Senior Site Reliability Engineer

John
Dansak

20 years in enterprise infrastructure — mostly at Bank of America, mostly keeping things from breaking at 2am.

Get in Touch View Resume
John Dansak

About

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, then 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, tinker with networking, and work toward certs mostly as an excuse to go deeper on topics I find interesting.

Experience

Resume

Senior Site Reliability Engineer Mar 2026 – Present
Bank of America — CFPT Production Readiness
  • Root cause analysis for production incidents involving TLS failures, WebSocket disruptions, and load balancer issues using Wireshark, Splunk, and DynaTrace APM
  • Custom scripts to automate proxy log parsing and pcap analysis, reducing time-to-resolution for connectivity incidents
  • Manages LXC container infrastructure on Proxmox for service isolation across VLAN-segmented environments
  • Works with development and infrastructure teams to fill monitoring gaps before they become incidents
Architect — APS&E Feb 2021 – May 2025
Bank of America
  • Owned architecture definitions from initial design through implementation; kept things from getting too rigid as requirements changed
  • Ran design and code reviews to validate that solutions actually matched what was being asked for
  • Worked with product management to keep the roadmap connected to what engineering could actually deliver; cleared blockers across teams
Systems Engineer — FCE Refresh & Security Mar 2017 – Apr 2022
Bank of America
  • Led refresh of 6,000+ servers and 83,000+ workstations; delivered 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 migration of legacy Perl automation codebase to PowerShell
Systems Engineer — Virtual/Windows May 2013 – Mar 2017
Bank of America
  • Administered VMware vCenter (4.x/5.x) across all cloud and legacy environments; managed DRS, Storage DRS, HA, and Resource Pools across all lines of business
  • Remote Break/Fix support for 20,000+ servers (IBM, HP, Dell) running Windows 2003–2012 and ESXi 3.5–5.5 across all BofA/Merrill Lynch data centers
  • Automated deployments and QA checks across Windows and ESX environments; collected compliance artifacts for audit
Systems Engineer — Retail Operations 2003 – 2013
Bank of America
  • Day-to-day operations for 6,000+ retail financial centers: 6,500 servers, 83,000 workstations, and 15,000 printers
  • Built and maintained mobile centers for disaster recovery; executed rapid deployments after natural disasters nationwide
Senior Network Consultant 2001 – 2003
Creative Solutions
  • Assessed client networks, found the problems they didn't know they had, and implemented the fixes
  • Day-to-day support and hands-on tech work for small and mid-size businesses

Skills & Technologies

SRE / Reliability
SLO/SLI/SLA Incident Management Observability Post-mortems Change Management
Cloud & Infrastructure
Microsoft Azure VMware vSphere/ESXi LXC Containers Red Hat Linux Linux Windows Server Proxmox
Networking
TCP/IPv4 DNS / DHCP VPN Cisco Routing & Switching Wireshark
Automation & Monitoring
PowerShell Python DynaTrace Splunk ITIL / ITSM

Certifications

  • CompTIA Security+
  • eJPT
  • Microsoft AZ-900
  • Microsoft AZ-104
  • CCNA Route/Switch
  • RHCSA
  • VMware VCP 5.5
  • Windows NT/2000/2003 MCSE

Education

  • Southern College of Technology
    Marietta, GA · 1997–1998

Blog

Writing

View all posts →

Contact

Get in Touch

[email protected] LinkedIn Telegram