EY - GDS Consulting - Mainframe Modernization- GEN AI - Senior

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AIA – Mainframe Modernization Specialist

The opportunity

We are seeking a skilled Senior Mainframe Modernization Specialist to join our AI-Driven Modernization practice, focused on transforming legacy mainframe systems into agile, efficient, and cloud-ready platforms. The ideal candidate will bring a strong blend of mainframe expertise, AI tools proficiency, and cloud technologies along with hands-on collaboration with cross-functional teams to deliver scalable modernization outcomes.

You will work closely with technology leads, architects, and business stakeholders to analyse legacy applications, leverage AI/ML to automate code analysis and refactoring, and execute migration of mainframe workloads to modern distributed and cloud-native platforms.

Your key responsibilities

Technical Excellence:

• Mainframe Systems Analysis and Understanding

• • Assess and analyse existing mainframe applications (COBOL, JCL, VSAM, DB2, CICS, IMS) to identify modernization opportunities and dependencies.
  • Document current-state architecture, data flows, batch schedules, and integration points across legacy ecosystem components.
  • Perform impact analysis and complexity assessment for potential transitions to modern platforms.

• AI-Driven Mainframe Modernization

• • Apply AI tools and custom AI agentic workflows for automated code analysis, refactoring, and technical debt reduction.
  • Develop and fine-tune AI-powered assistants to accelerate system conversion and code translation (e.g., COBOL to Java/Python).
  • Apply prompt engineering and context engineering techniques to maximise accuracy and efficiency of LLM-driven modernization workflows.

• Modernization Execution

• • Execute modernization tasks including rehosting, refactoring, or rebuilding mainframe workloads based on defined strategies.
  • Participate in the design and implementation of target-state architectures aligned with cloud-native and microservices patterns.
  • Ensure code quality, testability, and maintainability throughout the modernization lifecycle.

• API and Microservices Development

• • Contribute to the design and development of API integrations and microservices to replace or wrap legacy mainframe functionality.
  • Implement RESTful APIs, event-driven architectures, and integration patterns as part of the target-state solution.

• Cloud and Platform Integration

• • Support migration of mainframe workloads to cloud platforms (AWS, Azure, Google Cloud) using AI-driven solutions.
  • Integrate modernized components with cloud-native services, containerised workloads (Docker, Kubernetes), and CI/CD pipelines.
  • Familiarity with infrastructure-as-code, observability, and security best practices for modernized workloads.

• Documentation and Reporting

• • Create and maintain technical documentation including system designs, migration runbooks, and AI pipeline configurations.
  • Provide regular status updates on modernization progress, risks, and deliverables to project leads.

Skills and Attributes:

Educational Background

• B.Tech / B.E. / MCA / M.Tech or equivalent degree in Computer Science, Information Technology, or a related field.

Professional Experience

• 5 to 9 years of hands-on experience with legacy mainframe systems (COBOL, JCL, Assembler, CICS, DB2, IMS, VSAM).
• Experience with data migration, integration, ETL processes, and at least one major cloud platform (AWS, Azure, or Google Cloud).
• Proficiency in programming/scripting languages such as Python and/or Java.
• Working knowledge of APIs, microservices architecture, and containerization tools (Docker, Kubernetes).
• Hands-on experience with AI tools, LLM API calls, prompt engineering, and context engineering for automating code analysis and modernization workflows.
• Experience with mainframe modernization tools or platforms (e.g., Micro Focus, AWS Mainframe Modernization, Azure Migrate) is a plus.

Soft Skills

• Strong analytical and problem-solving skills with attention to detail.
• Effective communication and collaboration skills to work with cross-functional teams.
• Ability to translate complex technical concepts into clear documentation and presentations.

Preferred Certifications

• Cloud certifications (AWS, Azure, GCP), AI/ML certifications, or mainframe-related certifications are a plus.

Why Join Us

• Be at the forefront of AI-driven mainframe modernization across enterprise clients.
• Work with global teams to drive real business impact through digital transformation.
• Collaborate with a team of modernization experts, AI specialists, and technology leaders in a highly innovative environment.

What we offer

EY Global Delivery Services (GDS) is a dynamic and truly global delivery network. We work across six locations – Argentina, China, India, the Philippines, Poland and the UK – and with teams from all EY service lines, serving our clients locally and globally with innovation and at scale.

• Continuous learning: You'll develop the mindset and skills to navigate whatever comes next.
• Success as defined by you: We'll provide the tools and flexibility, so you can make a meaningful impact, your way.
• Transformative leadership: We'll give you the insights, coaching and confidence to be the leader the world needs.
• Diverse and inclusive culture: You'll be embraced for who you are and empowered to use your voice to help others find theirs.

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