Karthick Krishnasamy
Edinburgh,United Kingdom
Summary
Knowledgeable engineering professional with background in fault diagnostics, project planning and quality assurance. Approachable, helpful and supportive team player. Implements projects using Waterfall and Agile methodologies. Innovative Engineer with knack for solving complex problems and driving project success. Spearheaded multiple projects that improved operational efficiency and reduced costs. Known for exceptional teamwork and leadership, delivering high-quality results in demanding environments.
Overview
12
12
years of professional experience
4
4
years of post-secondary education
1
1
Certification
Work history
Mainframe Modernisation Engineer
Lloyds Banking Group
Edinburgh
08.2023 - 01.2026
- Supported enterprise-wide DevOps transformations through scalable containerisation and orchestration practices using Docker and Kubernetes to enhance deployment speed and reduce downtime.
- Assisted stakeholders with automation, cloud adoption, and delivery pipelines, fostering improved alignment among DevOps teams.
- Facilitated the management of CI/CD pipelines using AWS CodePipeline, CodeBuild, CodeDeploy, Jenkins, CircleCI, GitHub, ArgoCD, and Nexus Repository to ensure secure release processes across diverse environments.
- Integrated version control systems like Git into development workflow, enhancing code management practices.
- Coordinated cross-functional teams to deliver complex projects on schedule.
- Collaborated with software developers to streamline DevOps processes.
- Facilitated seamless software releases through Jenkins CI and CD pipeline.
- Managed multiple projects, ensuring timely completion and high-quality work.
Data Migration & Modernisation Specialist
Lloyds Banking Group
Edinburgh
08.2020 - 08.2023
- Delivered one of the UK's largest strategic data migration programs, ensuring seamless execution, on-time delivery, and minimal service disruption during complex transitions from legacy systems.
- Designed and executed end-to-end data migration strategies, including robust ETL frameworks aligned with both business goals and technical constraints.
- Directed the development of CI/CD pipelines leveraging Jenkins, custom automation, and SQL scripting to efficiently extract, transform, and load data from mainframe systems.
- Implemented automated data reconciliation and quality assurance checks, achieving 99%+ accuracy in migrated datasets across multiple test and production cycles.
- Applied deep expertise in mainframe modernization tools and techniques to optimize performance, streamline transformation and ingestion workflows, and reduce operational costs.
- Orchestrated and executed mock runs and cutover activities to validate E2E data migration reliability, ensuring readiness and minimizing risks during go-live.
- Collaborated with cross-functional teams and senior stakeholders to define and refine data migration requirements, operating under Agile delivery frameworks.
- Delivered executive-facing dashboards, progress reports, and risk assessments, ensuring transparency and alignment with leadership on migration status and milestones.
Mainframe DevOps Engineer
Lloyds Banking Group
Edinburgh
06.2018 - 08.2020
- Spearheaded the modernization of legacy mainframe delivery by implementing DevOps tools and practices, accelerating development, testing, and deployment cycles for COBOL, IMS, and DB2 applications.
- Architected and maintained CI/CD pipelines using Jenkins, UrbanCode Deploy, Git, SonarQube, and Topaz, enabling automated, reliable deployments across mainframe environments.
- Led the migration of legacy systems to cloud infrastructure, resulting in improved system performance and increased operational efficiency.
- Automated code builds, unit testing, and multi-LPAR deployments, significantly reducing manual effort and shortening time-to-production.
- Implemented CI/CD pipelines with Jenkins and Git, enabling automated deployments and reducing time-to-production significantly.
- Successfully integrated mainframe systems into enterprise DevOps toolchains, enabling cross-platform delivery pipelines aligned with modern development practices.
- Drove shift-left testing by embedding static code analysis, automated unit testing, and quality gates into mainframe CI/CD workflows, improving code quality and early defect detection.
- Led the adoption of version control for mainframe source code, and implemented proactive monitoring and alerting for batch and online jobs via integration with enterprise observability platforms.
- Mentored developers and DevOps engineers on mainframe automation tooling and agile DevOps principles, cultivating a high-performance culture focused on speed, quality, and collaboration.
- Enhanced project agility by adopting Agile and Scrum methodologies.
Lead mainframe Developer
Lloyds Banking Group
Edinburgh
10.2013 - 06.2018
- Conducted regular code reviews to maintain coding standards across all projects.
- Followed strict compliance protocols during development phase ensuring secure handling of sensitive data.
- Managed code migrations, resulting in seamless system upgrades.
- Coordinated successfully within cross-functional teams for end-to-end solution delivery.
- Optimised existing code to improve overall efficiency and reduce processing time.
- Designed sophisticated database structures to enhance system performance.
- Facilitated smooth transition from legacy systems by developing efficient migration plans.
- Streamlined processes through automation, reducing manual labour significantly.
- Worked closely with stakeholders to understand their needs and translate them into technical solutions.
- Maintained up-to-date knowledge about mainframe technologies, contributing towards continuous improvement initiatives.
- Ensured high quality software delivery with meticulous testing and debugging processes.
Education
Bachelors in Engineering - Electronics & Instrumentation Engineering
Government College of Technology
India 06.2009 - 04.2013
Skills
- Containerization & Orchestration:
- Kubernetes, Docker, Amazon ECS, Amazon EKS
- Designed scalable, efficient deployment strategies using container technologies
- DevOps & CI/CD Tooling:
- CI/CD: Jenkins (Groovy), CircleCI, GitLab CI, ArgoCD, UrbanCode Deploy
- Version Control: Git, GitHub
- Code Quality & Security: SonarQube
- Infrastructure as Code: Terraform, AWS CloudFormation
- Scripting & Automation: Python, Bash, PowerShell
- Cloud Platforms & Services (AWS):
- Compute & Storage: EC2, S3, RDS, Lambda
- Networking: VPC, Subnets, Route Tables, Load Balancers, Security Groups
- IAM & Security: IAM, AWS KMS, AWS Shield, AWS WAF
- Monitoring & Logging: CloudWatch, CloudTrail
- Monitoring & Observability:
- Grafana, Dynatrace
- Data Engineering & Migration:
- Mainframe to Cloud Data Migration
- ETL, Data Warehousing on Mainframe
- Performance Tuning and Optimization
- Mainframe Modernization:
- Tools: Topaz Workbench, Zowe
- DevOps Integration for COBOL/IMS/DB2-based applications
- Site Reliability Engineering (SRE):
- Proficient in SRE principles including SLAs, SLOs, error budgets, and reliability automation
- Leadership & Decision-Making
- Strategic Decision-Making
- Team Management & Mentorship
- Technical Guidance & Coaching
- Proactive Ownership of Initiatives
- Collaboration & Communication
- Cross-Functional Team Collaboration
- Clear and Effective Communication
- Strong Team Player
- Collaborative, Focused, and Adaptable
- Analytical Thinking & Problem Solving
- Strong Analytical and Troubleshooting Skills
- Results-Oriented Mindset
- Multitasking & Prioritization under Pressure
Certification
- Driven complex, large-scale data migration programs for Life & Pensions products, successfully modernizing the mainframe estate using Agile delivery and DevOps tools, significantly improving time-to-market and deployment efficiency.
- Cloud-Certified in GCP, demonstrating multi-cloud proficiency in architecture, deployment, and cost-optimized cloud operations.
- Experienced in both Waterfall and Agile methodologies including Kanban, Scrum, and Professional Scrum Master (PSM) frameworks, enabling delivery agility across diverse project scopes.
- Proficient in Incident, Problem, and Change Management, consistently ensuring high service availability and SLA compliance. Certified in ITIL and Lean Six Sigma, bringing a structured, process-driven approach to operations.
- Strong cross-functional collaborator, known for translating technical concepts for non-technical stakeholders, providing clear guidance, and fostering alignment between development, operations, and business teams.
Timeline
Mainframe Modernisation Engineer
Lloyds Banking Group
08.2023 - 01.2026
Data Migration & Modernisation Specialist
Lloyds Banking Group
08.2020 - 08.2023
Mainframe DevOps Engineer
Lloyds Banking Group
06.2018 - 08.2020
Lead mainframe Developer
Lloyds Banking Group
10.2013 - 06.2018
Bachelors in Engineering - Electronics & Instrumentation Engineering
Government College of Technology
06.2009 - 04.2013