Kubernetes scheduling and quota accounting · Observability · Cloud-native telecom
Member of the Kubernetes GitHub organization. Nephio Technical Steering Committee member (LF Networking). Maintainer of M5Stack Platforms in upstream Zephyr. Research assistant at National Yang Ming Chiao Tung University, Taiwan.
| CNCF DevStats | 2,000 |
| Merged upstream | 118 pull requests across 52 projects. 93 of them in 40 CNCF-hosted and Kubernetes-ecosystem repositories. |
| Kubernetes | GitHub org member (kubernetes/org#6498) |
| Governance | Nephio TSC member, LF Networking (roster) |
| Maintainer | M5Stack Platforms in upstream Zephyr, status: maintained (MAINTAINERS.yml) |
| Community | Organizer of the O-RAN in B5G/6G track at COSCUP · I give technical talks in Taiwanese (Tâi-gí) |
Every merged contribution, listed and linked: open-source portfolio
The CNCF DevStats score updates daily via GitHub Actions; other figures as of July 2026.
I focus on correctness in Kubernetes Dynamic Resource Allocation (DRA), particularly quota arithmetic, allocator state management, and device lifecycle handling. A quota-accounting audit began with an int64 overflow in Kueue (#12896). It led to a four-PR Kueue hardening series (#12897, #12909, #12945, and #12954), followed by a corresponding overflow fix in Volcano (#5621).
In Kubernetes core, I identified and fixed five defects in the structured DRA allocator. All five fixes were merged for Kubernetes v1.37 with release notes: prevented cross-driver collisions by scoping shared-counter caches to both driver and pool (#140435); made candidate rejection and backtracking reliably roll back reserved allocator state (#140431); stopped counters from being charged twice for persisted shared-device allocations (#140437); rejected unusable validRange bounds before they could cause divide-by-zero or incorrect validation (#140666); rejected unrepresentable capacity requests instead of accepting allocations that a device could not satisfy (#140442).
Related upstream fixes include a claim-unprepare device leak in Intel's QAT DRA driver (#74) and a slice-bounds panic in the CNCF Container Device Interface parser (#321). Open work: a nil-dereference fix for KubeVirt's mediated-device builders (#18431) and an unlimited-quota sentinel bug in KAI-Scheduler's parent/child quota validation (#1881). Additional work is tracked through my open pull requests.
My next focus is lowering the barrier from using cloud-native software to contributing upstream: newcomer sessions in Mandarin and Taiwanese (Tâi-gí), together with bilingual contribution walkthroughs based on real review discussions. I completed LFC102: Inclusive Open Source Community Orientation in July 2026.
Website · Publications · Honors · ORCID · LinkedIn · LFX · Credly · hctsai@linux.com
Raised in a fishing village in Dapeng Bay, Pingtung. I care about making technical communities easier to enter, especially for people who do not start with an established professional network or English-first resources.