Responsibilities and Duties： Linux System Administration: Install, configure, patch, and maintain RHEL/Fedora servers. Performance & Low‑Latency Tuning: Conduct network, system, and kernel tuning for ultra‑low‑latency workloads; develop benchmarks and monitoring dashboards. Scripting & Automation: Write robust Bash, Python, and Perl scripts for routine tasks, diagnostics, and custom tooling. Configuration Management: Build and maintain Ansible playbooks or Salt states (Salt preferred); enforce idempotent configurations across hundreds of nodes. Virtualisation & Cloud: Deploy and manage Proxmox clusters; create/maintain VMs and containers; integrate with AWS services where applicable. Network Engineering: Implement and troubleshoot advanced networking (VLANs, bonding, NIC teaming, SR‑IOV, TCP/UDP tuning, QoS). Cisco networking and Fortinet experience is a plus. Storage Engineering: Manage and troubleshoot SAN and NAS storage solutions and block‑level storage using iSCSI. Perform LUN masking, multipathing, and performance tuning for Linux hosts. HPE SAN experience a plus. Incident Response: Provide timely response to production incidents; some after‑hours/weekend work is required. Documentation & Knowledge Sharing: Produce clear runbooks, SOPs, and technical documentation; mentor junior engineers. Security & Compliance: Apply hardening guidelines, manage SELinux where required, and support audit requirements. What You Offer： Minimum Bachelor’s degree in Computer Science, Information Technology, or a related field. 5–10 years of professional Linux engineering experience (RHEL/Fedora). Strong problem‑solving skills, ability to work independently and as part of a team, and a proactive attitude toward automation and improvement. Strong networking fundamentals (TCP/IP, routing, switching, firewalls). System, kernel, and network performance tuning (including low‑latency). Hands‑on experience with Proxmox (preferred) or comparable platforms (KVM, VMware). Advanced Bash, Python, and Perl scripting. Proven experience with Ansible or Salt (Salt preferred). Experience with container technologies (Docker, LXC/LXD). Familiarity with monitoring stacks (Prometheus, Grafana, Zabbix, LibreNMS). Knowledge of security frameworks (CIS, NIST). Experience with Windows networking. Working knowledge of AWS services (EC2, VPC, S3) is nice to have. Prior work in high‑frequency trading and financial services is nice to have Fluency in English. Mandarin and Cantonese fluency are nice to have What We Offer： Dynamic and collaborative work environment A flat management structure where everyone’s voice is valued Work-life balance within a multicultural environment Fully stocked kitchen for breakfast and lunch Attractive benefits package with a discretionary bonus