> Markdown version of [/jobs/ext/554484-principal-database-administrator-dba-mainframe-db2-z-os](https://www.wearedevelopers.com/jobs/ext/554484-principal-database-administrator-dba-mainframe-db2-z-os). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Principal Database Administrator/DBA (Mainframe Db2 z/OS) - **Company:** Fmr LLC - **Location:** Westlake, TX, United States - **Contract:** Permanent contract - **Skills:** Amazon Web Services, Cloud Database, COBOL (Programming Language), Databases, IBM DB2, Distributed Data Store, Job Control Language (JCL), PostgreSQL, Mainframes, Oracle (Applications), Performance Tuning, SQL Databases, Data Streaming, Z/OS, Enterprise Software Applications, Cloud Platform System, Apache Kafka, Data Management, Database Replication, Physical Design - **Published:** June 5, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=ba6fde7e70b553e4 ## About the Role Do you have experience in Vendor communication?, * Extensive hands-on experience managing large, complex mainframe Db2 z/OS database environments * Deep expertise with IBM IIDR replication technologies (Q Rep / CDC), including setup, monitoring, tuning, and troubleshooting * Strong skills in Db2 utilities, SQL, JCL, and working knowledge of COBOL application interactions * Proven experience supporting mission-critical production systems with strict SLAs * Excellent communication skills and ability to work effectively across applications, infrastructure, and vendor teams Preferred / Nice to Have * Experience integrating mainframe data platforms with distributed databases such as Oracle, PostgreSQL, and CockroachDB * Exposure to Kafka and event-driven or streaming data architectures * Familiarity with hybrid environments spanning on-prem and AWS cloud * Experience contributing to platform modernization, automation, or resiliency initiatives. ## Description This role is responsible for the reliability, performance, and availability of Fidelity's mission-critical Mainframe Db2 z/OS database platforms supporting high-volume brokerage and trading applications. As a DBA you will play a hands-on, senior technical role supporting day-to-day database administration operations while also influencing database architecture, replication strategy, and platform modernization., * Support and maintain large-scale Db2 databases on z/OS for business-critical trading and brokerage applications * Design, configure, and maintain low-latency data replication using IBM IIDR (Q Rep / CDC) in Active-Active and Active-Passive architectures * Perform proactive performance analysis and tuning to ensure optimal response times and system stability * Lead troubleshooting and rapid resolution of complex, time-sensitive production issues with a strong sense of ownership and attention to detail * Participate in an on-call rotation to provide 24x7 production support for critical database platforms * Collaborate with application teams, infrastructure partners, and vendors to deliver resilient, scalable database solutions, The Mainframe DBA team manages Fidelity Brokerage's Db2 z/OS database platform and its integration with distributed and cloud-based data ecosystems. The team is responsible for the full database lifecycle - from physical design and replication strategy through deployment, performance optimization, capacity planning, upgrades, patching, and access/security management. We work closely with application partners and enterprise technology teams to ensure Fidelity's core trading platforms remain highly available, scalable, and resilient. ## Related Videos - [Data Fabric in Action - How to enhance a Stock Trading App with ML and Data Virtualization](https://www.wearedevelopers.com/videos/253-data-fabric-in-action-how-to-enhance-a-stock-trading-app-with-ml-and-data-virtualization) - [".Net is too slow" was not an option](https://www.wearedevelopers.com/videos/100176-net-is-too-slow-was-not-an-option) - [Kubernetes and Microservices with Multi-Model Databases](https://www.wearedevelopers.com/videos/382-kubernetes-and-microservices-with-multi-model-databases) - [Fault Tolerance and Consistency at Scale: Harnessing the Power of Distributed SQL Databases](https://www.wearedevelopers.com/videos/1146-fault-tolerance-and-consistency-at-scale-harnessing-the-power-of-distributed-sql-databases) - [Building with IBM Bob](https://www.wearedevelopers.com/videos/100275-building-with-ibm-bob) - [Branch your database like your code: How schema changes and pull requests go hand in hand](https://www.wearedevelopers.com/videos/350-branch-your-database-like-your-code-how-schema-changes-and-pull-requests-go-hand-in-hand) ## Related Articles - [Top Big Data Technologies That You Need to Know](https://www.wearedevelopers.com/magazine/108-top-big-data-technologies-that-you-need-to-know) - [Making Data Warehouses Fast: A Developer’s Story](https://www.wearedevelopers.com/magazine/107-making-data-warehouses-fast-a-developer-s-story) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [Résumé-Driven Development: How IT trends affect the job market for software developers](https://www.wearedevelopers.com/magazine/59-resume-driven-development-how-it-trends-affect-the-job-market-for-software-developers) - [93 Java Interview Questions You Should Prepare For](https://www.wearedevelopers.com/magazine/14-93-java-interview-questions-you-should-prepare-for) - [What Are The Top Skills Required For Azure Developers?](https://www.wearedevelopers.com/magazine/77-what-are-the-top-skills-required-for-azure-developers)