John Dansak
John Dansak
Senior Site Reliability Engineer · Marietta / Atlanta, GA
[email protected]

Background

I’ve spent most of my career at Bank of America, working through just about every layer of the infrastructure stack. Early on that meant keeping 83,000 workstations and 6,500 servers running across 6,000+ retail branches. Later it was VMware at scale across 20,000+ data center servers, then enterprise architecture work, and now I’m back in hands-on SRE — diagnosing production incidents, building tooling, and finding the things that are quietly about to break.

Outside of work I run a homelab on Proxmox, automate Linux and macOS setups with Ansible, build local AI inference systems on AMD Strix Halo hardware, and work toward certifications as an excuse to go deeper on topics I find interesting.


Experience

Senior Site Reliability Engineer

Bank of America — CFPT Production Readiness · Mar 2026 – Present

  • Root cause analysis for production incidents involving TLS failures, WebSocket disruptions, and load balancer issues using Wireshark, Splunk, and Dynatrace APM.
  • Build custom scripts to automate proxy log parsing and packet capture (pcap) analysis, reducing time-to-resolution for connectivity incidents.
  • Manage LXC container infrastructure on Proxmox for service isolation across VLAN-segmented environments.
  • Partner with development and infrastructure teams to close monitoring and alerting gaps before they become incidents.

Architect — APS&E

Bank of America · Feb 2021 – May 2025

  • Owned architecture definitions from initial design through implementation, keeping designs adaptable as requirements changed.
  • Ran design and code reviews to validate that engineering solutions matched operational and business requirements.
  • Worked with product management to keep the roadmap connected to what engineering could realistically deliver and cleared blockers across teams.

Systems Engineer — FCE Refresh & Security

Bank of America · Mar 2017 – Apr 2022

  • Led the hardware and OS refresh of 6,000+ servers and 83,000+ workstations across the retail branch footprint, delivering a 3-year project on time with a 5-engineer team.
  • Owned all security audit findings for the retail space; partnered with audit teams to identify and remediate vulnerabilities.
  • Led the migration of a legacy Perl automation codebase to PowerShell.

Systems Engineer — Virtual / Windows

Bank of America · May 2013 – Mar 2017

  • Administered VMware vCenter (4.x/5.x) across cloud and legacy environments; managed DRS, Storage DRS, HA, and Resource Pools across all lines of business.
  • Provided remote Break/Fix support for 20,000+ servers (IBM, HP, Dell) running Windows Server 2003–2012 and ESXi 3.5–5.5 across all Bank of America and Merrill Lynch data centers.
  • Automated deployments and QA checks across Windows and ESX environments and collected compliance artifacts for audit.

Systems Engineer — Retail Operations

Bank of America · 2003 – 2013

  • Day-to-day operations for 6,000+ retail financial centers: 6,500 servers, 83,000 workstations, and 15,000 printers.
  • Built and maintained mobile financial centers for disaster recovery, executing rapid field deployments nationwide after natural disasters.

Senior Network Consultant

Creative Solutions · 2001 – 2003

  • Assessed client networks, uncovered latent routing and infrastructure issues, and implemented permanent fixes.
  • Provided day-to-day support and hands-on systems engineering for small and mid-size businesses.

Skills & Technologies

DomainTechnologies & Practices
SRE & ReliabilitySLO / SLI / SLA, Incident Management, Observability, Post-mortems, Change Management
Cloud & InfrastructureRed Hat Enterprise Linux, Ubuntu / Debian, Proxmox VE, LXC Containers, Docker, VMware vSphere / ESXi, Microsoft Azure, Windows Server
NetworkingTCP/IPv4, TLS Inspection, Wireshark / pcap, DNS / DHCP, VPN / Tailscale, Cisco Routing & Switching
Automation & MonitoringAnsible, Python, PowerShell, Bash, Splunk Enterprise, Dynatrace APM, ITIL / ITSM

Certifications

  • Red Hat Certified System Administrator (RHCSA)
  • CompTIA Security+
  • eJPT (eLearnSecurity Junior Penetration Tester)
  • Microsoft Certified: Azure Administrator (AZ-104)
  • Microsoft Certified: Azure Fundamentals (AZ-900)
  • Cisco CCNA Route/Switch
  • VMware VCP 5.5
  • Windows NT/2000/2003 MCSE

Education

Southern College of Technology (Marietta, GA · 1997–1998)