David O.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

If your network is unstable, poorly designed, or mid-migration and nobody wants to touch it — that’s where I come in. I’m a Senior Network Engineer with 18+ years of hands-on experience rebuilding, securing, and modernizing enterprise and MSP environments. I specialize in high-risk infrastructure work where uptime matters and documentation is either outdated or nonexistent. Recent projects include: • Enterprise-wide re-IP and VLAN redesigns in healthcare environments • Migrating legacy Cisco Nexus/MPLS networks to modern Meraki and SD-WAN architectures • Designing collapsed-core networks with high availability and zero service interruption • Stabilizing environments after failed implementations or abandoned projects • Selective automation to reduce human error during high-risk changes I don’t sell theory or templates. I diagnose, design, execute, and leave systems more stable than I found them. Typical engagements: ✔ Network redesigns and cleanups ✔ Firewall and routing stabilization ✔ Office 365 / Azure AD migrations ✔ Post-breach or post-outage remediation ✔ Tier-3 / escalation support for MSPs ✔ Short-term contracts where experience matters immediately If you need someone who can step into a complex environment and make sense of it quickly, let’s talk.