Mainframe Programmer – SWIFT & Financial Messaging Platform

At BBH, Partnership is more than a form of ownership—it’s our approach to business and relationships. We know that supporting your professional and personal goals is the best way to help our clients and advance our business. We take that responsibility seriously. With a 200-year legacy and a shared passion for what’s next, this is the right place to build a fulfilling career.

Mainframe Programmer – SWIFT & Financial Messaging Platform Brown Brothers Harriman is seeking an experienced Mainframe Programmer to join our Data Movement Technology team.

This role is ideal for a highly skilled mainframe professional with extensive experience in enterprise transaction processing, COBOL development, DB2, CICS, z/OS, and IBM middleware. While knowledge of SWIFT messaging is beneficial, the primary focus of this position is the support, maintenance, and optimization of mission‑critical mainframe applications that support financial messaging and payment processing operations.

The successful candidate will play a key role in the full software development lifecycle, including analysis, design, coding, testing, implementation, troubleshooting, performance tuning, and production support within a high‑availability mainframe environment. The successful candidate will play a key role in the maintenance, support, and operational stability of business‑critical mainframe applications. Responsibilities will include incident analysis and resolution, production/testing support, performance tuning, monitoring system health, application upgrades, troubleshooting, and ensuring the reliability and availability of high‑volume financial transaction processing systems within a 24x7 environment.

Limited development work may be required to support enhancements, defect remediation, and regulatory or business‑driven changes.

In addition this position also provides an excellent opportunity to expand technical expertise by gaining hands‑on experience with the SWIFT network, financial messaging technologies, and distributed platforms that support BBH's global payment and data movement infrastructure.

Support and maintain critical mainframe applications that support financial transaction processing and messaging. Provide application support using COBOL, JCL, DB2, MQ, CICS and z/OS and technologies. Troubleshoot production issues, perform root‑cause analysis, and ensure system stability. Support, install and administer IBM Financial Transaction Manager (FTM). Monitor application and system performance and implement improvements as needed. Collaborate with operations, infrastructure, database, network, and support teams.

Participate in code reviews and support application enhancements and defect fixes. Create and maintain technical and operational documentation. Follow change management and release processes using tools such as Change Man. Participate in an on‑call rotation to support high availability requirements. Support Business Continuity Planning (BCP) and Disaster Recovery (DR) activities. Support SWIFT Customer Security Programme (CSP) requirements. Contribute to platform reliability, operational efficiency, and modernization initiatives.

10+ years of hands‑on mainframe development and support experience in large‑scale enterprise environments. Strong expertise in: COBOL JCL DB2 CICS MQ z/OS (MVS) Change Man or equivalent source control/change management tools Experience installing, configuring, and supporting IBM software products. Experience with IBM Financial Transaction Manager (FTM) or similar financial transaction processing platforms. Strong SQL, and performance tuning experience within DB2 environments.

Experience troubleshooting complex production issues and conducting…