# DENNIS CHIMEZIE SUNDAY - Cloud & DevOps Engineer
Source: https://hello.cv/chimeziedennis
dennismezie3@gmail.com | +234 906 868 6941 | Lagos

## Links
- GitHub | github.com/mexcelcloud
- Email | dennismezie3@gmail.com

## About
Highly skilled Cloud & DevOps Engineer with expertise in AWS, CI/CD pipeline design, and infrastructure automation, specializing in deploying and managing scalable, secure, and resilient cloud environments. Proven ability to architect and optimize complex 3-tier applications, resolve critical deployment failures, and implement robust monitoring solutions to drive operational efficiency and ensure high availability across diverse platforms.

## Work
### Cloud & DevOps Engineer | Independent Project: 3-Tier Banking Application
Orchestrated the end-to-end cloud deployment and infrastructure management for a secure 3-tier banking application on AWS, focusing on automation and operational readiness.
- 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.
### DevOps Engineer | Independent Project: Netflix-Clone Full-Stack Deployment
Engineered and deployed a full-stack streaming application replicating a 3-tier production architecture on AWS, focusing on robust CI/CD and secure service communication.
- 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%.

## Education
### Digital Witch Support Community | AWS, Azure, Linux, Docker, CI/CD & Cybersecurity Training Programme
### Federal Polytechnic Nekede Owerri | Engineering Technology

## Skills
### Cloud & AWS
Experienced
- EC2
- VPC
- Security Groups
- IAM
- S3
- RDS
- CloudFront
- Route 53
- Load Balancer
- CloudWatch
- Secrets Manager
### CI/CD & Automation
Experienced
- GitHub Actions
- CI/CD Pipeline Design
- Automated Build & Deploy Workflows
- Rollback Procedures
### Application Deployment
Experienced
- Node.js
- Next.js
- Java Spring Boot
- React
- Production & Staging Environment Separation
### Infrastructure & Security
Experienced
- Docker
- Nginx
- PM2
- SSL/TLS Certificates
- Firewall Configuration
- SSH Access Control
- Environment Variables
### Databases & Storage
Experienced
- MongoDB
- PostgreSQL
- RDS
- S3 (Private Access Patterns)
### Monitoring & Observability
Experienced
- Datadog (Agents, Dashboards, Alerts)
- CloudWatch
- Log Management
### Tools & Collaboration
Experienced
- Linux/Ubuntu
- Shell Scripting
- Git & GitHub
- Jira
- Slack
- Apache Maven
- Technical Documentation

## Projects
### Datadog Monitoring & Alerting Setup
Designed and implemented a comprehensive monitoring and alerting system using Datadog for Linux servers, ensuring infrastructure observability and proactive issue detection.
### Linux Server Administration Lab
Established and managed secure Ubuntu server environments, focusing on remote administration, firewall rules, and user permissions.

## Source
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