Darkhanbayar Erdenebat

• Architected and codified a multi-AZ AWS platform in Terraform (VPC, ALB, Auto Scaling, EC2 Launch Templates, RDS Multi-AZ, Route 53, ACM, ECR, Secrets Manager, SSM), replacing a fragile single-instance production setup with a highly available environment supporting zero-downtime releases.
• Standardized CI/CD across 5+ products on GitHub Actions and GitLab CI — build, test, OWASP-aligned scanning (SonarQube, Snyk), push to ECR, rolling deploy — reducing change failure rate by 30%.
• Established the production observability stack (Prometheus, Grafana, Node Exporter, Blackbox Exporter, CloudWatch, SNS) with alerting on ASG lifecycle events, RDS CPU, and endpoint health; authored the runbook that let the operations team own deploys and incident response independently.
• Reduced monthly AWS spend by 40% via instance right-sizing, Auto Scaling target tracking, caching to cut RDS load, and elimination of idle capacity.
• Delivered MedOrder, a healthcare SaaS platform (Go, PostgreSQL, Redis, Kubernetes) processing 40,000+ pharmaceutical orders under full regulatory compliance — owning both the application and its production infrastructure.

Built and operated solo alongside full-time engineering work.

• Ran the entire production platform single-handed — containerized services behind Nginx with TLS termination, centralized logging, health checks, and uptime monitoring. No ops team, no downtime budget.
• Integrated multiple international eSIM supplier APIs for catalog sync, ordering, QR-code delivery, and activation tracking, enabling fully automated 24/7 fulfillment with zero manual steps in the purchase path.
• Built the platform on Go, TypeScript, Node.js, PostgreSQL, Redis, and Docker, automating product, pricing, and data-plan management to remove manual catalog maintenance entirely.

Cloud provider behind Cloud.mn — Mongolia’s first public cloud platform.

• Directed platform engineering for Cloud.mn and TTC Cloud (OpenStack, KVM, Kubernetes, Docker, MariaDB, Redis, RabbitMQ), leading 20+ engineers, architects, and PMs.
• Took the company’s own cloud platform international, launching TTC Cloud on Transtelecom — Kazakhstan’s largest datacenter — coordinating datacenter operations, local payment providers, and regional compliance.
• Owned platform reliability and the production on-call rotation, sustaining 99.95% uptime.
• Automated infrastructure provisioning and deployment workflows (Ansible, CI/CD), accelerating time-to-market for new cloud services by 35%.

• Led a full AWS migration (EC2, S3, CloudFront, RDS, ELB, Auto Scaling, Route 53) of UFE’s online learning system during a COVID-19 lockdown sprint — delivered in 10 days with zero downtime for 15,000 students. Published as an official AWS case study.
• Led the infrastructure build-out of Cloud.mn with 10+ engineers (OpenStack, KVM, Ansible), building the provisioning automation that made customer onboarding self-service and cut manual provisioning time by 90%.
• Built backend services on OpenStack APIs (Compute, Networking, Identity, Storage) with Kubernetes orchestration, enabling self-service multi-tenant resource management at scale.

• Built the Cloud.mn control panel (React, TypeScript) from the platform’s earliest stage — the user-facing layer of Mongolia’s first public cloud.
• Moved into infrastructure through self-directed work on Ansible and the OpenStack APIs, transitioning into full-stack and then platform engineering within two years.