CPU Busyi
2.6% AVAILABLE FOR PLATFORM & RELIABILITY WORK · COLOMBO, LK · AVAILABLE FOR FREELANCE PROJECTS
Systems made reliable
I design, automate, and operate cloud platforms from resilient OpenShift environments to calmer, more observable delivery workflows.
ALL SERVICES NORMALUTC+05:30
OBSERVABILITY
Signals before
surprises.
PressureNormal
APIHealthy
App4 / 4
DatabaseReady
BackupsVerified
Sys Loadi
0.42RAM Usedi
48.1%SWAP Usedi
4.0%Root FS Usedi
61.0%CPU Coresi
4Uptimei
18d 06hCPU Basic%
12:0014:0016:0018:00now
Memory BasicGiB
12:0014:0016:0018:00now
Network Traffic Basickb/s
12:0014:0016:0018:00now
Disk Space Used Basic%
12:0014:0016:0018:00now
SERVICES
DevOps support for reliable application delivery
Available for selected freelance and contract DevOps projects.
I help small teams and growing products automate deployments, operate cloud infrastructure, improve observability, and resolve production issues.
Cloud and Server Infrastructure
Build secure, maintainable infrastructure for hosting and operating applications.
- Linux server provisioning and hardening
- AWS, GCP, or cloud VM setup
- Network, firewall, DNS, and domain configuration
CI/CD and Deployment Automation
Replace manual releases with repeatable, traceable, and safer deployment workflows.
- GitHub Actions workflows and GitLab CI/CD pipelines
- Build, test, deployment, and Docker registry workflows
- SSH-based deployment automation where appropriate
Kubernetes and OpenShift Support
Deploy and operate containerised workloads on Kubernetes and OpenShift platforms.
- Deployment, StatefulSet, Service, Route, and Ingress configuration
- ConfigMaps, Secrets, resource limits, and health probes
- Persistent storage and network policy configuration
Monitoring and Reliability
Improve operational visibility and detect infrastructure or application problems earlier.
- Prometheus configuration and Grafana dashboards
- Infrastructure, application, availability, and database metrics
- Alert rules and backup monitoring
SELECTED DEPLOYMENTS
Work that holds up
when it matters.
01 PRODUCTION
OpenShift Platform Engineering
Built resilient cluster environments, backup paths, storage, and operational guardrails for global client workloads.
02 LAB
Homelab / gajan.dev
A personal learning platform for running Kubernetes workloads, observability, and cloud delivery experiments.
03 LIVE
Zelvo
Receipt-aware expense tracking application deployed with a practical cloud delivery stack.
04 CLIENT
NuBred
Agriculture and plant variety management system delivered with a modern web and cloud stack.
05 BUILD
NoteMate
AI-powered note taking platform combining voice processing, cloud services, CI/CD, and observability.
TECHNICAL WRITING
Latest Articles
Building a Zero-Knowledge One-Time Secret Sharing Tool
How gajan.dev/clipboard encrypts secrets in the browser, stores only ciphertext on Contabo K3s with memory-only Valkey, and burns the record on first read, with the design choices behind each decision.
Read article →
Route 53 and TLS Certificates
A practical guide to AWS Route 53 and TLS certificates covering hosted zones, record types, alias records, routing policies, health checks, ACM issuance and validation, certificate chains, SNI, and HTTPS troubleshooting.
Read article →
Building a Three-Node HA K3s Homelab
A practical RHEL 10.2 and VirtualBox homelab build with three K3s server nodes, embedded etcd, Prometheus, Grafana, and secure Cloudflare Tunnel access.
Read article →PRODUCTION TROUBLESHOOTING
Prepared beats
heroic.
System documentation
Maintained clear system documentation to support collaboration across teams.
Production upgrades
Implemented major production version upgrades with thorough testing, procedure documentation, and impact analysis.
Secure network access
Managed network policies across telco products and OpenShift environments to ensure secure access.
EXPERIENCE
Four years of
systems thinking.
OPERATING STACK
BashLinuxRHELMongoDBPythonMySQLOpenShift VirtualizationVMwareKubernetesDockerCI/CD PipelinesAWSGCPRookCephAnsiblePrometheusGrafanaCloudflareHelmVeleroMinIOGitOpsWeb App SecurityOSINTNode.jsExpressMongoose
CERTIFICATIONS
- Advent of Cyber 2025TryHackMe · 2025
- Red Hat System Administration I (RH124), Version 10.0Red Hat · 2025
- Red Hat Certified OpenShift AdministratorRed Hat · 2025
- Back End Development and APIsfreeCodeCamp · 2024
- Containers & Kubernetes EssentialsIBM · 2024
- Advent of Cyber 2023TryHackMe · 2023
- SQL (Intermediate)HackerRank · 2023
- Python (Basic)HackerRank · 2023
- AWS Educate Introduction to Cloud 101AWS · 2023
- The Complete Web DeveloperZero to Mastery Academy · 2021
- JavaScript Algorithms and Data StructuresfreeCodeCamp · 2020
- Responsive Web DesignfreeCodeCamp · 2020
- Diploma in Web DevelopmentESOFT Metro Campus · 2019
- Diploma in Information TechnologyESOFT Metro Campus · 2018
TECHNICAL WRITING
Make operations
repeatable.
FIELD NOTE / 001
Operational docs that shorten the path from alert to action.
Procedure writing, knowledge transfer, deployment notes, and impact analysis are part of the system, not an afterthought.
Request a writing sample →