Senior Cloud Infrastructure Engineer (AWS & Networking)

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, HTTP/S, 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