schlafzucker

Infrastructure migration: designed and migrated the company’s infrastructure from a single server to a 4-node Docker Swarm cluster. Configured the service networking scheme, Traefik-based ingress, environment separation, and deployment process management through Portainer / Portainer Agent. Kubernetes migration: migrated the infrastructure from Docker Swarm to a managed Kubernetes cluster: described deployments using Helm charts, configured the Traefik ingress controller, kept GitHub Actions for CI, and introduced ArgoCD for CD. CI/CD automation: built the containerization and service delivery process: wrote Dockerfiles and docker-compose configurations, configured GitHub Actions for building images, delivering them to servers, and deploying to dev/test/prod environments. Stateful services: administered PostgreSQL, ClickHouse, and Redis. PostgreSQL was used for core services, ClickHouse for the parser and analytical data, and Redis for caching. Optimized one critical SQL query, reducing execution time by approximately 70%. Observability: configured a basic observability infrastructure: metrics collection with Prometheus, visualization in Grafana, log analysis, and issue diagnostics at the service, container, network, and host resource levels. Production support: supported services after releases: investigated incidents, checked network availability, container state, application errors, integration issues, and degradation of infrastructure components. Backend / integrations: developed backend components of product services and integrations: 2GIS API, YooKassa, authorization, ticket generation, email notifications, and S3-compatible storage. Participated in migrating S3 storage between providers without disrupting user scenarios.