Marcus Chukwuoma

General Roles and Projects:

• • DevOps, NodeJS, and Bash scripting mentorship.
• • Mentored on provisioning a highly available kubernetes cluster on EKS, using terraform.
• • Mentorship on setting up monitoring systems comprising Prometheus, Grafana, and Loki.

- Re-wrote a Bash Script legacy codebase (1000+ lines of code used for 5 command line modules) to JavaScript, and created a NodeJS command line tool that serves the same purpose as the bash script. This helped to improve the maintainability of the codebase.

- Re-factor a multi-environment terraform project from using a dedicated directory per environment to using terraform workspaces to separate environments. This greatly increased maintainability, and eradicated code repetitions.

- Create Gitlab runner and setup reusable Gitlab pipeline used for microservice CICD.

- Setup a highly scalable ECS cluster for microservice applications using terraform.

- Mentor DevOps Engineers using an efficient learning roadmap and feedback system.

- Use terraform infrastructure as code to provision AWS services such as ECS Fargate, AWS cloudMap, SNS, SQS, ECR, S3, etc for microservice applications.

- Setup a strategic combination of fargate and fargate-spot instances to scale the services effectively and minimise costs.

- Write JavaScript functions to retrieve adequate report from Cypress and Postman test automations, and send reports to Microsoft Teams channel.

- Write Bash scripts to manage task definitions outside of terraform codebase, to prevent a mismatch between application versions that are deployed from the application’s CICD pipeline and that of Terraform.

- Perform DevSecOps tasks with sonarqube through static code analysis of Java and NodeJS applications.

- Create database groups and designate user access level.

- Create terraform modules and setup a highly scalable infrastructure for microservices applications.

- Setup AWX ansible to effectively manage the execution of ansible playbooks on GitLab repository.

- Create ansible playbooks for configuration and change management on multiple servers.

- Write Python and JavaScript lambda functions to clean up redundant AWS resources.

- Setup cloudwatch alarms to monitor infrastructure metrics and user activities, such as logins without MFA.

- Setup AWS Guardduty organisation using terraform, for intrusion and threat detection to monitor all accounts in the AWS organisation.

- Write Python lambda function that converts EBS volumes from GP2 to GP3, for efficiency and cost optimization purpose.

- Write Python lambda function that converts unencrypted EBS volumes to encrypted EBS volumes.

- Refactor Ansible provisioning script so that new EBS volumes are always encrypted.

- Write Python lambda function that turns off public access on hundreds of S3 buckets in the AWS accounts of the organisation.

- Create Ansible playbooks for deleting all resources owned by a client after contract is terminated.

General Roles and Responsibilities:

• • Develop full-stack NodeJS applications and implement Quality Assurance with unit testing, integration testing, and end-to-end testing.
• • Implement Pipeline as Code using Jenkins, TravisCI, and CircleCI.
• • Write terraform scripts and deploy highly scalable Kubernetes cluster to GCP and AWS.
• • Implement Configuration and Change Management using Packer and Ansible.
• • Integrate Prometheus, Grafana, and Loki to a running Kubernetes cluster for effective cluster monitoring.
• • Setup Jenkins CI-CD infrastructure on a Kubernetes cluster, and transitioned 3 microservices CI-CD pipelines from CircleCI to Jenkins declarative pipelines. This initiative helped Andela to save over 60% of the cost incurred on CircleCI.

Technologies:

NodeJS, Bash, JavaScript, AWS, GCP, Jenkins, Prometheus, Grafana, Loki, Github, Gitlab, Terraform, Ansible, SQL, PostgreSQL, Redis, Rest API, Vagrant, Docker, TeamCity, MongoDB, Kubernetes.