About the Role:

We are looking for a Senior DevOps Engineer for the OpenVault project, hosted on an on-premise Kubernetes environment backed by PostgreSQL and Apache Cassandra. The engineer will own the setup, stability, and day-to-day operations of the platform, act as the first line of deep troubleshooting for Kubernetes and Linux networking issues, and work directly with customers to understand their requirements and size the infrastructure correctly.

Key Responsibilities:

- Install, configure, upgrade and maintain on-prem Kubernetes clusters hosting the OpenVault platform.

- Troubleshoot and resolve Kubernetes issues across workloads, networking (CNI, Ingress, DNS), storage and node health.

- Diagnose and fix Linux and network-level problems including routing, firewall, DNS, load balancer and connectivity issues.

- Deploy, operate and tune PostgreSQL and Cassandra clusters, including backups, restores, replication, scaling and HA.

- Engage with customers to gather technical requirements and translate them into infrastructure sizing (compute, memory, storage, network).

- Prepare sizing documents, deployment architecture and runbooks, and present recommendations to customer stakeholders.

- Automate provisioning and configuration using Ansible/Terraform, Helm and shell scripting.

- Build and maintain CI/CD pipelines for application and infrastructure deployments.

- Set up monitoring, alerting and logging, and drive incident response, root-cause analysis and preventive fixes.

- Apply security best practices: OS hardening, patching, RBAC, TLS and secrets management.

Must Have Skills:

- Kubernetes administration on on-prem / bare-metal clusters (kubeadm, RKE2/Rancher, or OpenShift).

- Strong Kubernetes troubleshooting: pod scheduling, CrashLoopBackOff, OOMKilled, resource quotas/limits.

- Kubernetes networking: CNI plugins (Calico, Cilium, Flannel), Services, Ingress controllers.

- Linux administration (RHEL/Rocky/Ubuntu): systemd, processes, kernel tuning, patching, hardening.

- Strong Linux networking: TCP/IP, DNS, routing, VLANs, iptables/nftables, firewalls.

- Load balancers and reverse proxies (HAProxy, NGINX, Keepalived).

- PostgreSQL operations: setup, backup/restore, streaming replication, HA and failover.

- Apache Cassandra operations: cluster setup, scaling nodes, repairs, compaction, nodetool.

- Storage for stateful workloads: PV/PVC, StorageClasses, CSI drivers.

- Infrastructure sizing and capacity planning for Kubernetes, PostgreSQL and Cassandra clusters.

- Excellent communication skills: working directly with customers to gather requirements, run sizing discussions, and present recommendations.

- Docker / containerd, Helm charts, private container registries (Harbor).

- Bash/Shell scripting; IaC tools like Ansible and Terraform.

- CI/CD pipelines: Jenkins, GitLab CI (self-hosted), GitHub Actions.

- Leadership capability & having experience of managing 6+ resources.

Good-to-Have Skills:

- Experience setting up and maintaining microservices in an on-prem Kubernetes cluster.

- Hands-on with Prometheus, Grafana and centralized logging (Loki / EFK).

- Exposure to GitOps (Argo CD / Flux) and service mesh (Istio / Linkerd).

- Experience with Kubernetes operators for databases (CloudNativePG, K8ssandra).

- Experience with air-gapped or restricted-network deployments.

- Kubernetes certifications such as CKA / CKAD / CKS.