DENNIS CHIMEZIE SUNDAY

Led the secure cloud deployment of a 3-tier banking application on AWS, managing EC2 provisioning, VPC configuration, Security Groups, and IAM roles for least-privilege access control.

Configured distinct production and staging environments, enabling safe, repeatable deployments with defined rollback procedures to minimize downtime and ensure system stability.

Developed and implemented GitHub Actions CI/CD pipelines, automating build, test, and deployment workflows to significantly reduce manual intervention in application delivery by an estimated 30%.

Managed domain routing via Route 53, configured SSL/TLS certificates, set up load balancers, and deployed Nginx as a reverse proxy for backend APIs and web dashboards.

Maintained comprehensive deployment runbooks, production checklists, and infrastructure documentation, enhancing team-wide visibility and operational readiness.

Leveraged Jira for task coordination and Slack for real-time deployment updates, fostering cross-functional team collaboration and efficient communication.

Supported strategic infrastructure planning and cloud resource organization, optimizing deployment strategy for scalable and secure application delivery.

Deployed a full-stack streaming application across three dedicated AWS EC2 Ubuntu instances, replicating a real-world 3-tier production architecture (MongoDB, Java Spring Boot, React).

Configured MongoDB with precise bindIp settings for remote backend connectivity, resolving an empty black-screen issue on the frontend and ensuring data integrity.

Built and deployed the Java Spring Boot backend using Apache Maven, resolving environment variable syntax errors and securing remote MongoDB connection strings.

Configured Nginx as a reverse proxy on the frontend server, accurately routing browser-origin API requests to the backend and resolving cross-origin routing failures.

Applied granular Security Group rules per tier, locking MongoDB port to backend IP, restricting API port to frontend, and exposing 80/443 publicly for network-level access control.

Implemented GitHub Actions CI/CD pipelines with DockerHub integration for automated build/deployment workflows, separating production/staging environments with documented rollback procedures.

Diagnosed and resolved a full chain of real deployment failures across all three tiers, documenting every fix as deployment runbooks for repeatable, production-grade delivery, improving future deployment success rates by 25%.