Senior Cloud Infrastructure Engineer (AWS & Networking)

Senior Cloud Infrastructure Engineer

We're looking for a Senior Cloud Infrastructure Engineer who is strong in enterprise networking and passionate about cloud migration and AWS. This is a hands-on senior role where you'll help lead the evolution of our hybrid on-prem + AWS infrastructure, supporting critical healthcare systems in a HIPAA-regulated environment. If you enjoy owning infrastructure design, solving complex network challenges, and modernizing platforms in the cloud — this role is for you.

What You'll Work On:

Cloud & AWS (Core Focus)

• Design, deploy, and operate AWS infrastructure with an emphasis on networking, security, and reliability
• Lead and support application and infrastructure migrations from on-prem to AWS (lift-and-shift, re-platforming, hybrid)
• Architect and manage AWS networking: VPCs, subnets, routing Security Groups, NACLs Site-to-site VPN, client VPN, Direct Connect (as applicable)
• Ensure AWS environments meet HIPAA, security, availability, and DR requirements
• Partner with application and platform teams on cloud modernization
• Support Infrastructure as Code (Terraform / CloudFormation experience preferred)

Enterprise Networking

• Design, implement, and support enterprise network infrastructure: Layer 2 / Layer 3 switching and routing
• Firewalls, VPNs, wireless, WAN
• Own network security posture using industry best practices
• Troubleshoot complex connectivity and performance issues across on-prem and cloud
• Optimize network performance for: VoIP and collaboration tools Real-time and latency-sensitive applications Multi-site and SD-WAN environments
• Lead network upgrades, enhancements, and capacity planning

Reliability, Operations & Automation

• Maintain high availability, performance, and security across hybrid infrastructure
• Manage patching, upgrades, backups, and restores
• Participate in disaster recovery planning and testing
• Improve automation and repeatability of infrastructure deployments
• Participate in a rotating on-call schedule
• Act as an escalation point during major incidents

Leadership & Collaboration

• Mentor and guide junior engineers
• Lead root cause analysis and drive long-term fixes
• Collaborate with Systems, Database, Security, and Application teams
• Create and maintain clear technical documentation and runbook

Requirements:

• Experience 5+ years in enterprise network or infrastructure engineering roles
• 3+ years hands-on experience with AWS in production environments
• Proven experience supporting hybrid on-prem + cloud architectures
• Experience in environments with: Multiple data centers 20+ sites 1,000+ endpoints
• Experience with SD-WAN technologies
• Strong background in disaster recovery and business continuity
• Technical Skills
• Strong Layer 3 networking fundamentals (TCP/IP, routing, firewalls, VPNs)
• Hands-on experience with Palo Alto firewalls
• Cisco enterprise networking experience (routing, switching, collaboration)
• Solid understanding of DNS, TLS/SSL, and identity-related protocols
• VMware virtualization experience
• Experience in healthcare or other regulated environments (HIPAA preferred)
• Epic or healthcare platform experience is a plus
• Nice to Have
• AWS Certified Solutions Architect (Associate or Professional)
• CCNP or equivalent networking certification
• Cantonese or Mandarin language skills