Serhii

Serhii Kaliuzhnyi
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | LinkedIn | GitHub | Telegram

PROFESSIONAL SUMMARY

DevOps Engineer with 3+ years building cloud infrastructure and 3 years in software development. Built multi-region AWS EKS serving 50k+ users, set up GCP from
scratch, migrated DigitalOcean to AWS, and cut cloud costs by 30%.

TECHNICAL SKILLS

Cloud: AWS · GCP · DigitalOcean
IaC & Config: Terraform · Ansible · Helm · Kustomize
Containers & Orchestration: Kubernetes · Docker · EKS · GKE
CI/CD & GitOps: ArgoCD · GitHub Actions · GitLab CI · Jenkins · Octopus Deploy · Bitbucket Pipelines
Networking & Ingress: Kong · Nginx · Traefik · Istio
Monitoring & Observability: Prometheus · Grafana · Loki · ELK · Elasticsearch · Jaeger · Coroot
Security & Secrets: cert-manager · external-secrets · Keycloak · Vault · Dex
Languages & Databases: Python · Go · Rust · Node.js · Bash · PostgreSQL · MongoDB · Redis
OS & Tools: Linux · external-dns · Reloader

PROFESSIONAL EXPERIENCE

Platform Engineer 10.2024 – Present
NDA
Architected multi-region AWS EKS infrastructure serving 50k+ users across 3 regions with 99.9% uptime
Implemented ArgoCD-based GitOps workflows reducing deployment time from hours to minutes
Designed and maintained Terraform modules for reproducible infrastructure across environments
Built comprehensive observability stack with Prometheus, Grafana, Loki, and Jaeger

DevOps Engineer 10.2024 – 05.2025
IT Craft
Delivered infrastructure for 3 concurrent projects using Terraform and Kubernetes
Migrated production workloads from DigitalOcean to AWS with zero downtime
Built GCP infrastructure from scratch: GKE clusters, Cloud SQL, networking, and IAM
Configured Kong API Gateway for microservices routing, rate limiting, and authentication
Established CI/CD pipelines with GitHub Actions and GitLab CI for automated deployments

DevOps Engineer 08.2023 – 10.2024
Sigma Software
Owned and scaled AWS infrastructure (EKS, RDS, S3, CloudFront) for 5+ projects
Achieved 30% cloud cost reduction through right-sizing, reserved instances, and spot fleet strategies
Implemented monitoring and alerting with Prometheus, Grafana, and PagerDuty

Software Developer 08.2020 – 08.2023
Sigma Software
Developed full-stack applications using Node.js, React, and Angular
Designed RESTful APIs and microservices with PostgreSQL, MongoDB, and Redis

EDUCATION

Master of System Engineering — Kharkiv National University of Radio Electronics (KNURE) (2014 – 2020)

CERTIFICATIONS

AWS Certified Cloud Practitioner
CKA — Certified Kubernetes Administrator (in progress)

LANGUAGES

English: B2 (Upper-Intermediate) | Ukrainian: C2 (Native)