Building reliable infrastructure, automated delivery pipelines and secure IT environments through Linux, cloud technologies, DevOps and cybersecurity.
Sasidu Rashmika
Infrastructure & Security
01 / About
I am a Bachelor of Information Technology (Hons) graduate from Saegis Campus with practical experience in system engineering, Linux administration, infrastructure monitoring, DevOps and cybersecurity.
During my internship at CloudVito Pvt Ltd, I worked across development, staging and production environments. My responsibilities included supporting Linux servers, maintaining DSpace repositories, monitoring infrastructure and working with Docker and Proxmox VE.
I am particularly interested in building reliable, observable and secure infrastructure while continuously improving deployment workflows through automation and modern DevOps practices.
Current Focus
Linux administration · Cloud infrastructure · CI/CD automation · Kubernetes · Monitoring · Cybersecurity
2025
System Engineering
Industry experience
2026
B.I.T. (Hons)
Information Technology
DevOps
Automation
CI/CD & containers
Security
Cybersecurity
Infrastructure focused
02 / Experience
Intern System Engineer
Key Responsibilities
Managed development, staging and production environments, maintaining service availability and consistency.
Deployed and maintained DSpace repositories with user, group and access-control management.
Monitored, analyzed and troubleshooted servers using Graylog, Kibana and PRTG.
Supported Linux server administration and application services.
Worked with Proxmox VE and Docker for virtualization and containerized environments.
Investigated infrastructure and application issues and supported reliable service operations.
Infrastructure Stack
Core Focus
Infrastructure operations, Linux administration, monitoring, application services and environment management.
Environment Management
Supported development environments and application services.
Maintained staging environments for testing and validation.
Supported production infrastructure and service availability.
This experience provided practical exposure to real-world infrastructure operations, production environments, Linux administration, monitoring and application service management.
03 / Technical Arsenal
My technical skill set combines system administration, DevOps automation, cloud infrastructure, networking, monitoring and cybersecurity. I focus on practical infrastructure solutions that are reliable, observable and maintainable.
Server administration, troubleshooting and infrastructure operations
Automation, containerization and deployment workflows
Cloud platforms and virtual infrastructure management
Infrastructure monitoring, logging and operational visibility
Core networking concepts and infrastructure connectivity
Security fundamentals, threat awareness and defensive practices
Scripting and programming for automation and application development
Database technologies and application platforms
Technology Matrix
Workflow
04 / Selected Work
DEVOPS / CLOUD
Kubernetes Deployment Automation
Designed an automated CI/CD workflow for building, testing, scanning, packaging and deploying containerized applications to Kubernetes.
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LINUX / SYSTEM ADMINISTRATION
Bash-based Infrastructure Monitoring
Developed Bash scripts to monitor CPU usage, memory consumption, disk space and system uptime, with automated CSV and text reporting.
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CYBERSECURITY / AI
Explainable Zero-Day Intrusion Detection
An Autoencoder-based network anomaly detection research project combining reconstruction-error analysis with Explainable AI to identify and interpret suspicious network traffic.
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SOFTWARE DEVELOPMENT
Business Management Application
Developed a management solution covering order processing, billing, inventory and staff-related operations.
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WEB / FULL STACK
Modern Web Development
Worked on web-based applications involving frontend interfaces, backend services, databases and user-facing workflows.
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INFRASTRUCTURE
Linux, Virtualization & Monitoring
Hands-on infrastructure work involving Linux servers, virtualization, container environments, networking and monitoring platforms.
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More projects are available on GitHub.
Explore repositories, experiments and ongoing technical work.
05 / Research
Cybersecurity · Machine Learning
This research explores an anomaly-based intrusion detection approach using an Autoencoder model to learn patterns of normal network traffic and identify potentially abnormal behaviour through reconstruction error analysis.
Explainability is incorporated using SHAP to provide insight into the features contributing to detected anomalies. The approach is designed as a foundation for a practical security monitoring workflow rather than relying only on predefined attack signatures.
Dataset
NSL-KDD
Model
TensorFlow / Keras Autoencoder
Explainability
SHAP
Research Area
Network Anomaly Detection
0.91
AUC-ROC
0.88
Precision
0.86
Recall
0.86
F1 Score
Detection Pipeline
Network traffic is captured and transformed into flow-level data.
Traffic features are cleaned, prepared and normalized.
The model learns the representation of normal network behaviour.
Reconstruction error is calculated for incoming traffic.
SHAP is used to help interpret important contributing features.
Suspicious traffic can be highlighted for security analysis.
Proposed Architecture
The research demonstrates an anomaly-based detection approach and should not be interpreted as guaranteeing detection of every zero-day attack. Threshold selection, feature quality and real-world traffic conditions can affect detection performance.
06 / Certifications
Alongside my academic studies and professional experience, I continuously develop my skills through industry-oriented certifications and technical training across cloud, cybersecurity, networking, Linux, DevOps and system administration.
AWS Skill Builder
Cisco Networking Academy
Cisco Networking Academy
Cisco Networking Academy
Cisco Networking Academy
Extraordinary Thinkers (PVT) LTD
University of Moratuwa
ISC2
Professional Training
Coursera
Udemy
SQL / SQL Server / SSMS
Professional Training
Cybersecurity Training
Linode
DevOps Training
Cybersecurity Training
Professional Training
Current Learning Direction
07 / Education
Bachelor's Degree
Completed a comprehensive Information Technology degree with practical exposure to software development, networking, system administration, cybersecurity, databases and modern computing technologies.
My academic journey has provided a strong foundation in computing while practical projects, research and professional experience have allowed me to apply those concepts to real-world infrastructure and security challenges.
08 / Leadership & Activities
Alongside technical development, I have actively participated in student leadership, event coordination, research presentations and collaborative technology activities.
Vice Treasurer
Supported ICT Club activities, event coordination, student engagement and organizational responsibilities while developing leadership and teamwork skills.
Industry Preparation Workshop
Participated in organizing and coordinating an industry preparation workshop focused on helping students develop professional and career-ready skills.
Game Tournament Coordinator
Coordinated and managed a campus gaming tournament, supporting planning, participant coordination and event execution.
PVP Pulse Gaming Tournament
Contributed to the organization and coordination of gaming activities and student engagement initiatives.
Cybersecurity Research
Conducted individual cybersecurity research covering topics including Rootkits, DDoS attacks and the Dark Web, and presented the work at the undergraduate research symposium.
Competitive Programming & Innovation
Saegis Campus
Saegis Campus
Professional Approach
I enjoy working in collaborative environments where technical problem-solving, communication and continuous learning come together to deliver practical results.
09 / Contact
I'm open to opportunities in system administration, DevOps, infrastructure, cloud and cybersecurity. If you have a project, opportunity or technical discussion in mind, feel free to get in touch.
Available for technical roles, internships, freelance projects and collaborative opportunities.
© 2026 Sasidu Rashmika
Systems · DevOps · Cybersecurity