Database Administrator
Senior Principal Database Administrator at GDIT, responsible for managing enterprise databases across AWS, IBM DB2, and Microsoft SQL Server environments. Leverages deep expertise in Linux and Unix OS to ensure high availability, performance, and security for mission-critical applications.
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Job Description:
DATABASE ADMINISTRATOR SR PRINCIPAL
Advance how our customers operate while you advance your career. Join GDIT as a Database Administrator Sr Principal and build an impactful career in enterprise IT, collaborating with people who are driven and resourceful like you.
MEANINGFUL WORK AND PERSONAL IMPACT
We’re seeking a seasoned Senior Database Administrator (DBA) for the NCMMIS program with deep expertise in IBM Mainframe (z/OS), Db2 (z/OS and LUW), Microsoft SQL Server, PostgreSQL, and AWS Cloud services. In this role, you’ll own the reliability, performance, security, and modernization of mission-critical data platforms across on‑prem, mainframe, and cloud. You’ll lead complex migrations, optimize large-scale databases, automate operations, and partner closely with application, security, and infrastructure teams to deliver resilient, compliant, and cost‑effective data services. Key Responsibilities Platform Ownership & Operations - Administer, configure, and maintain databases across Db2 for z/OS, Db2 LUW, SQL Server, PostgreSQL, and AWS (e.g., RDS/Aurora, EC2-based instances, CloudWatch/Config, and backup/DR services). - Manage schema design, indexing strategies, data partitioning, compression, and workload management for high-throughput transactional and analytical systems. - Implement and verify backup/restore, HA/DR, log shipping, replication, and failover strategies (native tools and third-party solutions). - Perform capacity planning and cost optimization (licenses, storage tiers, IOPS, instance sizing), including AWS cost controls and reservations. Performance & Reliability - Conduct deep performance tuning: query optimization, execution plans, parallelism, memory, I/O, buffer pools, and connection management. - Proactively remediate bottlenecks using profilers, DMVs, EXPLAIN/EXPLAIN ANALYZE, Db2 accounting traces, z/OS SMF data, and cloud metrics. - Establish SLOs/SLAs, observability dashboards, and alerting for availability, latency, and error budgets. Security, Compliance & Governance - Enforce security baselines: encryption (at rest/in transit), secrets management, key rotation (KMS/HSM), RACF/TSS for mainframe, least-privilege roles, and auditing. - Support compliance requirements (e.g., SOX, PCI DSS, HIPAA, GDPR) with robust access controls, data masking, logging, and evidence for audits. - Partner with InfoSec on vulnerability remediation, patching cadence, and incident response. Automation, DevOps & Modernization - Build infrastructure-as-code patterns for data
Posted June 18, 2026