Karthikeyan Manoharan

Karthikeyan Manoharan

Senior DevOps Engineer
United Kingdom

About Me

Experienced DevOps and Cloud Architect/Engineer with over 18 years of expertise in designing, implementing, and managing complex cloud infrastructures. Proven track record in leading teams, implementing CI/CD pipelines, …

Experience

Lead Cloud Engineer (Contract)

The Royal Bank of Scotland (RBS) / Natwest
Apr 2025 - Present · 1 year 3 months

Specialized in hybrid cloud solutions using AWS and GCP.
Worked with Apigee X Hybrid management console in GCP GKE integrated with runtime/worker nodes in AWS EKS.
Architected Apigee API platform with OAuth/JWT/mTLS policies, rate limiting, and threat protection.
Integrated Apigee with GCP services including Pub/Sub, Cloud Functions, and BigQuery.
Designed, implemented, and managed complex cloud infrastructures with focus on security, scalability, and observability.
Used Terraform Cloud and Terraform Enterprise for GKE cluster provisioning and Apigee deployments.
Used Docker, Kubernetes (GKE/EKS), ECS, and ECR for containerization.
Configured Apigee proxies/policies and GCP service integrations.
Built GitOps platform for EKS/GKE namespaces using ArgoCD.
Automated Apigee lifecycle with Jenkins pipelines.
Applied security controls including GuardDuty, CloudTrail, Kyverno policy-as-code, IAM least-privilege, encryption in transit and at rest, and vulnerability scanning with Sonatype IQ and Trivy.
Monitored systems with CloudWatch, Prometheus, and OpenTelemetry across AWS/GCP.
Created SLO/SLI dashboards for API performance monitoring.
Used Istio for secure API traffic management.
Worked with VPC/VPN/Transit Gateway and GCP Cloud Load Balancing/CDN.
Implemented Karpenter/KEDA, blue-green deployments, and DR runbooks with RTO/RPO validation.
Deployed cross-cloud Apigee Hybrid solution with GCP GKE management plane and AWS EKS runtime nodes.
Automated Apigee proxy/policy deployments via Terraform Cloud CI/CD pipelines.
Implemented API security controls compliant with financial regulations.
Integrated Apigee analytics with Google Cloud Monitoring for performance visibility and compliance auditing.

Lead Cloud Engineer (Contract)

The Royal Bank of Scotland (RBS) / Natwest
Apr 2025 - Present · 1 year 3 months

Experienced Lead Cloud Engineer specializing in hybrid cloud solutions using AWS and GCP, Architected Apigee API platform with OAuth/JWT/mTLS policies, rate limiting, threat protection, Proficient in designing, implementing, and managing complex cloud infrastructures with focus on security, scalability, and observability

Lead DevOps Engineer (Asst. Vice President)

Barclays Execution (BFL) UK
Feb 2019 - May 2024 · 5 years 3 months

Led cloud architecture and DevOps initiatives with AWS, Azure, GCP, OpenShift, and Kubernetes.
Orchestrated multi-cloud container platform innovations and microservices development.
Established cross-cloud CI/CD pipelines and infrastructure-as-code practices.
Built Jenkins, Groovy, and Shared Libraries pipelines with Maven/NPM packaging.
Integrated SonarQube for SAST scanning.
Used Artifactory and Nexus for artifact management.
Integrated Veracode and Checkmarx for DAST.
Used Prism, Trivy, and Sonatype IQ for container vulnerability scanning.
Optimized observability, performance, and disaster recovery strategies across multiple cloud platforms.
Led hybrid and multi-cloud orchestration efforts across AWS, Azure, and GCP.
Mentored junior engineers on secure coding practices, multi-cloud strategies, Kubernetes, and OpenShift best practices.
Incorporated SBOM-style artifact tracking and hash/digest validation into enterprise CI/CD pipelines.
Architected multi-cloud infrastructure using AWS EKS, Azure AKS, GCP GKE, and OpenShift v3/v4.
Used AWS VPC, Azure VNet, GCP VPC, and OpenShift SDN for secure network environments.
Designed storage solutions with AWS S3, Azure Blob Storage, Google Cloud Storage, and OpenShift persistent storage.
Implemented serverless architectures using AWS Lambda, Azure Functions, Google Cloud Functions, and OpenShift Serverless.
Containerized Java-based banking applications.
Developed microservices using Amazon ECS, Azure Container Instances, Google Cloud Run, Kubernetes, and OpenShift Service Mesh.
Enforced container security with SecurityContext Constraints, Pod Security Policies, and cloud-native security tools.
Implemented NetworkPolicies and cloud-specific network security groups.
Established CI/CD pipelines using AWS CodePipeline, Azure DevOps, Google Cloud Build, and OpenShift Jenkins, Groovy, Shared Libraries, and Plugins.
Implemented secure container image pipelines using AWS ECR, Azure Container Registry, and Google Container Registry.
Ensured artifact integrity as part of SLSA-oriented workflows and CycloneDX SBOM-generation pipelines.
Developed PowerShell and Bash scripts for cross-platform system automation and integration with legacy banking systems.
Implemented AWS Systems Manager, Azure Automation, and Google Cloud Operations for automated patch management.
Introduced ArgoCD as a GitOps deployment controller for Kubernetes and OpenShift workloads.
Migrated banking applications from manual/CI-driven kubectl deployments to ArgoCD.
Set up monitoring with CloudWatch, Azure Monitor, Google Cloud Monitoring, Prometheus, and OpenShift monitoring stack.
Used Prometheus, Grafana, AlertManager, ELK Stack, CloudWatch, Azure Monitor, Google Cloud Monitoring, Splunk, AppDynamics, Datadog, and OpenTelemetry for observability.
Implemented blue-green deployments using AWS Route53, Azure Traffic Manager, and Google Cloud Load Balancing.
Leveraged AWS X-Ray, Azure Application Insights, Google Cloud Trace, and Jaeger for distributed tracing.
Managed secrets with AWS Secrets Manager, Azure Key Vault, Google Secret Manager, OpenShift Secrets, and HashiCorp Vault.
Designed hybrid cloud solutions with AWS Direct Connect, Azure ExpressRoute, Google Cloud Interconnect, and OpenShift multi-cluster management.
Implemented event-driven architectures using Kafka on OpenShift.
Optimized cluster utilization with cloud-specific cost management tools and OpenShift resource quotas.
Set up automated backup and restore procedures with cloud-native backup solutions and Velero for OpenShift.
Designed and implemented failover strategies using cloud-specific high availability services and OpenShift etcd cluster.

Lead DevOps Engineer (Asst. Vice President)

Barclays Execution (BFL) UK
Feb 2019 - May 2024 · 5 years 2 months

Innovative problem-solver spearheading cloud architecture and DevOps initiatives with AWS, Azure, GCP, OpenShift, and Kubernetes, Strategic thinker orchestrating Multi-cloud container platform innovations and microservices development, Hands-on leader establishing cross-cloud CI/CD pipelines and implementing infrastructure-as-code practices

Lead Infrastructure DevOps Engineer

Barclays Global Service Centre Private Limited
Aug 2012 - Feb 2019 · 6 years 6 months

Implemented and configured CI/CD tools including Jenkins, JFrog Artifactory, Nexus, and SonarQube.
Set up and maintained CI/CD pipelines using GitHub and CircleCI.
Integrated Veracode, Checkmarx, SonarQube, and Fortify into CI/CD pipelines.
Containerized applications using Docker and managed Kubernetes clusters.
Utilized OpenShift v2, v3, and v4 for container orchestration.
Developed and maintained infrastructure using Terraform across multiple cloud providers.
Designed and implemented scalable solutions using AWS services.
Managed application servers including WebSphere, JBoss EAP, Nginx, Apache HTTP Server, and iPlanet Web Server.
Administered databases including Oracle, MySQL, MongoDB, and SQL Server.
Leveraged VMware for virtualization needs.
Implemented Docker for containerizing applications.
Deployed and managed Kubernetes clusters for orchestrating containerized applications.
Developed and maintained infrastructure using Terraform.
Implemented IaC practices across multiple cloud providers.
Optimized cloud resource utilization and implemented cost-saving measures.
Ensured high availability and fault tolerance in cloud-based architectures.
Set up Jenkins master-slave architecture, created custom pipelines, and integrated with plugins.
Configured JFrog Artifactory repositories and artifact promotion strategies.
Set up Nexus repository management and security policies.
Configured SonarQube quality gates and custom rules.
Automated build, test, and deployment processes.
Implemented Veracode, Checkmarx, SonarQube, and Fortify for code analysis.
Configured Maven multi-module projects and dependency management.
Implemented NPM package management and script automation.
Configured Gradle build scripts and custom tasks.
Streamlined development processes to enhance collaboration between development and operations teams.
Implemented monitoring and logging solutions to improve system reliability and troubleshooting.
Established feedback loops for continuous improvement.
Implemented Confluence knowledge management system.
Implemented JIRA project management workflows and automated reporting.
Configured Fisheye code review processes.
Set up Bitbucket repositories, branching strategies, and access controls.
Implemented Crucible peer code review processes.
Integrated Atlassian suite with CI/CD pipeline.
Utilized Bower for front-end package management.
Implemented Grunt for task automation.
Managed and optimized WebSphere Application Server, JBoss EAP, Nginx, Apache HTTP Server, and iPlanet Web Server.
Administered and optimized Oracle Database, MySQL, MongoDB, and SQL Server.
Deployed and configured Snort for network intrusion detection.
Utilized Snorby for security event management and visualization.
Implemented IBM MQ queue managers, channels, and clustering.
Set up RabbitMQ exchanges, queues, message persistence, and routing strategies.
Ensured seamless integration of message brokers in CI/CD pipelines.
Developed robust and scalable applications using Spring Framework.
Implemented Hibernate ORM for efficient database operations.
Built web applications using Struts MVC architecture.
Developed component-based user interfaces with JSF.
Developed and consumed SOAP-based web services.
Designed and implemented RESTful APIs for microservices architecture.
Built scalable network applications with Node.js.
Implemented scripts and applications with Python.

Lead Infrastructure DevOps Engineer

Barclays Global Service Centre Private Limited
Aug 2012 - Feb 2019 · 6 years 6 months

Implemented and configured CI/CD tools including Jenkins, JFrog Artifactory, Nexus, and SonarQube, Set up and maintained CI/CD pipelines using GitHub and CircleCI, Containerized applications using Docker and managed Kubernetes clusters

Senior Software Engineer

PRIMUS Global Services
May 2011 - Aug 2012 · 1 year 3 months

Designed and developed Java-based web and mobile applications for banking sector clients.
Implemented Struts-Java-AJAX-DWR based RMDB Web Application.
Integrated Oracle database and RabbitMQ middleware for efficient data management and system decoupling.
Designed and implemented CI/CD pipelines for bank and client projects.
Designed and developed Java-based web and mobile applications for banking sector clients including Barclays and Tech Mahindra.
Implemented responsive design principles.
Used Java, JSP, Servlets, and modern front-end technologies.
Designed and developed a Struts-Java-AJAX-DWR based RMDB Web Application.
Implemented MVC pattern for master and query screens using Java, JSP, Servlets, and Struts Framework.
Successfully deployed the application in production.
Ensured application performance and scalability in AIX and Windows environments.
Integrated Oracle database for efficient data management and retrieval.
Optimized database queries and implemented proper indexing.
Integrated RabbitMQ middleware in banking applications.
Implemented message queuing to improve system decoupling and scalability.
Designed and implemented CI/CD pipelines for bank and Tech Mahindra client projects.
Automated build, test, and deployment processes.
Integrated version control systems, automated testing frameworks, and deployment tools into the CI/CD workflow.
Prepared and managed project schedules.
Led and participated in conference calls to track project status and provide updates to stakeholders.
Worked closely with UX/Designers to implement intuitive user interfaces.
Collaborated with QA teams to establish testing protocols.
Coordinated with operations teams to streamline deployment processes and minimize downtime.
Conducted performance testing and optimization of web applications.
Implemented caching strategies and database query optimization.
Utilized profiling tools to identify and resolve performance bottlenecks.
Implemented secure coding practices to protect against common web vulnerabilities.
Integrated security testing into the CI/CD pipeline.
Created comprehensive technical documentation.
Conducted knowledge transfer sessions with team members and clients.

Senior Software Engineer

PRIMUS Global Services
May 2011 - Aug 2012 · 1 year 3 months

Designed and developed Java-based web and mobile applications for banking sector clients, Implemented Struts-Java-AJAX-DWR based RMDB Web Application, Integrated Oracle database and RabbitMQ middleware for efficient data management and system decoupling

Information Technology Lead

Questia
Feb 2009 - May 2011 · 2 years 3 months

Led design, development, and marketing of web applications.
Managed IT logistics and ISO certifications.
Streamlined processes for web app development.

Information Technology Lead

Questia
Feb 2009 - May 2011 · 2 years 2 months

Led design, development, and marketing of web applications, enhancing user engagement, Managed IT logistics and ISO certifications, ensuring compliance and operational efficiency, Streamlined processes for web app development, resulting in measurable productivity gains

Senior Software Engineer

Softeon
Jan 2007 - Jan 2009 · 2 years

Developed Java WebApps and handheld device apps for warehouse sector clients including Yahoo, Sony-Elite, Lenovo, Hoffman Beverage, and Sears.
Utilized JSP, Servlets, Java, JavaScript, Ajax, Oracle DB, and WebLogic for application development.
Worked with Oracle WebLogic Server and Eclipse IDE.
Managed communication between project team and customers.
Provided regular status updates and ensured client satisfaction.
Coordinated 24/7 production support from offshore teams.
Prepared and delivered weekly and monthly reports to stakeholders.
Assigned tasks, monitored progress, and ensured timely delivery of project milestones.
Conducted training sessions and mentored new team members.
Collaborated with cross-functional teams to meet project objectives.

Senior Software Engineer

Softeon
Jan 2007 - Jan 2009 · 2 years

Developed Java Web Apps and Handheld device Apps for warehouse sector clients including Yahoo, Sony-Elite, Lenovo, Hoffman Beverage & Sears, Utilized JSP, Servlets, Java, JS, Ajax, Oracle DB, and Weblogic for application development, Managed effective communication between project team and customers, providing regular status updates and ensuring client satisfaction

Certifications

MICROSOFT Certified AZURE Fundamentals AZ-900

MICROSOFT · London, UK · 2024

Scrum Certified

SCRUM study- Accreditation Body for Scrum and Agile · London, UK · 2019

Amazon AWS Certified Solutions Architect - Associate(SAA)

AWS · London, UK · 2017

Amazon AWS Certified DevOps Engineer - Professional(DOP)

AWS · London, UK · 2017

Amazon AWS Certified Solutions Architect -Professional (SAP),

AWS · London, UK · 2017

Amazon AWS Certified SysOps Administrator - Associate(SOA)

AWS · London, UK · 2015

Skills

Java Maven MySQL Oracle PostgreSQL Python Scrum Virtual Private Network (VPN) Agile Azure Bitbucket EBS GitHub GitLab NFS React.js Selenium SLI Amazon Web Services (AWS) Docker Google Cloud Platform (GCP) Gradle Groovy Jenkins Kafka Kubernetes MongoDB Node.js PowerShell S3 Splunk Terraform OpenShift Terragrunt Helm IAM EC2 VPC EKS AWSMGN Cloud Migration Factory EFS RDS Lambda Fargate Elastic Load Balancing CloudFront WAF AWS Shield KMS AWS Secrets Manager SQS SNS EventBridge API Gateway Mesh ElastiCache CloudTrail AWS Config Systems Manager Chaos Engineering Google Kubernetes Engine Cloud Build Container Registry Compute Engine Cloud Storage Deployment Manager Apigee Hybrid Control Cloud Load Balancing Cloud CDN Cloud KMS Secret Manager Apigee API Management IaC Shared Libraries GitOps ArgoCD GitLab CI/CD AWS CodePipeline Azure DevOps SonarQube npm Ant Gant Prometheus Grafana AlertManager ELK Stack CloudWatch OTel Azure Monitor Google Cloud Monitoring AppDynamics Datadog AWS Bedrock OpenSearch Test Plugins Site Reliability Engineering SLO Azure Kubernetes Service Azure Container Registry Azure Pipelines Azure App Service Azure Container Instances Azure Blob Storage Virtual Network Application Insights Log Analytics ARM Git Azure Repos svn clearcase perforce Spring Boot Bash Dynamo DB CosmosDB Google Cloud Spanner RabbitMQ IBMMQ Amazon SQS Azure Service Bus Google Cloud Pub/Sub Amazon FSx for Lustre Azure NetApp Files Google Cloud Filestore GKE AKS Transit Gateway AWS MGN Fault Injection Simulator
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