Denis Smirnov

Built and maintained infrastructure for PublicNode — a public RPC (Remote Procedure Call) provider serving 50+ blockchain networks (Ethereum, Arbitrum, Solana, Cosmos, Polkadot and more). Designed automated bare-metal provisioning system using MAAS (Metal-as-a-Service) with LUKS encryption, RAID1 and LVM. Operated 7 Kubernetes clusters across 4 regions (Frankfurt, New York, Tokyo, Amsterdam) with GitOps via ArgoCD and full Infrastructure as Code (IaC). Built RPC endpoint monitoring for 200+ endpoints using Prometheus and Uptime Kuma, on-call rotation and incident response following SRE best practices. Implemented High Availability (HA) secrets management with HashiCorp Vault.

Built and operated multi-region, high-availability (HA) infrastructure for a multi-tenant SaaS mining pool platform. Managed 12+ Kubernetes (K8s) clusters across 4 regions (Yandex Cloud, Selectel, Nebius, DigitalOcean) with full disaster recovery (DR) coverage. Implemented complete GitOps workflow with ArgoCD and GitHub Actions, CI/CD pipelines for multiple microservices, blue-green and canary deployment strategies. Designed Stratum v2 relay infrastructure handling 10K+ concurrent miner connections. Built observability stack: Prometheus, Grafana, Loki across all regions; on-call rotation and incident management following SRE practices. Managed all infrastructure as code (IaC) with Terraform and Helm.

Led DevOps / Site Reliability Engineering (SRE) team for one of the leading non-custodial cryptocurrency wallets with 5M+ users. Managed multi-region high-availability (HA) infrastructure for RPC nodes and Blockbook indexers across 100+ blockchain networks on LXD-based hypervisors (Hetzner, OVH). Maintained validator nodes for Cosmos-based networks with Tenderduty monitoring; established on-call rotation, incident management and SLO/SLA tracking. Built automated CI/CD update pipeline for 30+ blockchain daemons (Infrastructure as Code via Ansible). Operated full observability stack: Prometheus, Victoria Metrics, Grafana, Loki, Alertmanager.

Led DevOps department supporting Kubernetes (K8s) clusters for enterprise clients including IKEA, VW Group, and Lada. Implemented service mesh (Istio) and HashiCorp Vault for secrets management. Solo-led zero-downtime migration of IKEA Russia from Selectel to Yandex Cloud, moving all production workloads to managed services within 2 months with full Infrastructure as Code (IaC).

Managed DevOps team of 3 engineers. Led full infrastructure migration from on-premise M9 datacenter — legacy OpenShift cluster running Magento-based PHP platform — to Yandex Cloud. Replaced the existing setup with a proper Kubernetes infrastructure. Established on-call rotation, incident monitoring, update processes, and migrated key services to managed cloud solutions.

Supported blockchain releases and maintained the full ecosystem around Minter Network — explorers, indexers, bots, landing pages and auxiliary services. Built HA Kubernetes cluster on Hetzner with DR on DigitalOcean. Implemented Global Load Balancer for fault tolerance. Set up complete CI/CD pipeline with GitHub Actions and Helm.

Led team of 5 engineers. Complete infrastructure migration from Windows/KVM to Linux/Docker Swarm. Implemented GitLab CI, centralized logging with ELK, built CDN on PowerDNS-geo.

10+ years across multiple sysadmin roles. Led sysadmin team at a hosting provider, responsible for all infrastructure operations and managing 5000+ servers. At ForexPF — administered high-traffic platform with 1M+ users. Across roles: worked with RIPE NCC for IP allocation, built private clouds on CloudStack.