Database Administrator Sr Principal

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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