Senior DevOps Engineer

CoreStar is a dynamic technology company supporting partners in heavy-load industries with high-performance solutions. Our expert teams bring a startup-driven mindset, focusing on innovation, collaboration, and efficiency in every project. At CoreStar, you’ll have the opportunity to grow your skills, tackle exciting challenges, and directly contribute to impactful products.

📌 Key Responsibilities: 

• Design and evolve infrastructure as code (Terraform/Ansible/Kubernetes/Flux) to deliver repeatable, scalable environments.

• Build and maintain reliable CI/CD pipelines (GitLab CI/Flux) with safe deployments and rollbacks.

• Operate and harden Kubernetes/container platforms (upgrades, HA, NetworkPolicies, secrets, observability).

• Implement monitoring, logging, and tracing (Prometheus/Grafana, Coralogix), define SLO/SLI, and drive incident response.

• Enforce security and compliance: IAM and least-privilege access, secret management, OS/hardening, audits.

• Optimize performance and cost: troubleshoot network/storage/CPU bottlenecks, capacity planning, DR/backup strategy, FinOps.

• Partner with engineering teams: review infra changes, champion best practices, and automate repetitive workflows.
  

📌 Requirements:

• 5+ years of experience as a DevOps Engineer.

• Strong Linux administration (systemd, shell, filesystems, performance, security).

• Deep networking knowledge: TCP/IP, DNS, HTTP(S), TLS, VPNs, load balancing, proxies/ingress.

• Cloud platforms (AWS, GCP, or Azure): VPC/networking, IAM, compute, storage.

• On-call readiness

• Containerization & orchestration: Docker, Kubernetes (deployment, scaling, Flux/Helm/Kustomize).

• Infrastructure as Code: Terraform (preferred); config management with Ansible/Puppet.

• CI/CD: design and maintain pipelines (GitLabCI, ArgoCD etc.).

• Observability & incident response: Prometheus/Grafana, ELK/EFK, tracing; on-call/IR practices.

• Scripting: Bash plus one of Python or Go for automation.

• SRE practices: reliability, SLO/SLI, capacity planning, disaster recovery/backups, cost/perf optimization.

• Git-based workflows and release management; strong problem-solving and team mindset.

📌 Nice to have:

• Hands-on AWS (VPC/IAM, EKS, ALB/NLB, WAF, Route 53, S3) in production.

• Service mesh expertise (Istio) and advanced K8s networking (CNI, NetworkPolicies, ingress/egress hardening).

• Expertise in networking troubleshooting & performance tuning (eBPF; L3–L7 bottlenecks).

• Kafka administration (cluster sizing, partitions/replication, ACLs, monitoring, tuning).

• ClickHouse operations (replication/sharding, HA, backup/restore, query/performance tuning).

• MongoDB operations (replica sets, sharding, backup/restore, indexing & perf tuning).

• MySQL operations (HA/replication, backups, schema/query optimization).

• Kubernetes from scratch & bare-metal ops (bootstrapping, etcd care, CNI/CSI, HA control plane, upgrades).

📌 Benefits:

🏝 24 working days of paid annual leave 
🤝 6 days of paid sick leave  
🖊 Official employment
📄 Medical insurance
☕️ Coffee zone with fruit & snacks available in the office 
🥗 Corporate Lunch provided by the company
💪 Gym and sports classes 
🙌 Healthy and friendly work atmosphere