Mark John T.

AWS DevOps engineer specializing in Terraform, CI/CD pipelines, and legacy modernization for SaaS teams. I help companies cut infrastructure risk, speed up deployments, and replace fragile legacy setups with automated, IaC-managed AWS environments. Most of my work is one of three things: replacing shared or manual infrastructure with Terraform-managed AWS stacks, containerizing legacy applications, or building CI/CD pipelines that reduce deployment risk. I handle projects from architecture through production delivery. Recent work: Led a client migration from shared tenancy to a standalone AWS stack, including moving from shared RDS to dedicated RDS instances using AWS DMS. Cut manual deployment work and improved release reliability by implementing GitHub Actions pipelines. Currently containerizing a legacy PHP application while upgrading from PHP 7 to PHP 8 for performance and security. Built Terraform modules for multi-account AWS environments with least-privilege IAM and secure S3 configurations. Designed monitoring and alerting for containerized ECS services to improve incident response time. Skills: Cloud Infrastructure: AWS, Amazon ECS, Amazon EKS, Amazon EC2, Amazon RDS, Amazon S3, ElastiCache, Route 53, IAM, VPC Networking Infrastructure as Code: Terraform, remote state management, modular design, least-privilege IAM policies, secure S3 configurations CI/CD and GitOps: GitHub Actions, Bitbucket Pipelines, ArgoCD, automated testing, vulnerability scanning, zero-downtime deployments Containers: Docker, Docker Compose, ECS task definitions, image optimization, runtime security DevSecOps: Policy-as-code, secrets management, pipeline security, supply-chain scanning Observability and SRE: Prometheus, Grafana, OpenTelemetry, SLI/SLO design, incident response, monitoring, logging, alerting Linux and Scripting: Ubuntu and CentOS administration, Bash, Python, service hardening, performance tuning, kernel-level troubleshooting Legacy Modernization: Shared-to-standalone migrations, RDS to dedicated RDS with DMS, PHP 7 to PHP 8 upgrades, application containerization FinOps: Cloud cost optimization, right-sizing, tagging strategy, budget alerts Background: Earlier in SaaS technical support, I worked directly with customers on cloud-hosted application reliability. That experience shapes how I build infrastructure: reliable, observable, and focused on real user expectations. If you need help turning a legacy system into a modern, automated, Terraform-managed platform, send me a message with a short description of your setup.