Abhishek Singh

DevOps / Cloud Consultant (Freelance & Contract)

Upwork • Freelance

Apr 2022 - Present • 4 yrs 6 mos

- Architected and operated multi-cluster EKS and GKE environments supporting 38+ microservices across 3 production clusters with 99.9%+ uptime - Led a zero-downtime EKS → GCP cloud migration for 38 microservices, planning cutover strategy, executing migration in waves, and validating all services post-migration with zero customer impact - Built and owned end-to-end CI/CD pipelines using GitHub Actions, AWS CodeBuild/CodePipeline, Jenkins, and ArgoCD GitOps — reducing deployment time from hours to minutes - Provisioned entire infrastructure as code using Terraform and Ansible across AWS, GCP, OVH, and DigitalOcean - Designed and deployed observability stacks using Prometheus, Grafana, and Loki for metrics/alerting, plus AWS CloudWatch - Responded to production incidents with average resolution time under 4 hours on problems that had previously kept teams stuck for days - Implemented canary and blue-green deployment strategies with automated rollback triggers and documented runbooks, eliminating release-related outages - Delivered incident sprint engagements focused on resolving critical SSL/TLS failures, Kubernetes networking problems, and deployment pipeline failures - Managed multi-cloud production infrastructure with cost optimisation — right-sizing instances, reserved instance planning, and resource cleanup that reduced monthly cloud spend - Re-engaged repeatedly by multiple clients across multiple years — strong indicator of trust and consistent

DevOps Engineer

TechsBiz IT • Temps plein

Apr 2021 - May 2022 • 1 yr 1 mo

- Automated Linux system administration operations using Bash scripting, eliminating manual repetitive tasks and reducing operational errors - Built and maintained Jenkins CI/CD pipelines for application deployment, implementing automated build, test, and deploy workflows - Operated and managed the full AWS infrastructure stack including EC2, VPC, S3, ELB, ASG, EKS, ECS, and ECR — ensuring production availability and performance - Integrated Ansible for configuration management across server fleets, standardizing server configurations and automating software deployments - Transitioned the team's approach from manual "managing servers" to "owning infrastructure as code" — establishing IaC practices and version-controlled infrastructure definitions - Collaborated with development teams to improve deployment processes, reduce deployment failures, and increase infrastructure reliability

Linux System Administrator

Data Ingenious • Temps plein

Sep 2018 - Mar 2021 • 2 yrs 6 mos

- Managed and maintained CentOS/RHEL production servers handling application hosting, ensuring system availability, security, and performance - Configured and administered Tomcat virtual hosts for Java-based application deployment, managing multiple web applications on shared infrastructure - Set up and maintained PostgreSQL replication for high availability, implementing master-slave replication configurations for failover capability - Installed and configured SSL certificates on Java-based web applications, enabling HTTPS encryption and securing data in transit - Migrated infrastructure operations to AWS cloud services including EC2, VPC, ELB, ASG, and CloudWatch — moving from on-premises to cloud infrastructure - Learned and applied core principles of availability and redundancy — designing systems to remain operational under real load with failover mechanisms - Monitored system health and performance using CloudWatch alerts and logs, proactively identifying and resolving issues before they impacted users