David Stewart
LowFrequencyOakland.com
Oakland CA, 94607
Contact: david@lowfrequencyoakland.com
Technical Background:
·
Experience with multiple vendor carrier class
networking equipment routing and switching platforms. Vendors include Cisco
(IOS and NXOS), Cisco Meraki, Juniper, Arista, Broadcom, HPE and Dell Force10
•
Networking topology’s supported: legacy 3-tiered
border, core and aggregation with spanning tree, L2 spine leaf with MLAG or VPC
connections, L3 spine leaf with a core ASN to individual top of rack ASNs
•
BGP experience with Multi ISP BGP neighboring,
carrier private BGP neighboring, customer dedicated circuit and private BGP
neighboring environments
•
Networking security appliances Juniper 5k and 3k
clusters, Palo Alto Networks 5K and 3K, Cisco ASA and Meraki SDWAN appliances
•
Provided AWS services connectivity to Datacenter
facilities worldwide - Multiple Region, Multiple Availability zone VPC, AWS
direct connect, peering and VPN implementations
•
Extensive background with domestic and
international datacenter buildouts, facilities, intra building and intercampus
connectivity, standardization of core and aggregation cabinet designs at scale
·
Extensive work with Carrier 1, 10 and 100
gigabit ethernet (Equinix, Digital Reality and Savvis/Centurylink) hosting facilities, Letter of agency ordering
and issuing, budgeting, purchase order processing and maintenance agreement
management.
•
Unique experience with legacy to modern Active
Directory implementations
•
Strong Linux sysadmin and Proxmox
virtualization skills
•
Experience with Domain name transfer, DNS and
SMTP/IMAP/POP3 mail server administration
•
Documentation skills for runbooks and
architectural designs: Visio, Lucid charts, OmniGraffle, Wiki/Confluence and
Google apps.
•
Diverse background in research, government,
financial, BioTech and startup environments
Employment History:
Saildrone Inc., Alameda CA, 2022 –
2024 – Lead Network Engineer – R&D
Provided network engineering and
management expertise, test engineering support and communications systems QA
for the Saildrone USV (Uncrewed Surface Vehicle)
ocean research fleet.
· Developed, managed and maintained USV fleetwide global terrestrial
communications systems
· Designed and implemented a wide band solution utilizing satellite,
LTE, 5g, MANET mesh radio technologies and wifi
· Created vehicle LAN backbone standards and ip-networking
strategies
·
Supported UDP network solutions for Norbit, Teledyne
Marine and Furuno bathymetry and radar products
· Built templates and procedures for network device configurations
· Designed data transfer tests using WAN latency simulation
technologies
·
Created and
streamlined AWS S3 service solutions for client offerings like continuous data
offboarding
·
Integrated
and supported Wireguard and OpenVPN connectivity
solutions
UC Berkeley Seismology Lab CA, 2021 - 2022 -
Communications & Network Analyst
Provided support and analytics for the California public alert
earthquake sensor WAN and LAN consisting of microwave backbone and cell
networks to extremely remote sensor stations along the US Western seaboard.
·
Delivered a redundant BGP spine/leaf routing
solution for the western seaboard earthquake sensor array.
·
Scaled network connectivity to external agencies
(Army Core of Engineers, CISN etc.)
·
Utilized network automation tools to manage remote
production routers
·
Supported and streamlined fault resolution and
escalation procedures
City and County of San Francisco CA, 2020 – 2021 -
Sr. Network Engineer – Department Of Technology
Supported the network needs for all the city and county agencies.
·
Supported all EMS (Ambulance, Fire, Police, CIA,
FBI, DOJ, Dept of Health & Safety) networking needs.
·
Managed diverse collection of legacy to modern metro
comms data connections including PBX and VOIP
·
Supported ticket queue for firewall rule changes and
break fix incidents
·
Met decommissioning depreciated systems deadlines to
avoid data center fees.
·
Provided lead logistics resource for infrastructure
scaling projects
·
Deep packet analysis and troubleshooting for network
latency and packet loss
Deluxe Inc., Shoreview MN, 2016 – 2019 - Sr.
Network Engineer - Remote
Supported a carrier class West Coast data center operation at the Santa
Clara Equinix facility for a large-scale financial institution with strict
compliance requirements.
·
Executed multiple edge router migrations, core
router upgrades and migrations in West Coast data centers
·
Participated in the network hardware refresh for 35+
office relocations and acquisition integration projects
·
Provided corporate introduction to Ansible
automation tools in AWS.
·
Supported routing technologies to deliver data and
VOIP connectivity to across the continental US
·
Worked with numerous carriers to scale and maintain
the corporate MPLS network
·
Helped integrate various site infrastructures into
AWS and Deluxe Enterprise Cloud
·
Built network automation dev environment in AWS to
support testing of Ansible playbooks
·
Provided extensive analysis for corporate wide
network latency and packet loss issues
Invitae Inc., San Francisco CA, 2015
– 2016 – Sr. Network Engineer - Lab
Managed corporate and laboratory network infrastructure for Biotech DNA
sequencing campus
· Integrated asset tracking hardware
and supported LIMS networking requirements
· Implemented high bandwidth
connectivity for DNA sequencing SAN solutions
· Maintained high uptime
network for environmental sensor and sequencer connectivity
· Supported corporate campus
with redundant ISP carriers, wifi, and VPN solution
· Managed circuit upgrades and
facility DMARC operations
Pac-12 Networks, San Francisco CA, 2013 – 2015 - Sr.
Network Engineer – Broadcast Systems
Supported the live broadcast network for year around sports content
serving 12 colleges in the US Western region.
·
Automated network configuration management and
device deployment tools across all Cisco and Juniper devices.
·
Solved persistent production bottleneck issues.
· Operated as Lead Engineer for major expansion and maintenance
projects
· Supported a heterogeneous TV broadcast data network environment
and broadcast SDN WAN connections
· Designed/scaled network systems for the sports broadcast network
Lawrence Berkeley National Lab NERSC/HPC division
2007 – 2012 - Sr. Network Engineer - HPC
Supported the networking needs of a High Performance
Computing research facility through major HPC upgrade projects and HPC network
implementations.
·
Executed the front-end Network implementation for
1st open science Peta FLOP supercomputer (Cray XE6 Hopper)
·
Upgraded the data center core router and switch
infrastructure to 10Gb hardware
·
Built and supported Layer2 HPC InfiniBand networks.
·
Tested 100Gb WAN technologies between OAK and CHI
research centers
·
Increased uptime of the PDSF compute cluster by 20%
through redesigning layer2 MPI network.
·
Supported a computational systems heterogeneous
network environment (Cray XT4, Cray XE6, IBM iDataPlex)
·
Managed new integrations, scaling of bandwidth,
hardware maintenance, and security requirements
·
Evaluated alternative networking technologies making
recommendations based on cost-effectiveness and efficiency
Bittorrent Inc., San Francisco CA, 2005
– 2006 - Sr. Network Engineer
Supported a carrier class Internet dual-homed BGP production data center
environment
·
Planned and executed all Edge router
migrations/hardware upgrades
·
Managed the production Internet load balancer
systems
·
Migrated data center core layer2 network topology to
a HA configuration
·
Introduced InfiniBand based filesystem NAS
technologies
·
Operated as lead engineer for major maintenance and
storage projects
Naval Postgraduate School, Monterey CA, 2002 – 2004
– Network Engineer – NOC
Excite@Home Inc., Redwood City CA, 2001
– 2002 – Sr. Network Dev Engineer – DOCIS3.0
Navisite Inc., San Jose CA, 1998 –
2001 – Sr. Network Engineer – Data Center
Skills & Hardware
Network
*L3 protocols: TCP/IP, UDP, BGP, OSPF/IS-IS, MPLS. *L2
protocols: VPC, LACP, DHCP, VRRF, HSRP, VTP, STP, RSTP, IPX/SPX, DecNET, 802.11x trunking with
VLAN configurations, Frame-relay, T-1, 56k, DS-3, OC-3, DWDM, CWDM, metro fiber
networks, 100GB SD-WAN, *Fabric Extender FEX. *Wireless: 802.11a/b/g/n,
802.11s. *L2-3 Hardware platforms: Multi-generation Cisco platforms (legacy to Nexus),
Cisco ASA, Juniper, Lucent, Arista, Palo Alto Networks, Meraki, Cisco Wireless, APC Smart UPS. *L4-5
hardware: F5 Labs, InfoBlox. *Terrestrial communications
technologies: Starlink, Certus Iridium, Sierra
Wireless, Doodle labs OpenWRT, Silvus
MANET. *Experience with HPC network topologies: RDMA (RoCE),
InfiniBand (IB). *Network diagnostic tools: Wireshark, tcpdump, iperf, tcptrace, latency/WAN simulation technologies. *Network management and monitoring
tools: Zabbix, Cacti, RANCID, NAGIOS, MRTG, Solar Winds, SNMP v2 - 3, Netbrain,
Cisco prime, Cisco
APCI, Cisco DNAC. *Career long experience with physical plant
cabling, electrical, and HVAC systems for data centers of all sizes
System/Hardware
*Unix/Linux administration and Bash scripting skills. *Cloud,
VM and container technologies like AWS, VPC, S3, Docker, Proxmox
and VMware. *Active directory domain administration, controller
replication, Microsoft Azure integration. *Operating Systems: Linux, OSX, BSD, AIX, Solaris, HPUX, OpenWRT, Win98-11, NT4 WinServer2024. *
Server class hardware: DELL, HPE, IBM.
Software
*Automation/dev: Python, Git, Ansible, Chef, Puppet, XCAT. *Google
Desktop, MS Office, Grafana, Lucid Chart
Security and remote access technologies
*Wireguard, OpenVPN IPSEC, Cisco ASA,
ISE, Gigamon