jazzhr
Senior Kubernetes and Open Source Platform Engineer
Zappsec Inc.
IND
Full-time
Senior Level
Onsite
Discovered Yesterday
Free
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- Take escalations on Kubernetes, RKE2, Harbor, GitLab Runner, MetalLB, and OpenSearch.
- Diagnose problems from logs, metrics, manifests, and screen shares rather than direct console access.
- Work alongside client engineers while they apply the fix, and explain why it works.
- Reproduce complex failures in a lab environment when the client environment cannot be disturbed.
- Decide when an issue belongs upstream, then prepare the bug report or vendor case with the evidence attached.
- Track recurring escalations and name the underlying platform weakness that produces them.
- Diagnose control plane issues covering etcd health, API server latency, scheduler behaviour, and certificate expiry.
- Advise on cluster topology, node pool design, and failure domain placement.
- Review RBAC, admission control, Pod Security Admission, and network policy design.
- Troubleshoot CNI and CSI behaviour, including pod networking, MTU problems, and volume attachment failures.
- Guide etcd backup strategy and test restore procedures against a real recovery target.
- Advise on CIS hardening profiles and air gapped installation patterns where the client requires them.
- Harbor. Review project structure, robot accounts, replication rules, scanning policy, garbage collection, and storage growth.
- GitLab Runner. Advise on the Kubernetes executor, concurrency limits, caching, resource requests, and build isolation choices.
- MetalLB. Review layer 2 and BGP mode selection, address pool design, and peering with upstream routers.
- OpenSearch. Advise on shard and index strategy, index lifecycle policy, snapshot repositories, node roles, and cluster sizing.
- Flag where a component has been pushed past its design intent, and say what should replace it.
- Produce upgrade plans covering version skew, sequencing, prerequisites, and rollback.
- Detect deprecated and removed API usage before an upgrade rather than during it.
- Review Helm chart and CRD upgrade paths, including the ones that cannot be rolled back.
- Run periodic platform health reviews covering capacity, resource limits, backup validity, certificate lifetimes, and security posture.
- Write each review as a prioritized finding list with a remediation step per finding.
- Give the client an honest severity call, including the findings they will not want to hear.
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