Senior Developer - Mainframe / Assembler

Senior Developer Mainframe / Assembler (z/OS, TPF)

Location: Remote or NEC Region

Duration: 12 Months (Extension Possible)

Position Overview

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

Development Responsibilities

• Legacy system enhancements
• Integration design and implementation
• New service/component development
• System troubleshooting and debugging