Senior Developer – Mainframe / Assembler

Company Description

Lumen Solutions Group Inc. is a technology consulting Services company based in Florida. We provide a wide array of experienced business and IT professionals supporting clients from solution design to implementation and support. We specialize in professional IT consulting services, IT Staffing, Business/IT Strategy, Business Process Blueprints, Enterprise Architecture, Enterprise Transformation. Role: Senior Developer – Mainframe / Assembler (z/OS, TPF) Location: Remote or NEC Region Job Type: Long Term Contract Job Summary: Client is seeking a Senior Developer with deep experience in IBM z/OS mainframe environments, specifically working with Assembly language and C/C++. The developer will support and enhance a critical legacy application primarily written in Assembler, while also contributing to system integrations and new service development. This role requires strong experience working with mainframe-based transportation or enterprise systems, along with the ability to analyze complex systems and design integration solutions across multiple platforms. Primary Responsibilities: - Enhance and maintain an existing mission-critical mainframe application written primarily in Assembler. - Perform system analysis and propose technical design solutions. - Develop and maintain components in Assembler and C/C++. - Design and implement integrations between legacy systems and enterprise services. - Develop and support API integrations as both a producer and consumer. - Work with messaging systems such as IBM MQ. - Build and maintain file-based integrations including SFTP-based data exchanges. - Support database interactions with DB2. - Collaborate with architecture and engineering teams to modernize and extend legacy systems. Required Technical Skills: - Mainframe Environment: IBM z/OS - Experience with TPF-based systems - Programming Languages: Assembly (Primary language), C, C++ - Integration Technologies: Experience working with enterprise integrations such as: - DB2 databases - REST or enterprise APIs - IBM MQ messaging - File-based integrations - SFTP data transfers - Developmental Responsibilities: - Legacy system enhancements - Integration design and implementation - New service/component development - System troubleshooting and debugging Lumen Solutions Group Inc is an equal opportunity employer. All qualified applicants will be considered for employment without regard to any legally protected status.