# Karthikeyan Sundaram

> Software Engineer at NatWest Group (RBS)

Location: London Area, United Kingdom, United Kingdom
Profile: https://flows.cv/karthikeyan

## Work Experience
### Software Engineer @ NatWest Group
Jan 2025 – Present | Greater London, England, United Kingdom

### Senior Mainframe Engineer @ Tata Consultancy Services
Jan 2022 – Jan 2025 | Edinburgh, Scotland, United Kingdom
Mainframe Lead Engineer in Cards and Wallet Pay platform.
Technical expertise in z/Os platform.
Proven record and experience in delivering system design, application development and testing.
Have built a few Java modules for sensitive data's Encryption and bundled (OSGI) them to deploy in CICS regions.
Expertise in Software Development Lifecycle and architectural designs.
Developing and maintaining high-quality scalable RESTful APIs in z/OS for Debit Tokens life cycle management.
Performed Impact Analysis on the complex business applications.
Ability to understand the business requirements and convert them into high quality technical requirement document and break down technical problems.
As a Lead engineer, debugged and reviewed the code written by other team members.
 Proficiency in DB2 development, maintenance and building DevOps pipelines.
Experience in creating all Jira tasks and acceptance criteria for accomplishing a project end-to-end.
 Experience in continuous integration/ continuous delivery methodology.
Responsible for maintaining the operational stability of the application I'm working with. 
Demonstrated Technical expertise and leadership qualities in modernizing legacy, critical and highly available application.
Conversancy with SOAP (WSDL) and JSON REST APIs in z/OS.
Application steward to ensure controls are applied and reviewed periodically to lead to compliance.
Have experience in conducting workshops with internal and external stakeholders.
Understanding of Middleware, SOA, Data Power, F5 Load Balancer, Internal and External API-Gateway.
Insight into change management and source code management tool.

### Mainframe Engineer @ Tata Consultancy Services
Jan 2020 – Jan 2022
Have driven the technical design of a major migration project and coordinated with end-to-end implementation.
Co-ordinated in creating a shadow schema to the production database, thus pilot of migration accessed the parallel schema to safeguard the existing customer data.
Successfully implemented innovative solution business cases that run, manage and optimize clients’ key business processes.
Ability to operate independently with correct direction to provide high-quality deliverables.
Resolved issues in CICS transaction abends and fine tuned DB2 queries to improve transaction performance and saving MIPS.
Have built good relationship with platform and other domain stakeholders.
Familiarity in Change Management process and tools.

### Senior Software Developer @ Tata Consultancy Services
Jan 2017 – Jan 2020
Worked as a Senior Developer in the Cards & Wallet Pay.

### Senior Software Engineer @ Tata Consultancy Services
Jan 2017 – Jan 2017 | Edinburgh, Scotland, United Kingdom
Built numerous CICS programs for the Card transaction control journey which allows customers to use their debit card as they want to.

### Senior Software Engineer @ Tata Consultancy Services
Jan 2015 – Jan 2017 | Chennai, Tamil Nadu, India
Designed and built Batch ADs to satisfy business requirements and to transmit files to other upstream/downstream applications.

### Senior Software Engineer @ HCL Technologies
Jan 2014 – Jan 2015
Worked in developing Cobol DB2 Components for Insurance annuity products.
Created a new batch process required as per high-level design
Have supported the code deployment into production and provided developer support for system integration testing

### Software Engineer Intern and Junior Developer @ Wipro Technologies
Jan 2011 – Jan 2014
Enhanced the existing programs and unit tested
Developed a medium complex level programs and taken care of the system test support
Developed Stored procedures to deliver customer needs
Have involved in designing the CICS screens for internal transactions


## Education
### Bachelor’s Degree in Computer Science
Anna University Chennai

### High School
GHSS SOMANGALAM


## Contact & Social
- LinkedIn: https://linkedin.com/in/karthikeyan-sundaram-41897a61

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Source: https://flows.cv/karthikeyan
JSON Resume: https://flows.cv/karthikeyan/resume.json
Last updated: 2026-04-05