrastructure Opportunity to develop your seniority in critical environments Technical team that values documentation, security, and best practices Position type: Full-time Salary: $20,000.00 – $40,000.00 per month Workplace: On-site employment