Jezreel Nyange
Nairobi
Summary
With over 10 years of experience, I specialize in cloud automation and infrastructure optimization. My expertise includes implementing GitOps practices with ArgoCD and leveraging observability tools like Prometheus, Mimir, and OpenTelemetry to enhance system reliability and performance. Passionate about open-source solutions and Linux/Unix systems, I am committed to streamlining cloud infrastructure processes to deliver scalable, cost-effective, and high-quality solutions.
Overview
10
10
years of professional experience
1
1
Certification
Work History
Site Reliability Engineer
commercetools
Munich
03.2023 - Current
- Maintained system reliability through proactive monitoring and incident management.
- Implemented automation with ArgoCD, Ansible, GitHub Actions, and Terraform tools to streamline deployment processes and reduce downtime.
- Collaborated with development teams to enhance application performance and availability.
- Diagnosed and resolved complex technical issues across multiple platforms in GCP and AWS.
- Conducted root cause analyses to prevent future incidents and improve processes.
- Set up monitoring and observability in Prometheus and Grafana for our infrastructure monitoring, which was set up in GCP compute instances. This was a migration from the ELK stack.
- Migrated Prometheus to distributed Mimir in GKE for scalability.
- Set up the OpenTelemetry tracing solution with the OpenTelemetry collector and Grafana Tempo backend running on GKE.
- Being on-call rotation to be on standby to attend to any occurring incidences.
Systems Administrator - Cloud Infrastructure and Cyber Security
KENYA EDUCATION NETWORK
06.2019 - 12.2022
- Member of the Computer Emergency Response Team (CERT) at the Kenya Education Network.
- Member of Data Protection Committee.
- Installation and setup of Linux Server OS; RPM based, Debian based and FreeBSD.
- Advanced Unix and Linux server management and optimization.
- Network monitoring and configuration management with collectd, munin, nagios, and cacti.
- Application Virtualization & cloud services Orchestration using VMware, KVM, Ganeti, Synnefo and AWS.
- Security logging and data visualization and analysis to identify malicious network and system activities.
- Operational Knowledge of DDOS mitigation, DNS attacks, Malware exploits, Web security, Zone based firewalls.(Pfsense & csf)
- Web Application firewall implementation and configuration (ModSecurity)
- Web applications and systems penetration testing.
- Vulnerability Scanning, report preparation and threat & attacks mitigation with open source tools like Nikto, NMAP, Joomscan, and WPscan.
- Content creation for cyber security and network monitoring trainings.
- Training on secure use of the internet / being safe online.
- Host-based firewall setup on linux servers; iptables and configserver firewall (SCF).
- Email server setup and installation: Zimbra, Postfix and Exim MTA installation and setup, configuration and management.
- Email filters testing, setup, configuration, administration, and patching.mailwatch)
- Automation with Ansible.
- Virtualization with openstack: Good understanding of openstack components and installation both manually and DevStack scripts.
- Data center physical setup, switching, management and operations.
- Network Auditing, designing and implementation of LAN.
Assistant Systems Administrator - Cloud Infrastructure and Cyber Security
University of Nairobi
Nairobi
06.2016 - 05.2019
- Installation and setup of Linux Server OS; RPM based, Debian based and FreeBSD.
- Security logging and data visualization to identify malicious network and system activities.
- Proficient in different CMSes; Wordpress, Joomla and Drupal.
- Proficient in webservers setup and optimization; Apache, Tomcat, Nginx.
- Database setup and management with MariaDB and MySQL.
- Application Virtualization & cloud services Orchestration using VMware, KVM and Ganeti.
- Member of Computer Emergency Response Team (CERT)
- Good knowledge working with opensource OpenVas vulnerability Assessment Scanner.
- Good knowledge working with Acunetix - Vulnerability Scanning, report preparation and threat & attacks mitigation.
- Vulnerability scanning of CMS based web application and CMS using open source tools like Nikto, NMAP, Joomscan, and WPscan.
- Intermediate knowledge working with virtualization technologies such as VMware, Ganeti, Syneffo and AWS.
- Penetration testing of common used applications and systems in the organization.
- BASH scripting and scheduling (with cronjobs) of common tasks to increase the systems performances.
- Analysing webserver and WAF (ModSecurity) logs for any information for preventive maintenance.
- Systems administration - Zimbra email servers, network monitoring systems; cacti, nagios, opennms, ticketing systems rticketing and osticket.
- Network Auditing, designing and implementation of LAN for our clients plus setup of Network monitoring systems.
- Host-based firewall setup on linux servers; iptables and configserver firewall (CSF).
Graduate Trainee - Systems and Network Administration
University of Nairobi
Nairobi
05.2015 - 05.2016
- Training in Opensource Systems and applications and network administration
- Monitoring of Systems and network with opensource tools
- Configuration of Cisco Routers
- Configuration of HP switches
- Configuration of Cisco Switches
- Configuration and administration of Linux systems
- Attending to clients calls on network downtime on NOC
- Report writing on network availability
- Designing and implementation of LAN for member institutions
Education
Bachelor of Science (B.Sc.) - Applied Computer Science
Daystar University
Skills
- Cloud automation
- Infrastructure optimization
- GitOps
- ArgoCD
- Observability tools
- Prometheus
- Mimir
- OpenTelemetry
- Otel Collectors
- Tempo
Certification
- Linux Privilege Escalation for OSCP & Beyond! - Udemy
- Certified Linux Administrator (LPIC-1) System Administrator Certification -Udemy
- Microsoft Certified Azure Fundamentals - Microsoft
- AWS Certified Solutions Architect - Associate - AWS
- Certified Ethical Hacker (CEH) - EC-Council
Timeline
Site Reliability Engineer
commercetools
03.2023 - Current
Systems Administrator - Cloud Infrastructure and Cyber Security
KENYA EDUCATION NETWORK
06.2019 - 12.2022
Assistant Systems Administrator - Cloud Infrastructure and Cyber Security
University of Nairobi
06.2016 - 05.2019
Graduate Trainee - Systems and Network Administration
University of Nairobi
05.2015 - 05.2016
Bachelor of Science (B.Sc.) - Applied Computer Science
Daystar University
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