DENNIS CHIMEZIE SUNDAY

Cloud & DevOps Engineer
Lagos, NG.

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

Independent Project: 3-Tier Banking Application
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Cloud & DevOps Engineer

Lagos, Lagos State, Nigeria

Summary

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.

Highlights

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.

Independent Project: Netflix-Clone Full-Stack Deployment
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DevOps Engineer

Lagos, Lagos State, Nigeria

Summary

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.

Highlights

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
Remote, N/A, N/A

Training Programme

AWS, Azure, Linux, Docker, CI/CD & Cybersecurity Training Programme

Federal Polytechnic Nekede Owerri
Owerri, Imo State, Nigeria

Higher National Diploma (HND)

Engineering Technology

Skills

Cloud & AWS

EC2, VPC, Security Groups, IAM, S3, RDS, CloudFront, Route 53, Load Balancer, CloudWatch, Secrets Manager.

CI/CD & Automation

GitHub Actions, CI/CD Pipeline Design, Automated Build & Deploy Workflows, Rollback Procedures.

Application Deployment

Node.js, Next.js, Java Spring Boot, React, Production & Staging Environment Separation.

Infrastructure & Security

Docker, Nginx, PM2, SSL/TLS Certificates, Firewall Configuration, SSH Access Control, Environment Variables.

Databases & Storage

MongoDB, PostgreSQL, RDS, S3 (Private Access Patterns).

Monitoring & Observability

Datadog (Agents, Dashboards, Alerts), CloudWatch, Log Management.

Tools & Collaboration

Linux/Ubuntu, Shell Scripting, Git & GitHub, Jira, Slack, Apache Maven, Technical Documentation.

Projects

Datadog Monitoring & Alerting Setup

Summary

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

Summary

Established and managed secure Ubuntu server environments, focusing on remote administration, firewall rules, and user permissions.