System Administrator

4 weeks ago

Singapore ELLIOTT MOSS CONSULTING PTE. LTD. Full time
Roles & Responsibilities

You will administer and support Java application middleware across Apache Tomcat and Oracle WebLogic environments. The role focuses on environment build, configuration, hardening, deployment support, monitoring, and troubleshooting across Dev/QA/Prod. You'll partner with application teams, DBAs, network/security, and DevOps to ensure secure, reliable, and performant services.

Key Responsibilities
  • Environment Build & Configuration

    Install, configure, and maintain Tomcat instances (service wrappers, JVM settings, thread pools, virtual hosts, context paths, HTTP/HTTPS connectors).

    Configure WebLogic domains, admin/managed servers, clusters, data sources (JDBC), JMS, connection pools, and node managers.

    Implement SSL/TLS, manage keystores/certificates, and enforce secure cipher suites and protocols.
  • Deployment & Release Support

    Support deployment of Java applications (WAR/EAR) across Dev/QA/Prod.

    Integrate application services with APIs, databases, and SFTP endpoints.

    Automate repeatable tasks (startup/shutdown, deployments, health checks).
  • Operations, Monitoring & Troubleshooting

    Proactively monitor application and middleware health; configure logging and log rotation.

    Integrate and tune alerts with tools such as Splunk (logging/observability) and Tenable (vulnerability posture).

    Diagnose and resolve incidents related to JVM performance, memory leaks, thread contention, connection pooling, and deployment failures.

    Implement and maintain high availability & load balancing configurations.
  • Security & Compliance

    Apply OS and middleware security patches and updates on a regular cadence (Windows & Linux).

    Remediate vulnerabilities; maintain configuration baselines aligned to security standards and hardening guides.

    Manage certificate renewals and secrets/keystore hygiene.
  • Platform & Infrastructure Administration

    Support Windows Server services (WSUS, basic file/NTFS permissions) and Linux administration for middleware hosts.

    Active Directory basics: user/groups, GPO awareness, DNS entries relevant to app hosting.

    Manage Symantec Endpoint Protection Manager (SEPM) policies on servers.
  • DevOps & Automation

    Use GitLab (CI/CD) for pipeline-driven deployments where applicable.

    Leverage Docker for packaging middleware tools/utilities; use Terraform for IaC in supported environments.

    Contribute to runbooks, SOPs, and environment documentation.
  • Service Management

    Handle user requests and operational queries within SLAs.

    Participate in problem reviews/RCAs and drive continual service improvement.
Required Qualifications & Skills
  • 3–6 years' hands-on experience administering Tomcat and/or WebLogic in enterprise environments.
  • Strong knowledge of Java application hosting, JVM tuning, JDBC data sources, and web security (SSL/TLS, certs, ciphers).
  • Proficiency with SQL fundamentals for connectivity/health checks (any RDBMS).
  • Solid experience with Linux (RHEL/CentOS/Ubuntu) and Windows Server basics.
  • Experience with logging/monitoring (e.g., Splunk) and vulnerability tooling (e.g., Tenable).
  • Familiarity with GitLab CI/CD, Docker, and Terraform (working level).
  • Scripting in Bash and/or PowerShell for automation.
  • Strong troubleshooting, documentation, and stakeholder communication skills.


Tell employers what skills you have

Troubleshooting
Oracle
Active Directory
High Availability
Scripting
Administration
Tuning
Windows Server
SQL
WSUS
Windows
Docker
Databases
DNS
Linux

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