Portfolio

Modernised a legacy monolith into containerised microservices orchestrated by Amazon EKS. Helm charts drive repeatable deployments, Argo CD enforces GitOps practices, and automated integration tests validate each change before progressive delivery reaches production.

• Implemented blue/green rollouts with Argo Rollouts to safeguard weekly releases.
• Enabled horizontal pod autoscaling that adapts to peak sporting-event traffic.
• Streamlined day-2 operations via Grafana dashboards and Kubernetes event logging.

Designed an observability stack that ingests, stores, and visualises low-latency match data for real-time decision making. Unified metrics, logs, and traces empower engineers and analysts to diagnose incidents in minutes.

• Deployed Prometheus Operator with Helmfile to manage more than 150 scrape configs.
• Integrated Loki and Tempo for correlated log and trace analysis within Grafana.
• Crafted alerting pipelines with Alertmanager and PagerDuty to reduce noise.

Codified the company's AWS foundation with reusable Terraform modules. Automated account vending, networking, and guardrails so product teams can launch environments in minutes while staying compliant.

• Provisioned core networking with Transit Gateway and cross-account Route 53 Resolver.
• Implemented policy-as-code checks (tfsec, Checkov) inside GitHub Actions workflows.
• Delivered self-service environment catalogues via Terraform Cloud and Service Catalog.

Built reusable GitOps patterns that govern dozens of services. ApplicationSets template tenant environments, GitHub Actions enforce policy checks, and Cosign signs container images before promotion.

• Introduced automated drift detection and chat-ops approvals for production changes.
• Packaged CI checks into composite actions to standardise testing and security scanning.
• Documented runbooks and architecture diagrams to accelerate onboarding.

Transformed deployment workflows from manual 2-hour processes into fully automated pipelines completing in under 8 minutes. Blue-green and canary deployments with Argo Rollouts ensure zero-downtime releases across 150+ microservices.

• Deployment frequency increased from weekly to 15+ deployments per day.
• Change failure rate dropped below 2% with metric-based automatic rollback.
• Security gates enforce SAST, DAST, and container scanning on every pipeline run.

Established a FinOps framework that reduced monthly AWS spend by 35% across 12 accounts. Combined right-sizing analysis, Reserved Instance planning, Spot Fleet strategies, and automated cleanup of unused resources.

• Right-sized 40+ EC2 instances and RDS databases saving $15K monthly.
• Deployed Karpenter on EKS achieving 65% compute cost reduction.
• Automated unused resource cleanup with Lambda and CloudWatch Events.

Built an internal developer platform that enables application teams to provision environments, databases, and monitoring in minutes rather than weeks. Golden path templates standardise new services with built-in CI/CD, observability, and security policies.

• Reduced environment setup time from 2 weeks to 30 minutes through self-service workflows.
• Standardised service templates covering 90% of new service requirements.
• DORA metrics dashboard tracks team performance across 15+ engineering squads.

This very website serves as a living portfolio piece. Built with modern HTML5, CSS3, and JavaScript, deployed via a Jenkins CI/CD pipeline to AWS S3 with CloudFront CDN distribution. Automated HTML linting, S3 sync, and cache invalidation on every push.

• Jenkins pipeline with HTML linting, tar packaging, S3 sync, and CloudFront invalidation.
• Hosts 6 subdomain applications (rsvp, bash, price, live, doviz, convert) on shared AWS infrastructure.
• SEO optimised with structured data, OG tags, sitemap, and robots.txt.

Designed automated incident response workflows that reduced mean time to resolution by 65%. Prometheus alert rules trigger PagerDuty escalations with contextual runbooks, while chat-ops integrations enable rapid triage and communication.

• Alert routing trees with severity-based grouping reduced noise by 70%.
• Automated runbooks for top 20 incident types enable self-healing where possible.
• Post-incident review process with blameless retrospectives adopted company-wide.

Designed, built, and operate 6 production web applications, each with its own CI/CD pipeline, custom subdomain, and CloudFront distribution on personal AWS infrastructure.

• rsvp.ogulcanaydogan.com — Event RSVP management platform with real-time guest responses.
• bash.ogulcanaydogan.com — Interactive Bash scripting playground for learning Linux fundamentals.
• price.ogulcanaydogan.com — Price comparison tool aggregating product pricing data.
• live.ogulcanaydogan.com — Live streaming dashboard for real-time data feeds.
• doviz.ogulcanaydogan.com — Currency exchange rates tracker with historical charts.
• convert.ogulcanaydogan.com — Multi-purpose file and unit converter.